McHenry County, IL — Planting Guide
Your June game plan for McHenry County, Illinois
We've pulled the most time-sensitive tasks for McHenry County, Illinois this June and put them front and centre. Tackle them in order.
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Begin indoor sowing: basil, peppers, and pole beans
Your window is short. These crops want several weeks of indoor growth before they go outside.
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It's harvest week for basil, carrots, and cucumber
Don't tug. Use scissors or pruners for clean cuts — torn stems invite disease.
July will be here before you know it — start on
- Starting indoors: vinca (annual)
- First harvests: basil, carrots, and cucumber
McHenry County is in USDA Zone 5b. The average last spring frost is April 18 and the first fall frost is October 20, giving you a growing season of approximately 185 days.
At an elevation of 640 ft, McHenry County receives approximately 39.4 in of rainfall annually. Summer highs average 84°F with winter lows around 13°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 27 days year to year — ranging from April 7 in warm years to May 4 in cold years. The growing season is trending shorter by about 2.29 days per decade. McHenry County scores 59/100 (Moderate) on the Microclimate Index.
🌡️ Zone
5b (-15°F to -10°F min)
❄️ Last Frost
April 18
🍂 First Frost
October 20
📅 Growing Season
185 days
⛰️ Elevation
640 ft
🌧️ Annual Rainfall
39.4 in
Monthly Watering Calendar for McHenry County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
Why this matters: A drip irrigation system pays for itself in 1-2 seasons in any climate. McHenry County's 39" annual rainfall determines whether you'll run it weekly (dry zones) or maybe just during summer dry spells (wet zones).
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.6 in | 7 days | — | None |
| Feb | 1.9 in | 6 days | — | None |
| Mar | 2.5 in | 7 days | — | None |
| Apr | 4.2 in | 10 days | 0.1 in | Low |
| May | 4.2 in | 9 days | 0.1 in | Low |
| Jun | 4.8 in | 10 days | — | Low |
| Jul | 4.1 in | 8 days | 0.2 in | Low |
| Aug | 4.5 in | 7 days | — | Low |
| Sep | 3.3 in | 8 days | 1 in | Moderate |
| Oct | 3.4 in | 7 days | 0.9 in | Moderate |
| Nov | 2.7 in | 9 days | — | None |
| Dec | 2.2 in | 8 days | — | None |
Annual total: 39.4 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.
McHenry County Soil Profile
Soil Type
Silt Loam
Soil pH
5.9-6.7
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 4 | Nov 4 | 184 days |
| Cautious | Apr 26 | Oct 27 | 184 days |
| Average year | Apr 18 | Oct 20 | 185 days |
| Optimistic | Apr 13 | Oct 11 | 181 days |
| Aggressive (risky) | Apr 7 | Oct 6 | 182 days |
Not very — frost dates can vary by ±27 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 shorter here (about 2.3 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
McHenry County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in McHenry 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 McHenry County's climate and soil.
County Extension Office
McHenry County University of Illinois Extension Extension Office
Phone: 217-333-7672
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 McHenry County
Finding local nurseries & garden centers in McHenry County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to McHenry 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 McHenry County IL" or "garden center McHenry 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 McHenry County IL" or check your extension office and local parks department. Facebook groups like "McHenry County Gardeners" or "Illinois 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 McHenry County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Why this matters: You can't change the sun. Picking the right day-length-matched varieties for McHenry County matters more than any other "fix" you make — and the seed packet tells you (look for "long-day," "short-day," "day-neutral").
Longest Day
15.1 hours
Summer solstice daylight
Shortest Day
8.9 hours
Winter solstice daylight
Peak Sun Hours
10 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 | 9.2 hr | 3.6 hr | Short day |
| February | 10.3 hr | 4.4 hr | Short day |
| March | 11.7 hr | 5.8 hr | Short day |
| April | 13.2 hr | 6.6 hr | Neutral |
| May | 14.4 hr | 8.1 hr | Long day |
| June | 15.1 hr | 8.9 hr | Long day |
| July | 14.8 hr | 10 hr | Long day |
| August | 13.7 hr | 8.7 hr | Neutral |
| September | 12.3 hr | 7 hr | Neutral |
| October | 10.8 hr | 5.4 hr | Short day |
| November | 9.5 hr | 3.8 hr | Short day |
| December | 8.9 hr | 3.5 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in McHenry County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Why it matters: Lettuce germinates at 35°F. Beans want 60°F. Tomatoes 65°F+. Soil temp, not air temp, is what plants feel. McHenry County's monthly curve tells you when each crop actually has the conditions to take off.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from Jun through Sep.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
6 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 | 22°F | 30°F | ❄️ Dormant | ~36 weeks |
| Feb | 25°F | 29°F | ❄️ Dormant | ~36 weeks |
| Mar | 31°F | 33°F | ❄️ Dormant | ~36 weeks |
| Apr | 47°F | 45°F | 🐢 Slow | ~24 weeks |
| May | 57°F | 53°F | ♻️ Active | ~14 weeks |
| Jun | 69°F | 65°F | 🔥 Peak | ~8 weeks |
| Jul | 76°F | 70°F | 🔥 Peak | ~8 weeks |
| Aug | 79°F | 72°F | 🔥 Peak | ~8 weeks |
| Sep | 70°F | 70°F | 🔥 Peak | ~8 weeks |
| Oct | 59°F | 59°F | ♻️ Active | ~14 weeks |
| Nov | 43°F | 50°F | 🐢 Slow | ~24 weeks |
| Dec | 30°F | 39°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 McHenry County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Quick context: Warm humid regions cycle through pest generations 3-5x faster than cold dry regions. McHenry County's pest score is your early-warning system: high score means commit to disease-resistant varieties and accept some crop loss to bugs.
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 | May, Jun, Jul, Aug |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Moderate | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
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 McHenry County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
For new gardeners: Cover crops protect microbial life through winter and summer. Bare soil bakes; covered soil stays cooler, moister, and biologically active. The difference shows up in next year's crops.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 26 | Aug 25 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 22 | Aug 25 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 20 | Aug 18 | ✓ 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 7 | Oct 6 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (6 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 24 | Mar 28 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 22 | Mar 28 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 9 | Apr 4 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 13 | Mar 28 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 28 | Mar 28 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 11 | Apr 4 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in McHenry County
For new gardeners: Pollinators avoid windy days. McHenry County's 8.3 mph average wind isn't enough to stop bees and butterflies — but plant fruiting crops (tomatoes, peppers, squash) in protected microclimates and you'll see noticeably better fruit set.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 12 mph Summer: 8 mph
Fall: 11 mph Winter: 11 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.7/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (79 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in McHenry County
How much water you can collect, when to collect it, and what size system you need for your garden.
Quick context: A gravity-fed rain barrel ($75) is the easy entry. A larger cistern ($500-1500) covers a whole growing season. McHenry County's 39" annual rainfall determines whether the larger system is overkill or essential.
Annual Collection
19,636 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 1,500 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Apr, May, Jun, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Feb, Dec
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 39.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 19,636 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Jan, Feb, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in McHenry County
Soil Type
Silt Loam
Soil pH 5.9–6.7 · Moderately Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 5.5/10
Moderate drought pressure. Drip irrigation and mulching are highly recommended to maintain soil moisture through summer.
Season Tips
185-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 McHenry County
105 vegetables that grow well in Zone 5b with planting dates for McHenry County.
Show all 105 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 14 | Apr 25 | May 2 | — | Jul 25 – Aug 29 | 80–100 |
| Amaranth | Feb 21 | Apr 25 | May 2 | — | Aug 1 – Sep 19 | 90–120 |
| Arugula | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 23 – Jul 25 | 30–50 |
| Asparagus | — | — | May 2 | — | — | 730–1095 |
| Beets | — | Apr 4 | — | Aug 11 | May 30 – Jun 27 | 50–70 |
| Belgian Endive | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Aug 8 – Oct 3 | 110–150 |
| Bitter Melon | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Aug 15 | 60–90 |
| Black Beans | — | Apr 25 | — | — | Jul 25 – Sep 12 | 90–120 |
| Bok Choy | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 30 – Jul 4 | 40–60 |
| Broccoli | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 20 – Aug 1 | 60–90 |
| Broccoli Rabe | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 30 – Jul 4 | 40–60 |
| Brussels Sprouts | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 18 – Sep 12 | 90–130 |
| Butternut Squash | Mar 14 | Apr 25 | May 2 | — | Aug 1 – Sep 5 | 85–110 |
| Cabbage | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 20 – Aug 15 | 60–100 |
| Calabash | Feb 21 | Apr 25 | May 2 | — | Jul 25 – Sep 19 | 80–120 |
| Carrots | — | Apr 4 | — | Aug 11 | Jun 6 – Jul 11 | 60–80 |
| Cauliflower | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Aug 15 | 55–100 |
| Celeriac | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Aug 1 – Sep 5 | 100–120 |
| Celery | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 11 – Sep 5 | 80–120 |
| Celtuce | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 20 – Aug 1 | 60–90 |
| Chard | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Aug 1 | 50–60 |
| Chickpeas | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 11 – Aug 22 | 80–110 |
| Chicory | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 20 – Aug 1 | 60–85 |
| Chinese Cabbage | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Jul 11 | 50–70 |
| Christmas Lima Beans | Feb 21 | Apr 25 | May 2 | — | Jul 25 – Aug 29 | 80–100 |
| Collard Greens | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Aug 15 | 55–75 |
| Corn | — | Apr 25 | — | — | Jun 27 – Aug 22 | 60–100 |
| Cowpeas | — | Apr 25 | — | — | Jun 27 – Aug 8 | 60–90 |
| Cress | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 2 – May 23 | 14–21 |
| Crookneck Squash | Mar 14 | Apr 25 | May 2 | — | Jun 20 – Jul 18 | 45–60 |
| Crosne | — | Apr 4 | — | Aug 11 | Sep 5 – Sep 19 | 150–200 |
| Cucumber | Mar 14 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 50–70 |
| Daikon | — | Apr 4 | — | Aug 11 | May 30 – Jun 27 | 50–70 |
| Delicata Squash | Mar 14 | Apr 25 | May 2 | — | Jul 25 – Aug 29 | 80–100 |
| Edamame | — | Apr 25 | — | — | Jul 11 – Aug 22 | 75–100 |
| Eggplant | Feb 7 | Apr 25 | May 2 | — | Jul 11 – Sep 12 | 65–85 |
| Endive | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 6 – Jul 11 | 45–65 |
| Escarole | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Jul 11 | 50–70 |
| Fava Beans | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 4 – Aug 15 | 75–100 |
| Fennel | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Aug 15 | 60–90 |
| Garlic | — | — | — | Sep 8 | Dec 8 – Feb 23 | 90–240 |
| Green Beans | — | Apr 25 | — | — | Jun 20 – Aug 15 | 50–65 |
| Horseradish | — | — | May 2 | — | Sep 5 – Oct 17 | 120–180 |
| Hot Peppers | Feb 7 | Apr 25 | May 2 | — | Jul 11 – Oct 17 | 70–120 |
| Hubbard Squash | Mar 14 | Apr 25 | May 2 | — | Aug 15 – Sep 19 | 100–120 |
| Kabocha | Mar 14 | Apr 25 | May 2 | — | Aug 1 – Aug 29 | 85–100 |
| Kai Lan | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 6 – Jul 4 | 45–60 |
| Kale | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Aug 8 | 50–70 |
| Kidney Beans | — | Apr 25 | — | — | Jul 25 – Aug 29 | 85–110 |
| Kohlrabi | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 6 – Jul 11 | 45–65 |
| Komatsuna | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 23 – Jun 27 | 35–50 |
| Leeks | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 18 – Oct 3 | 90–150 |
| Lentils | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 11 – Aug 22 | 80–110 |
| Lettuce | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 23 – Aug 1 | 30–60 |
| Lima Beans | — | Apr 25 | — | — | Jun 27 – Aug 8 | 60–90 |
| Mache | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 30 – Jul 4 | 40–60 |
| Melon | Mar 14 | Apr 25 | May 2 | — | Jul 11 – Aug 29 | 70–100 |
| Microgreens | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Apr 25 – May 23 | 7–21 |
| Mitsuba | Mar 14 | Apr 4 | Apr 11 | Aug 11 | Jun 6 – Aug 1 | 50–70 |
| Mizuna | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 23 – Jun 20 | 30–45 |
| Mustard Greens | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 23 – Jul 25 | 30–50 |
| Napa Cabbage | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Jul 18 | 55–75 |
| New Zealand Spinach | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Jul 25 | 55–70 |
| Okra | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 50–65 |
| Onion | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 18 – Sep 5 | 90–120 |
| Pac Choi | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 30 – Jun 27 | 40–55 |
| Parsnip | — | Apr 4 | — | Aug 11 | Jul 18 – Aug 29 | 100–130 |
| Patty Pan Squash | Mar 14 | Apr 25 | May 2 | — | Jun 20 – Jul 18 | 45–60 |
| Peas | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Aug 8 | 55–70 |
| Peppers | Feb 7 | Apr 25 | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Pole Beans | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 55–70 |
| Potatoes | Feb 21 | Apr 25 | May 2 | — | Jul 11 – Sep 19 | 70–120 |
| Pumpkin | Mar 14 | Apr 25 | May 2 | — | Aug 1 – Sep 19 | 85–120 |
| Purslane | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 30 – Jul 4 | 40–60 |
| Radicchio | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 20 – Jul 25 | 60–80 |
| Radish | — | Apr 4 | — | Aug 11 | May 2 – May 23 | 22–35 |
| Rhubarb | — | — | May 9 | — | — | 365–730 |
| Romanesco | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 4 – Aug 15 | 75–100 |
| Rutabaga | — | Apr 4 | — | Aug 11 | Jun 27 – Aug 1 | 80–100 |
| Salsify | — | Apr 4 | — | Aug 11 | Jul 18 – Aug 29 | 100–130 |
| Savoy Cabbage | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 27 – Aug 22 | 70–110 |
| Scallions | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Jul 11 | 50–70 |
| Scarlet Runner Beans | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Aug 8 | 60–80 |
| Shallot | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jul 18 – Sep 5 | 90–120 |
| Shiso | Feb 28 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 50–70 |
| Snap Peas | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 55–70 |
| Snow Peas | Mar 14 | Apr 4 | Apr 18 | Aug 11 | Jun 13 – Aug 8 | 50–65 |
| Soybeans | — | Apr 25 | — | — | Jul 18 – Sep 12 | 80–120 |
| Spaghetti Squash | Mar 14 | Apr 25 | May 2 | — | Aug 1 – Aug 29 | 85–100 |
| Spinach | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 23 – Jul 25 | 35–50 |
| Squash (Summer) | Mar 14 | Apr 25 | May 2 | — | Jun 20 – Aug 22 | 45–65 |
| Squash (Winter) | Mar 14 | Apr 25 | May 2 | — | Jul 25 – Sep 19 | 80–120 |
| Sunchoke | — | — | May 2 | — | Aug 22 – Oct 17 | 110–150 |
| Sweet Corn | — | Apr 25 | — | — | Jun 27 – Aug 8 | 60–90 |
| Sweet Potatoes | Feb 21 | Apr 25 | May 2 | — | Aug 1 – Sep 19 | 90–120 |
| Tatsoi | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 23 – Jun 27 | 35–50 |
| Tomatillo | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Sep 12 | 60–85 |
| Tomatoes | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Sep 12 | 60–85 |
| Turnip | — | Apr 4 | — | Aug 11 | May 16 – Jun 20 | 40–60 |
| Watercress | Mar 14 | Apr 4 | Apr 18 | Aug 11 | May 30 – Jul 4 | 40–60 |
| Watermelon | Mar 14 | Apr 25 | May 2 | — | Jul 11 – Aug 29 | 70–100 |
| Wax Beans | — | Apr 25 | — | — | Jun 20 – Aug 15 | 50–65 |
| Winter Melon | Feb 21 | Apr 25 | May 2 | — | Aug 1 – Sep 19 | 90–120 |
| Yard Long Beans | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Aug 8 | 55–80 |
| Zucchini | Mar 14 | Apr 25 | May 2 | — | Jun 20 – Aug 15 | 45–60 |
🍓 Fruits to Grow in McHenry County
27 fruits that grow well in Zone 5b with planting dates for McHenry County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 9 | — | Aug 8 – Oct 24 | 90–180 |
| Aronia | — | — | May 9 | — | — | 730–1095 |
| Blackberries | — | — | May 9 | — | — | 365–730 |
| Blueberries | — | — | May 9 | — | — | 730–1095 |
| Boysenberries | — | — | May 9 | — | — | 365–730 |
| Cantaloupe | — | — | May 9 | — | Jul 18 – Aug 22 | 70–90 |
| Che Fruit | — | — | May 9 | — | — | 1095–1825 |
| Cranberries | — | — | May 9 | — | — | 730–1095 |
| Currants | — | — | May 9 | — | — | 730–1095 |
| Elderberries | — | — | May 9 | — | — | 730–1095 |
| Goji Berries | — | — | May 9 | — | — | 730–1095 |
| Gooseberries | — | — | May 9 | — | — | 730–1095 |
| Grapes | — | — | May 9 | — | — | 730–1095 |
| Ground Cherry | — | — | May 9 | — | Jul 18 – Sep 12 | 65–80 |
| Hardy Kiwi | — | — | May 9 | — | — | 1095–1825 |
| Haskaps | — | — | May 9 | — | — | 730–1095 |
| Honeydew | — | — | May 9 | — | Aug 1 – Sep 12 | 80–110 |
| Jostaberry | — | — | May 9 | — | — | 730–1095 |
| Lingonberries | — | — | May 9 | — | — | 730–1095 |
| Medlar | — | — | May 9 | — | — | 1095–1825 |
| Mulberries | — | — | May 9 | — | — | 730–1825 |
| Pawpaw | — | — | May 9 | — | — | 1095–2555 |
| Persimmon | — | — | May 9 | — | — | 1095–2555 |
| Quince | — | — | May 9 | — | — | 1095–1825 |
| Raspberries | — | — | May 9 | — | — | 365–730 |
| Serviceberries | — | — | May 9 | — | — | 730–1095 |
| Strawberries | — | — | May 9 | — | Aug 8 – Oct 24 | 90–365 |
🌿 Herbs to Grow in McHenry County
34 herbs that grow well in Zone 5b with planting dates for McHenry County.
Show all 34 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 14 | Apr 4 | Apr 11 | Aug 11 | — | 365–730 |
| Anise | Mar 14 | Apr 4 | Apr 11 | Aug 11 | Jul 11 – Sep 26 | 90–120 |
| Basil | Feb 28 | Apr 25 | May 2 | — | Jun 27 – Aug 29 | 50–75 |
| Bee Balm | — | — | Apr 25 | — | Jul 25 – Oct 10 | 90–120 |
| Borage | Mar 14 | Apr 4 | Apr 11 | Aug 11 | Jun 6 – Jul 25 | 50–60 |
| Caraway | Mar 14 | Apr 4 | Apr 11 | Aug 11 | — | 365–450 |
| Catnip | — | — | Apr 25 | — | Jun 27 – Aug 29 | 60–80 |
| Chamomile | Mar 14 | Apr 4 | Apr 11 | Aug 11 | Jun 13 – Aug 22 | 60–90 |
| Chervil | Mar 14 | Apr 4 | Apr 11 | Aug 11 | May 23 – Jul 25 | 40–60 |
| Chives | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Cilantro | Mar 14 | Apr 4 | Apr 11 | Aug 11 | May 23 – Jul 25 | 40–60 |
| Comfrey | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Cumin | Mar 14 | Apr 4 | Apr 11 | Aug 11 | Jul 25 – Sep 26 | 100–120 |
| Dill | Mar 14 | Apr 4 | Apr 11 | Aug 11 | May 23 – Jul 25 | 40–60 |
| Epazote | Feb 28 | Apr 25 | May 2 | — | Jun 20 – Aug 15 | 45–60 |
| Fennel (herb) | Mar 14 | Apr 4 | Apr 11 | Aug 11 | Jun 13 – Aug 22 | 60–90 |
| Feverfew | — | — | Apr 25 | — | Jul 25 – Oct 10 | 90–120 |
| Garlic Chives | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Horehound | — | — | Apr 25 | — | Jul 11 – Sep 5 | 75–90 |
| Hyssop | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Lemon Balm | — | — | Apr 25 | — | Jun 27 – Aug 15 | 60–70 |
| Lemon Thyme | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Lovage | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Mint | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Oregano | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Parsley | Mar 14 | Apr 4 | Apr 11 | Aug 11 | Jun 13 – Aug 15 | 60–80 |
| Rue | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Sage | — | — | Apr 25 | — | Jul 11 – Sep 5 | 75–90 |
| Savory | — | — | Apr 25 | — | Jun 20 – Aug 15 | 50–70 |
| Sorrel | Mar 14 | Apr 4 | Apr 11 | Aug 11 | May 23 – Jul 25 | 40–60 |
| Tarragon | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Thai Basil | Feb 28 | Apr 25 | May 2 | — | Jun 27 – Aug 29 | 50–75 |
| Thyme | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Valerian | — | — | Apr 25 | — | Aug 29 – Oct 10 | 120–180 |
🌸 Flowers to Grow in McHenry County
51 flowers that grow well in Zone 5b with planting dates for McHenry County.
Show all 51 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Feb 28 | Apr 25 | Apr 25 | — | Jun 20 – Sep 19 | 60–75 |
| Alliums | — | — | — | Sep 8 | Oct 13 – Nov 3 | 28–42 |
| Anemones | Mar 21 | — | Apr 18 | — | May 23 – Jun 20 | 90–120 |
| Astilbe | Feb 14 | — | May 2 | — | Jul 18 – Sep 26 | 70–100 |
| Bachelor's Button | Mar 7 | Mar 28 | Apr 18 | — | Jun 20 – Sep 5 | 60–90 |
| Begonias | Feb 7 | — | Apr 25 | — | Jul 4 – Sep 26 | 70–90 |
| Black-eyed Susan | Feb 14 | Apr 18 | May 2 | — | Jul 18 – Oct 24 | 60–80 |
| Bleeding Hearts | Feb 14 | — | May 2 | — | Jun 27 – Aug 8 | 60–90 |
| Calendula | Mar 7 | Mar 28 | Apr 18 | — | Jun 6 – Sep 5 | 50–70 |
| Celosia | Mar 14 | Apr 25 | Apr 25 | — | Jun 27 – Oct 3 | 60–90 |
| Columbine | Feb 14 | May 2 | May 2 | — | Jun 27 – Aug 8 | 70–100 |
| Coreopsis | Feb 14 | Apr 25 | May 2 | — | Jul 11 – Oct 24 | 60–80 |
| Cosmos | Mar 21 | Apr 18 | Apr 18 | — | Jun 27 – Sep 26 | 60–90 |
| Crocus | — | — | — | Sep 8 | Jul 21 – Aug 11 | 10–20 |
| Daffodils | — | — | — | Sep 8 | Jul 28 – Aug 18 | 20–40 |
| Dahlias | Mar 21 | Apr 25 | Apr 25 | — | Jul 18 – Oct 17 | 70–120 |
| Daylily | Feb 14 | — | May 2 | — | Jul 25 – Oct 24 | 60–90 |
| Dianthus | Feb 14 | Mar 21 | Apr 4 | — | May 23 – Aug 15 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 14 | May 2 | May 2 | — | Jul 25 – Oct 24 | 70–90 |
| Foxglove | Feb 14 | May 2 | May 2 | — | Jun 27 – Aug 8 | 80–120 |
| Gaillardia (Blanket Flower) | Feb 21 | Apr 25 | Apr 25 | — | Jul 4 – Oct 24 | 70–100 |
| Geraniums | Feb 7 | — | Apr 25 | — | Jul 4 – Sep 26 | 70–100 |
| Gladiolus | — | Apr 25 | Apr 25 | — | Jul 18 – Oct 17 | 70–100 |
| Hostas | Feb 7 | — | May 2 | — | Jul 25 – Oct 24 | 60–90 |
| Hyacinths | — | — | — | Sep 8 | Aug 18 – Sep 15 | 14–28 |
| Hydrangeas | Feb 7 | — | May 2 | — | Jul 18 – Oct 10 | 90–150 |
| Impatiens | Feb 21 | — | Apr 25 | — | Jul 4 – Oct 3 | 60–75 |
| Irises | — | Division | May 2 | — | Jun 27 – Aug 1 | 60–100 |
| Larkspur | — | Mar 21 | — | — | May 30 – Jul 25 | 60–90 |
| Lavender | Feb 7 | — | May 9 | — | Jul 18 – Sep 5 | 90–120 |
| Lilies | — | Division | May 2 | — | Jul 11 – Oct 10 | 70–120 |
| Lobelia | Feb 7 | — | Apr 11 | — | Jun 6 – Aug 22 | 70–80 |
| Lupine | Feb 14 | May 2 | May 2 | — | Jun 27 – Aug 8 | 75–100 |
| Marigolds | Mar 7 | Apr 25 | Apr 25 | — | Jun 20 – Sep 19 | 50–70 |
| Nasturtium | Mar 21 | Apr 25 | Apr 25 | — | Jun 20 – Oct 3 | 55–65 |
| Pansy | Feb 7 | — | Apr 18 | — | Jun 13 – Aug 15 | 70–90 |
| Peonies | — | Division | May 2 | — | Jul 11 – Aug 22 | 90–120 |
| Petunia | Feb 21 | — | Apr 25 | — | Jul 4 – Oct 3 | 70–90 |
| Phlox | Feb 14 | May 2 | May 2 | — | Jul 18 – Oct 10 | 80–110 |
| Portulaca | Mar 14 | Apr 25 | Apr 25 | — | Jun 13 – Sep 19 | 50–70 |
| Roses | Feb 7 | — | May 2 | — | Jul 18 – Oct 24 | 90–180 |
| Salvia | Feb 14 | — | Apr 25 | — | Jul 4 – Oct 3 | 70–90 |
| Sedum (Stonecrop) | Feb 14 | — | May 2 | — | Aug 29 – Nov 7 | 60–90 |
| Snapdragon | Feb 7 | Apr 4 | Apr 18 | — | Jun 27 – Sep 5 | 70–100 |
| Sunflower | Mar 28 | Apr 25 | Apr 25 | — | Jul 18 – Oct 3 | 70–100 |
| Sweet Alyssum | Feb 28 | Apr 4 | Apr 18 | — | May 30 – Aug 8 | 45–60 |
| Sweet Pea | Mar 7 | Mar 14 | Apr 18 | — | Jul 4 – Sep 5 | 65–85 |
| Tulips | — | — | — | Sep 8 | Aug 11 – Sep 1 | 15–30 |
| Vinca (Annual) | Jan 31 | — | Apr 25 | — | Jul 4 – Sep 26 | 70–90 |
| Yarrow | Feb 14 | Apr 18 | May 2 | — | Jul 11 – Oct 24 | 60–90 |
| Zinnia | Mar 21 | Apr 25 | Apr 25 | — | Jul 4 – Oct 3 | 60–70 |
Monthly Planting Guide for McHenry County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in McHenry County.
Frequently Asked Questions
What planting zone is McHenry County, IL?
McHenry County is in USDA Hardiness Zone 5b. 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 McHenry County, IL?
Based on 31 years of NOAA weather station data, the median last spring frost in McHenry County falls around April 18. In 8 out of 10 years, last frost lands between April 7 and May 4 — a 27-day window of variability. Use May 4 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in McHenry County, IL?
The median first fall frost in McHenry County arrives around October 20. In cold years it can arrive as early as October 6; in mild years as late as November 4. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in McHenry County?
McHenry County has a frost-free growing season of approximately 185 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 shorter by about 2.29 days per decade.
What is the soil like in McHenry County for gardening?
McHenry County has predominantly Silt Loam soil with a pH range of 5.9–6.7 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in McHenry County?
McHenry County has commercial agriculture that includes Corn, Soybeans, Hay, Wheat, Oats. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is McHenry County a good location for home gardening?
McHenry County scores 59/100 (Moderate) 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 McHenry County Garden Planner — Free
A 22-page printable planner built for McHenry County (Zone 5b). 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