Carroll County, MD — Planting Guide
Carroll County is in USDA Zone 7a. The average last spring frost is April 17 and the first fall frost is October 26, giving you a growing season of approximately 192 days.
At an elevation of 715 ft, Carroll County receives approximately 42.1 in of rainfall annually. Summer highs average 87°F with winter lows around 20°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 34 days year to year — ranging from April 5 in warm years to May 9 in cold years. The growing season is trending longer by about 1.89 days per decade. Carroll County scores 63/100 (Good) on the Microclimate Index.
🌡️ Zone
7a (0°F to 5°F min)
❄️ Last Frost
April 17
🍂 First Frost
October 26
📅 Growing Season
192 days
⛰️ Elevation
715 ft
🌧️ Annual Rainfall
42.1 in
Monthly Watering Calendar for Carroll County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
What this means for you: Mulch reduces watering needs 30-50% by cutting evaporation. Carroll County's 42" annual rainfall might be enough for vegetables in some months and not in others — a 2-3" mulch layer evens the swing.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 3.2 in | 9 days | — | None |
| Feb | 2.7 in | 10 days | — | None |
| Mar | 3.3 in | 12 days | 1 in | Moderate |
| Apr | 3.9 in | 10 days | 0.4 in | Low |
| May | 3.8 in | 12 days | 0.5 in | Low |
| Jun | 3.7 in | 9 days | 0.6 in | Moderate |
| Jul | 4.6 in | 10 days | — | Low |
| Aug | 3.5 in | 8 days | 0.8 in | Moderate |
| Sep | 3.2 in | 9 days | 1.1 in | Moderate |
| Oct | 3.3 in | 10 days | 1 in | Moderate |
| Nov | 3.4 in | 11 days | — | None |
| Dec | 3.5 in | 11 days | — | None |
Annual total: 42.1 in. Water needs vary by crop — tomatoes need ~1.2"/week while herbs like rosemary need only 0.3"/week. Check individual plant pages for crop-specific water budgets that factor in your county's rainfall and soil drainage.
Carroll County Soil Profile
Soil Type
Silt Loam
Soil pH
5.6-6.5
Drainage
Well Drained
Frost Risk Probability
Based on 31 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | May 9 | Nov 6 | 181 days |
| Cautious | Apr 24 | Oct 31 | 190 days |
| Average year | Apr 17 | Oct 26 | 192 days |
| Optimistic | Apr 13 | Oct 18 | 188 days |
| Aggressive (risky) | Apr 5 | Oct 10 | 188 days |
Not very — frost dates can vary by ±34 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Yes — growing seasons are getting longer here (about 1.9 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Carroll County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Carroll County
Free expert help is closer than you think. Your county's cooperative extension office connects you with trained gardeners, soil testing labs, and local programs — all specific to Carroll County's climate and soil.
County Extension Office
Carroll County University of Maryland Extension Extension Office
Phone: 301-405-2072
Visit Extension Office Website →
Extension offices are run by land-grant universities and funded by the USDA. Their advice is free, research-based, and tailored to your county's specific conditions.
Master Gardener Program
Free gardening help from trained volunteers
Master Gardeners are community volunteers who complete 40–60 hours of university horticultural training. They answer gardening questions, diagnose plant problems, and offer workshops — all free.
Many extension offices run a Master Gardener hotline where you can call or email with photos of plant problems for free diagnosis.
Soil Testing
Available through your extension office
Before amending your soil, get it tested. Your extension office offers soil testing (typically $10–$25) that tells you exact pH, nutrient levels, and amendment recommendations specific to what you want to grow.
Services Available in Carroll County
Finding local nurseries & garden centers in Carroll County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Carroll County's soil and climate that big-box stores can't. Plants from local growers are typically hardier because they're already acclimated to your zone.
How to Find Them
Search for "nurseries near Carroll County MD" or "garden center Carroll County" on Google Maps. Also check with your extension office — they often maintain lists of reputable local nurseries and plant sales.
Community gardens & gardening groups
Community gardens are a great way to learn from experienced gardeners in your area, especially if you're limited on space. Search "community garden Carroll County MD" or check your extension office and local parks department. Facebook groups like "Carroll County Gardeners" or "Maryland Gardening" are also excellent for local advice and plant swaps.
What to Plant After Your Harvest
After your first crops finish, use the remaining frost-free days to grow a second round.
Show 6 more succession options
Sunlight & Day Length in Carroll County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
What this means for you: Plants use day length as their seasonal clock. Some crops flower when days lengthen (most flowers), some when days shorten (chrysanthemums, soybeans). Carroll County's curve is the timing layer beneath everything you grow.
Longest Day
14.8 hours
Summer solstice daylight
Shortest Day
9.2 hours
Winter solstice daylight
Peak Sun Hours
8.6 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 9.5 hr | 3.7 hr | Short day |
| February | 10.5 hr | 4.2 hr | Short day |
| March | 11.7 hr | 5.2 hr | Short day |
| April | 13 hr | 6.4 hr | Neutral |
| May | 14.2 hr | 7.2 hr | Long day |
| June | 14.8 hr | 8.5 hr | Long day |
| July | 14.5 hr | 8.6 hr | Long day |
| August | 13.6 hr | 7.3 hr | Neutral |
| September | 12.2 hr | 6.3 hr | Neutral |
| October | 10.9 hr | 5.4 hr | Short day |
| November | 9.8 hr | 3.6 hr | Short day |
| December | 9.2 hr | 3.1 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Carroll County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Why this matters: Mulched soil swings less. The mulch insulates against both winter cold and summer heat. In Carroll County, an aggressive mulch program shifts your effective soil temperature curve toward optimal for most crops.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from May through Oct.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
7 months
Solid season. Piles go dormant in winter.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 32°F | 38°F | ❄️ Dormant | ~36 weeks |
| Feb | 32°F | 39°F | ❄️ Dormant | ~36 weeks |
| Mar | 39°F | 44°F | ❄️ Dormant | ~36 weeks |
| Apr | 52°F | 50°F | ♻️ Active | ~14 weeks |
| May | 63°F | 61°F | ♻️ Active | ~14 weeks |
| Jun | 73°F | 68°F | 🔥 Peak | ~8 weeks |
| Jul | 82°F | 76°F | 🔥 Peak | ~8 weeks |
| Aug | 81°F | 77°F | 🔥 Peak | ~8 weeks |
| Sep | 74°F | 74°F | 🔥 Peak | ~8 weeks |
| Oct | 62°F | 67°F | ♻️ Active | ~14 weeks |
| Nov | 50°F | 56°F | 🐢 Slow | ~24 weeks |
| Dec | 39°F | 45°F | ❄️ Dormant | ~36 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Carroll County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
The practical takeaway: Pest pressure scales with warmth and humidity. Hot humid Carroll County sees year-round bugs and fungal disease; cold dry regions see almost none. A high pest score means crop rotation, resistant varieties, and a weekly pest-watch routine from day one.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Moderate — watch for mildew and blight during wet periods.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | Apr, May, Jun, Jul, Aug, Sep |
| Japanese beetles | High | Jun, Jul, Aug |
| Squash vine borers | Moderate | Jun, Jul |
| Tomato hornworms | Moderate | Jun, Jul, Aug |
| Cucumber beetles | Moderate | May, Jun, Jul |
| Stink bugs | Low | Jun, Jul, Aug, Sep |
Organic pest management tips
- Use row covers on susceptible crops during peak pest months
- Apply neem oil preventatively every 7-14 days during active pest season
- Interplant with strong-scented herbs (basil, marigold) to confuse pests
- Hand-pick larger pests (beetles, caterpillars) in early morning when they're sluggish
- Practice crop rotation — never plant the same family in the same spot within 3 years
Cover Crops for Carroll County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
For new gardeners: Bare soil is wasted soil — it loses nutrients to rain, dries out, compacts, and gets taken over by weeds. Cover crops (clovers, ryegrass, vetch, peas) are the "between seasons" trick that makes soil better every year. In Carroll County, you can fit a cover crop into the gaps.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 20 | Aug 31 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 27 | Aug 17 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 21 | Aug 17 | ✓ Yes | Living mulch, fixes nitrogen, permanent ground cover |
Summer Cover Crops (1 options) — Fill gaps and suppress weeds between plantings
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Sunflowers | May 18 | Oct 12 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (7 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 27 | Mar 27 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 26 | Apr 3 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 12 | Mar 27 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 16 | Apr 3 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 16 | Mar 27 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 30 | Mar 27 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 29 | Mar 27 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Carroll County
Why this matters: Plants lose water through tiny leaf pores. Wind accelerates that loss dramatically — a 15 mph day can double a calm day's irrigation need. Carroll County's 10.2 mph background wind is something to design around, not against. Windbreaks made of perennial shrubs save more water than any drip system.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 16 mph Summer: 10 mph
Fall: 11 mph Winter: 17 mph
Prevailing wind: W. Windy area — plant a windbreak hedge on the W side of your garden.
Windbreak Benefit
6.8/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (369 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Carroll County
How much water you can collect, when to collect it, and what size system you need for your garden.
What this means for you: Rainwater scales linearly with roof area. A 2,000 sq ft roof in Carroll County captures ~1,200 gallons per 1" of rain — given 42" annual rainfall, that's thousands of gallons a year if you have storage to hold it.
Annual Collection
20,982 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
6 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 750 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Apr, May, Jun, Jul
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Feb, Sep
Dry months when you'll rely on stored water — size your storage for this gap.
Rainwater collection tips for your area
- Your county receives approximately 42.1 inches of rain per year
- A 1,000 sq ft roof can collect roughly 20,982 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Jan, Feb, Sep)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Carroll County
Soil Type
Silt Loam
Soil pH 5.6–6.5 · Moderately Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
Watering Needs
Drought stress: 3.5/10
Low-to-moderate drought stress. Plan to water 1–2 times per week during peak summer. (42.1 in. annual rainfall)
Season Tips
192-day frost-free season
Plenty of time for warm-season crops. Start heat-lovers indoors 6–8 weeks before last frost to maximise your harvest window.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 22-page printable includes your zone's planting calendar, a month-by-month task list, a seed inventory tracker, a harvest log, and succession-planting charts. Built to print, write in, and actually use all season.
Recommended for Your Garden
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
Boost soil fertility and structure with rich, well-aged organic compost.
🥬 Vegetables to Grow in Carroll County
112 vegetables that grow well in Zone 7a with planting dates for Carroll County.
Show all 112 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 20 | Apr 24 | May 1 | — | Jul 24 – Aug 28 | 80–100 |
| Amaranth | Feb 27 | Apr 24 | May 1 | — | Jul 31 – Sep 18 | 90–120 |
| Artichoke | — | — | May 1 | — | Sep 4 – Nov 13 | 120–180 |
| Arugula | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 22 – Jul 24 | 30–50 |
| Asparagus | — | — | May 1 | — | — | 730–1095 |
| Beets | — | Apr 3 | — | Aug 17 | May 29 – Jun 26 | 50–70 |
| Belgian Endive | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Aug 7 – Oct 2 | 110–150 |
| Bitter Melon | Feb 27 | Apr 24 | May 1 | — | Jul 3 – Aug 14 | 60–90 |
| Black Beans | — | Apr 24 | — | — | Jul 24 – Sep 11 | 90–120 |
| Bok Choy | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 29 – Jul 3 | 40–60 |
| Broccoli | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 19 – Jul 31 | 60–90 |
| Broccoli Rabe | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 29 – Jul 3 | 40–60 |
| Brussels Sprouts | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 17 – Sep 11 | 90–130 |
| Butternut Squash | Mar 20 | Apr 24 | May 1 | — | Jul 31 – Sep 4 | 85–110 |
| Cabbage | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 19 – Aug 14 | 60–100 |
| Calabash | Feb 27 | Apr 24 | May 1 | — | Jul 24 – Sep 18 | 80–120 |
| Cardoon | — | — | May 1 | — | Sep 4 – Oct 16 | 120–150 |
| Carrots | — | Apr 3 | — | Aug 17 | Jun 5 – Jul 10 | 60–80 |
| Cauliflower | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Aug 14 | 55–100 |
| Celeriac | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 31 – Sep 4 | 100–120 |
| Celery | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 10 – Sep 4 | 80–120 |
| Celtuce | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 19 – Jul 31 | 60–90 |
| Chard | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Jul 31 | 50–60 |
| Chayote | Feb 27 | Apr 24 | May 1 | — | Sep 4 – Nov 13 | 120–180 |
| Chickpeas | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 10 – Aug 21 | 80–110 |
| Chicory | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 19 – Jul 31 | 60–85 |
| Chinese Cabbage | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Jul 10 | 50–70 |
| Christmas Lima Beans | Feb 27 | Apr 24 | May 1 | — | Jul 24 – Aug 28 | 80–100 |
| Collard Greens | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Aug 14 | 55–75 |
| Corn | — | Apr 24 | — | — | Jun 26 – Aug 21 | 60–100 |
| Cowpeas | — | Apr 24 | — | — | Jun 26 – Aug 7 | 60–90 |
| Cress | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 1 – May 22 | 14–21 |
| Crookneck Squash | Mar 20 | Apr 24 | May 1 | — | Jun 19 – Jul 17 | 45–60 |
| Crosne | — | Apr 3 | — | Aug 17 | Sep 4 – Nov 6 | 150–200 |
| Cucumber | Mar 20 | Apr 24 | May 1 | — | Jun 26 – Aug 21 | 50–70 |
| Daikon | — | Apr 3 | — | Aug 17 | May 29 – Jun 26 | 50–70 |
| Delicata Squash | Mar 20 | Apr 24 | May 1 | — | Jul 24 – Aug 28 | 80–100 |
| Edamame | — | Apr 24 | — | — | Jul 10 – Aug 21 | 75–100 |
| Eggplant | Feb 13 | Apr 24 | May 1 | — | Jul 10 – Sep 11 | 65–85 |
| Endive | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 5 – Jul 10 | 45–65 |
| Escarole | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Jul 10 | 50–70 |
| Fava Beans | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 3 – Aug 14 | 75–100 |
| Fennel | Feb 27 | Apr 24 | May 1 | — | Jul 3 – Aug 14 | 60–90 |
| Garlic | — | — | — | Sep 14 | Dec 14 – Apr 26 | 90–240 |
| Green Beans | — | Apr 24 | — | — | Jun 19 – Aug 14 | 50–65 |
| Horseradish | — | — | May 1 | — | Sep 4 – Nov 13 | 120–180 |
| Hot Peppers | Feb 13 | Apr 24 | May 1 | — | Jul 10 – Oct 16 | 70–120 |
| Hubbard Squash | Mar 20 | Apr 24 | May 1 | — | Aug 14 – Sep 18 | 100–120 |
| Jicama | Feb 27 | Apr 24 | May 1 | — | Sep 4 – Nov 13 | 120–180 |
| Kabocha | Mar 20 | Apr 24 | May 1 | — | Jul 31 – Aug 28 | 85–100 |
| Kai Lan | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 5 – Jul 3 | 45–60 |
| Kale | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Aug 7 | 50–70 |
| Kidney Beans | — | Apr 24 | — | — | Jul 24 – Aug 28 | 85–110 |
| Kohlrabi | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 5 – Jul 10 | 45–65 |
| Komatsuna | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 22 – Jun 26 | 35–50 |
| Leeks | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 17 – Oct 2 | 90–150 |
| Lentils | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 10 – Aug 21 | 80–110 |
| Lettuce | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 22 – Jul 31 | 30–60 |
| Lima Beans | — | Apr 24 | — | — | Jun 26 – Aug 7 | 60–90 |
| Loofah | Feb 27 | Apr 24 | May 1 | — | Aug 14 – Oct 16 | 100–150 |
| Luffa | Feb 27 | Apr 24 | May 1 | — | Jul 31 – Oct 16 | 90–150 |
| Mache | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 29 – Jul 3 | 40–60 |
| Malabar Spinach | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Jul 24 | 55–70 |
| Melon | Mar 20 | Apr 24 | May 1 | — | Jul 10 – Aug 28 | 70–100 |
| Microgreens | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Apr 24 – May 22 | 7–21 |
| Mitsuba | Mar 13 | Apr 3 | Apr 10 | Aug 17 | Jun 5 – Jul 31 | 50–70 |
| Mizuna | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 22 – Jun 19 | 30–45 |
| Mustard Greens | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 22 – Jul 24 | 30–50 |
| Napa Cabbage | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Jul 17 | 55–75 |
| New Zealand Spinach | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Jul 24 | 55–70 |
| Okra | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Aug 21 | 50–65 |
| Onion | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 17 – Sep 4 | 90–120 |
| Pac Choi | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 29 – Jun 26 | 40–55 |
| Parsnip | — | Apr 3 | — | Aug 17 | Jul 17 – Aug 28 | 100–130 |
| Patty Pan Squash | Mar 20 | Apr 24 | May 1 | — | Jun 19 – Jul 17 | 45–60 |
| Peas | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Aug 7 | 55–70 |
| Peppers | Feb 13 | Apr 24 | May 1 | — | Jul 3 – Sep 11 | 60–90 |
| Pole Beans | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Aug 21 | 55–70 |
| Potatoes | Feb 27 | Apr 24 | May 1 | — | Jul 10 – Sep 18 | 70–120 |
| Pumpkin | Mar 20 | Apr 24 | May 1 | — | Jul 31 – Sep 18 | 85–120 |
| Purslane | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 29 – Jul 3 | 40–60 |
| Radicchio | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 19 – Jul 24 | 60–80 |
| Radish | — | Apr 3 | — | Aug 17 | May 1 – May 22 | 22–35 |
| Rhubarb | — | — | May 8 | — | — | 365–730 |
| Romanesco | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 3 – Aug 14 | 75–100 |
| Rutabaga | — | Apr 3 | — | Aug 17 | Jun 26 – Jul 31 | 80–100 |
| Salsify | — | Apr 3 | — | Aug 17 | Jul 17 – Aug 28 | 100–130 |
| Savoy Cabbage | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 26 – Aug 21 | 70–110 |
| Scallions | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Jul 10 | 50–70 |
| Scarlet Runner Beans | Feb 27 | Apr 24 | May 1 | — | Jul 3 – Aug 7 | 60–80 |
| Shallot | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jul 17 – Sep 4 | 90–120 |
| Shiso | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Aug 21 | 50–70 |
| Snap Peas | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Aug 21 | 55–70 |
| Snow Peas | Mar 13 | Apr 3 | Apr 17 | Aug 17 | Jun 12 – Aug 7 | 50–65 |
| Soybeans | — | Apr 24 | — | — | Jul 17 – Sep 11 | 80–120 |
| Spaghetti Squash | Mar 20 | Apr 24 | May 1 | — | Jul 31 – Aug 28 | 85–100 |
| Spinach | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 22 – Jul 24 | 35–50 |
| Squash (Summer) | Mar 20 | Apr 24 | May 1 | — | Jun 19 – Aug 21 | 45–65 |
| Squash (Winter) | Mar 20 | Apr 24 | May 1 | — | Jul 24 – Sep 18 | 80–120 |
| Sunchoke | — | — | May 1 | — | Aug 21 – Oct 16 | 110–150 |
| Sweet Corn | — | Apr 24 | — | — | Jun 26 – Aug 7 | 60–90 |
| Sweet Potatoes | Feb 27 | Apr 24 | May 1 | — | Jul 31 – Sep 18 | 90–120 |
| Tatsoi | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 22 – Jun 26 | 35–50 |
| Tomatillo | Feb 27 | Apr 24 | May 1 | — | Jul 3 – Sep 11 | 60–85 |
| Tomatoes | Feb 27 | Apr 24 | May 1 | — | Jul 3 – Sep 11 | 60–85 |
| Turnip | — | Apr 3 | — | Aug 17 | May 15 – Jun 19 | 40–60 |
| Watercress | Mar 13 | Apr 3 | Apr 17 | Aug 17 | May 29 – Jul 3 | 40–60 |
| Watermelon | Mar 20 | Apr 24 | May 1 | — | Jul 10 – Aug 28 | 70–100 |
| Wax Beans | — | Apr 24 | — | — | Jun 19 – Aug 14 | 50–65 |
| Winter Melon | Feb 27 | Apr 24 | May 1 | — | Jul 31 – Sep 18 | 90–120 |
| Yard Long Beans | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Aug 7 | 55–80 |
| Zucchini | Mar 20 | Apr 24 | May 1 | — | Jun 19 – Aug 14 | 45–60 |
🍓 Fruits to Grow in Carroll County
31 fruits that grow well in Zone 7a with planting dates for Carroll County.
Show all 31 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 8 | — | Aug 7 – Nov 20 | 90–180 |
| Aronia | — | — | May 8 | — | — | 730–1095 |
| Blackberries | — | — | May 8 | — | — | 365–730 |
| Blueberries | — | — | May 8 | — | — | 730–1095 |
| Boysenberries | — | — | May 8 | — | — | 365–730 |
| Cantaloupe | — | — | May 8 | — | Jul 17 – Aug 21 | 70–90 |
| Che Fruit | — | — | May 8 | — | — | 1095–1825 |
| Cranberries | — | — | May 8 | — | — | 730–1095 |
| Currants | — | — | May 8 | — | — | 730–1095 |
| Elderberries | — | — | May 8 | — | — | 730–1095 |
| Figs | — | — | May 8 | — | — | 730–1825 |
| Goji Berries | — | — | May 8 | — | — | 730–1095 |
| Gooseberries | — | — | May 8 | — | — | 730–1095 |
| Grapes | — | — | May 8 | — | — | 730–1095 |
| Ground Cherry | — | — | May 8 | — | Jul 17 – Sep 11 | 65–80 |
| Hardy Kiwi | — | — | May 8 | — | — | 1095–1825 |
| Haskaps | — | — | May 8 | — | — | 730–1095 |
| Honeydew | — | — | May 8 | — | Jul 31 – Sep 11 | 80–110 |
| Jostaberry | — | — | May 8 | — | — | 730–1095 |
| Kiwi | — | — | May 8 | — | — | 1095–1825 |
| Lingonberries | — | — | May 8 | — | — | 730–1095 |
| Loquat | — | — | May 8 | — | — | 730–1825 |
| Medlar | — | — | May 8 | — | — | 1095–1825 |
| Mulberries | — | — | May 8 | — | — | 730–1825 |
| Pawpaw | — | — | May 8 | — | — | 1095–2555 |
| Persimmon | — | — | May 8 | — | — | 1095–2555 |
| Pomegranate | — | — | May 8 | — | — | 730–1095 |
| Quince | — | — | May 8 | — | — | 1095–1825 |
| Raspberries | — | — | May 8 | — | — | 365–730 |
| Serviceberries | — | — | May 8 | — | — | 730–1095 |
| Strawberries | — | — | May 8 | — | Aug 7 – Dec 18 | 90–365 |
🌿 Herbs to Grow in Carroll County
36 herbs that grow well in Zone 7a with planting dates for Carroll County.
Show all 36 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 13 | Apr 3 | Apr 10 | Aug 17 | — | 365–730 |
| Anise | Mar 13 | Apr 3 | Apr 10 | Aug 17 | Jul 10 – Sep 25 | 90–120 |
| Basil | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Aug 28 | 50–75 |
| Bee Balm | — | — | Apr 24 | — | Jul 24 – Oct 9 | 90–120 |
| Borage | Mar 13 | Apr 3 | Apr 10 | Aug 17 | Jun 5 – Jul 24 | 50–60 |
| Caraway | Mar 13 | Apr 3 | Apr 10 | Aug 17 | — | 365–450 |
| Catnip | — | — | Apr 24 | — | Jun 26 – Aug 28 | 60–80 |
| Chamomile | Mar 13 | Apr 3 | Apr 10 | Aug 17 | Jun 12 – Aug 21 | 60–90 |
| Chervil | Mar 13 | Apr 3 | Apr 10 | Aug 17 | May 22 – Jul 24 | 40–60 |
| Chives | — | — | Apr 24 | — | Jun 26 – Sep 4 | 60–90 |
| Cilantro | Mar 13 | Apr 3 | Apr 10 | Aug 17 | May 22 – Jul 24 | 40–60 |
| Comfrey | — | — | Apr 24 | — | Jun 26 – Sep 4 | 60–90 |
| Cumin | Mar 13 | Apr 3 | Apr 10 | Aug 17 | Jul 24 – Sep 25 | 100–120 |
| Dill | Mar 13 | Apr 3 | Apr 10 | Aug 17 | May 22 – Jul 24 | 40–60 |
| Epazote | Feb 27 | Apr 24 | May 1 | — | Jun 19 – Aug 14 | 45–60 |
| Fennel (herb) | Mar 13 | Apr 3 | Apr 10 | Aug 17 | Jun 12 – Aug 21 | 60–90 |
| Feverfew | — | — | Apr 24 | — | Jul 24 – Oct 9 | 90–120 |
| Garlic Chives | — | — | Apr 24 | — | Jun 26 – Sep 4 | 60–90 |
| Horehound | — | — | Apr 24 | — | Jul 10 – Sep 4 | 75–90 |
| Hyssop | — | — | Apr 24 | — | Jul 3 – Sep 4 | 70–90 |
| Lemon Balm | — | — | Apr 24 | — | Jun 26 – Aug 14 | 60–70 |
| Lemon Thyme | — | — | Apr 24 | — | Jul 3 – Sep 4 | 70–90 |
| Lovage | — | — | Apr 24 | — | Jul 3 – Sep 4 | 70–90 |
| Marjoram | — | — | Apr 24 | — | Jun 26 – Sep 4 | 60–90 |
| Mint | — | — | Apr 24 | — | Jun 26 – Sep 4 | 60–90 |
| Oregano | — | — | Apr 24 | — | Jun 26 – Sep 4 | 60–90 |
| Parsley | Mar 13 | Apr 3 | Apr 10 | Aug 17 | Jun 12 – Aug 14 | 60–80 |
| Rosemary | — | — | Apr 24 | — | Jul 17 – Dec 4 | 80–180 |
| Rue | — | — | Apr 24 | — | Jul 3 – Sep 4 | 70–90 |
| Sage | — | — | Apr 24 | — | Jul 10 – Sep 4 | 75–90 |
| Savory | — | — | Apr 24 | — | Jun 19 – Aug 14 | 50–70 |
| Sorrel | Mar 13 | Apr 3 | Apr 10 | Aug 17 | May 22 – Jul 24 | 40–60 |
| Tarragon | — | — | Apr 24 | — | Jun 26 – Sep 4 | 60–90 |
| Thai Basil | Feb 27 | Apr 24 | May 1 | — | Jun 26 – Aug 28 | 50–75 |
| Thyme | — | — | Apr 24 | — | Jul 3 – Sep 4 | 70–90 |
| Valerian | — | — | Apr 24 | — | Aug 28 – Dec 4 | 120–180 |
🌸 Flowers to Grow in Carroll County
53 flowers that grow well in Zone 7a with planting dates for Carroll County.
Show all 53 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 6 | Apr 17 | Apr 17 | — | Jun 12 – Oct 2 | 60–75 |
| Alliums | — | — | — | Sep 21 | Oct 19 – Nov 9 | 28–42 |
| Anemones | — | — | — | Aug 31 | Sep 14 – Oct 12 | 90–120 |
| Astilbe | Feb 13 | — | Apr 24 | — | Jul 3 – Aug 28 | 70–100 |
| Bachelor's Button | Mar 6 | Mar 13 | Apr 17 | Aug 31 | Jun 19 – Sep 18 | 60–90 |
| Begonias | Feb 6 | — | Apr 17 | — | Jun 26 – Oct 16 | 70–90 |
| Black-eyed Susan | Feb 13 | Apr 17 | Apr 24 | — | Jul 3 – Nov 6 | 60–80 |
| Bleeding Hearts | Feb 13 | — | Apr 24 | — | Jun 12 – Jul 17 | 60–90 |
| Calendula | Mar 6 | Mar 13 | Apr 17 | Aug 31 | Jun 5 – Sep 18 | 50–70 |
| California Poppy | — | Mar 20 | — | Aug 31 | May 29 – Aug 7 | 60–90 |
| Celosia | Mar 20 | Apr 17 | Apr 17 | — | Jun 19 – Oct 16 | 60–90 |
| Columbine | Feb 20 | Apr 24 | Apr 24 | — | Jun 12 – Jul 17 | 70–100 |
| Coreopsis | Feb 13 | Apr 17 | Apr 24 | — | Jun 26 – Nov 6 | 60–80 |
| Cosmos | Mar 20 | Apr 17 | Apr 17 | — | Jun 26 – Oct 16 | 60–90 |
| Crocus | — | — | — | Sep 21 | Aug 17 – Sep 7 | 10–20 |
| Daffodils | — | — | — | Sep 21 | Aug 24 – Sep 14 | 20–40 |
| Dahlias | Mar 20 | Apr 24 | Apr 24 | — | Jul 3 – Nov 6 | 70–120 |
| Daylily | Feb 13 | — | Apr 24 | — | Jul 3 – Nov 6 | 60–90 |
| Dianthus | Feb 20 | Mar 13 | Mar 27 | — | May 15 – Aug 14 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 13 | Apr 24 | Apr 24 | — | Jul 10 – Nov 6 | 70–90 |
| Foxglove | Feb 20 | Apr 24 | Apr 24 | — | Jun 12 – Jul 17 | 80–120 |
| Gaillardia (Blanket Flower) | Feb 27 | Apr 24 | Apr 24 | — | Jul 3 – Nov 20 | 70–100 |
| Geraniums | Feb 6 | — | Apr 17 | — | Jun 26 – Oct 16 | 70–100 |
| Gladiolus | — | Apr 17 | Apr 17 | — | Jun 26 – Oct 30 | 70–100 |
| Hostas | Feb 6 | — | Apr 24 | — | Jul 3 – Nov 6 | 60–90 |
| Hyacinths | — | — | — | Sep 21 | Sep 14 – Oct 5 | 14–28 |
| Hydrangeas | Feb 6 | — | Apr 24 | — | Jul 3 – Oct 23 | 90–150 |
| Impatiens | Feb 20 | — | Apr 24 | — | Jul 3 – Oct 23 | 60–75 |
| Irises | — | Division | Apr 24 | — | Jun 12 – Jul 17 | 60–100 |
| Larkspur | — | Mar 20 | — | Aug 17 | May 29 – Aug 7 | 60–90 |
| Lavender | Feb 13 | — | May 1 | — | Jul 10 – Sep 18 | 90–120 |
| Lilies | — | Division | Apr 24 | — | Jul 3 – Oct 23 | 70–120 |
| Lobelia | Feb 13 | — | Mar 27 | — | May 22 – Aug 14 | 70–80 |
| Lupine | Feb 20 | Apr 24 | Apr 24 | — | Jun 12 – Jul 17 | 75–100 |
| Marigolds | Mar 6 | Apr 17 | Apr 17 | — | Jun 12 – Sep 18 | 50–70 |
| Nasturtium | Mar 20 | Apr 17 | Apr 17 | — | Jun 12 – Oct 16 | 55–65 |
| Pansy | Feb 6 | — | Apr 17 | Aug 17 | Jun 12 – Aug 21 | 70–90 |
| Peonies | — | Division | Apr 24 | — | Jun 19 – Jul 24 | 90–120 |
| Petunia | Feb 20 | — | Apr 24 | — | Jul 3 – Oct 23 | 70–90 |
| Phlox | Feb 13 | Apr 24 | Apr 24 | — | Jul 3 – Sep 25 | 80–110 |
| Portulaca | Mar 20 | Apr 17 | Apr 17 | — | Jun 5 – Oct 2 | 50–70 |
| Ranunculus | — | — | — | Aug 31 | Sep 28 – Oct 26 | 90–120 |
| Roses | Feb 6 | — | Apr 24 | — | Jul 3 – Nov 6 | 90–180 |
| Salvia | Feb 20 | — | Apr 17 | — | Jun 26 – Oct 16 | 70–90 |
| Sedum (Stonecrop) | Feb 13 | — | Apr 24 | — | Aug 14 – Nov 6 | 60–90 |
| Snapdragon | Feb 6 | Mar 20 | Apr 17 | Aug 31 | Jun 26 – Sep 18 | 70–100 |
| Sunflower | Mar 27 | Apr 17 | Apr 17 | — | Jul 10 – Oct 16 | 70–100 |
| Sweet Alyssum | Mar 6 | Mar 20 | Apr 17 | Sep 14 | May 29 – Aug 21 | 45–60 |
| Sweet Pea | — | Mar 13 | — | Aug 31 | May 22 – Aug 14 | 65–85 |
| Tulips | — | — | — | Sep 21 | Sep 7 – Sep 28 | 15–30 |
| Vinca (Annual) | Feb 6 | — | Apr 17 | — | Jun 26 – Oct 16 | 70–90 |
| Yarrow | Feb 13 | Apr 17 | Apr 24 | — | Jun 26 – Nov 6 | 60–90 |
| Zinnia | Mar 20 | Apr 17 | Apr 17 | — | Jun 26 – Oct 16 | 60–70 |
Monthly Planting Guide for Carroll County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Carroll County.
Frequently Asked Questions
What planting zone is Carroll County, MD?
Carroll County is in USDA Hardiness Zone 7a. This zone classification determines which perennial plants survive winter and sets the baseline for frost timing across the county.
When is the last frost in Carroll County, MD?
Based on 31 years of NOAA weather station data, the median last spring frost in Carroll County falls around April 17. In 8 out of 10 years, last frost lands between April 5 and May 9 — a 34-day window of variability. Use May 9 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Carroll County, MD?
The median first fall frost in Carroll County arrives around October 26. In cold years it can arrive as early as October 10; in mild years as late as November 6. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Carroll County?
Carroll County has a frost-free growing season of approximately 192 days. This is enough time for most warm-season crops including tomatoes, peppers, and squash with proper timing. Climate records show the growing season is trending longer by about 1.89 days per decade.
What is the soil like in Carroll County for gardening?
Carroll County has predominantly Silt Loam soil with a pH range of 5.6–6.5 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Carroll County?
Carroll County has commercial agriculture that includes Poultry, Soybeans, Corn, Hay, Wheat. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Carroll County a good location for home gardening?
Carroll County scores 63/100 (Good) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Conditions here are moderate — most common crops grow well with standard timing and care.
Your Carroll County Garden Planner — Free
A 22-page printable planner built for Carroll County (Zone 7a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log