Boone County, IL — Planting Guide
Your June gardening checklist
Your garden in Boone County, Illinois is working on a schedule, even when you're not. Here's where you should be this June.
-
Fire up the seed-starting tray: basil, pole beans, and thai basil
These need a head start before your last frost (April 23). Sow into cells now so you're ready to transplant in a few weeks.
-
Bring in the carrots, green beans, and kale
If you can't use it all right away, check the food-preservation section of your planner.
To set up a strong July, finish these tasks
- Starting indoors: peppers, begonias, and eggplant
- First harvests: basil, carrots, and cucumber
Boone County is in USDA Zone 5b. The average last spring frost is April 23 and the first fall frost is October 16, giving you a growing season of approximately 176 days.
At an elevation of 512 ft, Boone County receives approximately 39.9 in of rainfall annually. Summer highs average 83°F with winter lows around 14°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 12 in warm years to May 10 in cold years. The growing season is trending shorter by about 0.82 days per decade. Boone County scores 69/100 (Good) on the Microclimate Index.
🌡️ Zone
5b (-15°F to -10°F min)
❄️ Last Frost
April 23
🍂 First Frost
October 16
📅 Growing Season
176 days
⛰️ Elevation
512 ft
🌧️ Annual Rainfall
39.9 in
Monthly Watering Calendar for Boone 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: Over-watering kills more plants than under-watering. Boone County's 40" annual rainfall changes the gardening playbook — humid-region gardeners often water by the calendar when they should water by the soil moisture.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.6 in | 7 days | — | None |
| Feb | 1.5 in | 5 days | — | None |
| Mar | 2.7 in | 9 days | — | None |
| Apr | 3.4 in | 9 days | 0.9 in | Moderate |
| May | 4.1 in | 10 days | 0.2 in | Low |
| Jun | 5.7 in | 9 days | — | Low |
| Jul | 4.9 in | 9 days | — | Low |
| Aug | 3.8 in | 8 days | 0.5 in | Low |
| Sep | 3.5 in | 6 days | 0.8 in | Moderate |
| Oct | 3.5 in | 8 days | 0.8 in | Moderate |
| Nov | 2.9 in | 8 days | — | None |
| Dec | 2.3 in | 9 days | — | None |
Annual total: 39.9 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.
Boone County Soil Profile
Soil Type
Silt Loam
Soil pH
6-6.8
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 10 | Oct 30 | 173 days |
| Cautious | Apr 28 | Oct 22 | 177 days |
| Average year | Apr 23 | Oct 16 | 176 days |
| Optimistic | Apr 17 | Oct 11 | 177 days |
| Aggressive (risky) | Apr 12 | Oct 5 | 176 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.
Slightly — seasons are trending a bit shorter (0.8 days/decade). Stay conservative with planting dates.
Gardening Difficulty Score
Boone County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Boone 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 Boone County's climate and soil.
County Extension Office
Boone 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 Boone County
Finding local nurseries & garden centers in Boone County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Boone 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 Boone County IL" or "garden center Boone 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 Boone County IL" or check your extension office and local parks department. Facebook groups like "Boone 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 Boone 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). Boone County's curve is the timing layer beneath everything you grow.
Longest Day
15.1 hours
Summer solstice daylight
Shortest Day
8.9 hours
Winter solstice daylight
Peak Sun Hours
9.5 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 | 3.7 hr | Short day |
| February | 10.3 hr | 4.4 hr | Short day |
| March | 11.7 hr | 5.4 hr | Short day |
| April | 13.2 hr | 6.5 hr | Neutral |
| May | 14.4 hr | 8.3 hr | Long day |
| June | 15.1 hr | 9.5 hr | Long day |
| July | 14.8 hr | 9.3 hr | Long day |
| August | 13.7 hr | 8.3 hr | Neutral |
| September | 12.3 hr | 6.9 hr | Neutral |
| October | 10.8 hr | 5.5 hr | Short day |
| November | 9.5 hr | 4 hr | Short day |
| December | 8.9 hr | 3.3 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Boone County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
For new gardeners: Air temperature lies. Your air can be 70°F in April but the soil 4 inches down is still 50°F — too cold for tomatoes or peppers to root properly. Boone County's soil temperature curve tells you the real planting window. A $5 soil thermometer pays for itself in one season.
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 | 23°F | 30°F | ❄️ Dormant | ~36 weeks |
| Feb | 22°F | 28°F | ❄️ Dormant | ~36 weeks |
| Mar | 32°F | 35°F | ❄️ Dormant | ~36 weeks |
| Apr | 44°F | 43°F | 🐢 Slow | ~24 weeks |
| May | 57°F | 54°F | ♻️ Active | ~14 weeks |
| Jun | 71°F | 64°F | 🔥 Peak | ~8 weeks |
| Jul | 78°F | 72°F | 🔥 Peak | ~8 weeks |
| Aug | 77°F | 73°F | 🔥 Peak | ~8 weeks |
| Sep | 70°F | 68°F | 🔥 Peak | ~8 weeks |
| Oct | 59°F | 61°F | ♻️ Active | ~14 weeks |
| Nov | 43°F | 49°F | 🐢 Slow | ~24 weeks |
| Dec | 31°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 Boone County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Quick context: In Boone County's climate, pest pressure shapes which crops are easy and which are heartbreak. Tomatoes are easy in dry mountain air, hard in humid coast — same plant, completely different gardening experience.
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 5 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 | Moderate | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
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 Boone County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
The practical takeaway: Why not just leave bare soil? Weed seeds, erosion, nutrient leaching, and crust formation. A cover crop solves all of these for the cost of seeds and one mowing.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 28 | Aug 14 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 25 | Aug 21 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 26 | Aug 14 | ✓ 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 14 | Sep 18 | — | 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 4 | Apr 9 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Sep 6 | Apr 2 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 5 | Apr 9 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 7 | Apr 2 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 17 | Apr 9 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 20 | Apr 9 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Boone County
Why it 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. Boone County's 8.4 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: 12 mph Summer: 8 mph
Fall: 9 mph Winter: 11 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.9/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (220 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Boone County
How much water you can collect, when to collect it, and what size system you need for your garden.
The practical takeaway: Rainwater is unchlorinated, unfluoridated, and at ambient temperature — plants actually prefer it. Boone County's 40" annual rainfall means even a small 50-gallon barrel catches enough for a few weeks of garden watering between storms.
Annual Collection
19,886 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
May, Jun, Jul, 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 39.9 inches of rain per year
- A 1,000 sq ft roof can collect roughly 19,886 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 Boone County
Soil Type
Silt Loam
Soil pH 6–6.8 · Excessively 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
176-day frost-free season
Start warm-season crops indoors and focus on short-season varieties. Cold frames extend your season by 3–4 weeks in fall.
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 Boone County
105 vegetables that grow well in Zone 5b with planting dates for Boone County.
Show all 105 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 19 | Apr 30 | May 7 | — | Jul 30 – Sep 3 | 80–100 |
| Amaranth | Feb 26 | Apr 30 | May 7 | — | Aug 6 – Sep 24 | 90–120 |
| Arugula | Mar 19 | Apr 9 | Apr 23 | Aug 7 | May 28 – Jul 30 | 30–50 |
| Asparagus | — | — | May 7 | — | — | 730–1095 |
| Beets | — | Apr 9 | — | Aug 7 | Jun 4 – Jul 2 | 50–70 |
| Belgian Endive | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Aug 13 – Oct 8 | 110–150 |
| Bitter Melon | Feb 26 | Apr 30 | May 7 | — | Jul 9 – Aug 20 | 60–90 |
| Black Beans | — | Apr 30 | — | — | Jul 30 – Sep 17 | 90–120 |
| Bok Choy | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 4 – Jul 9 | 40–60 |
| Broccoli | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 25 – Aug 6 | 60–90 |
| Broccoli Rabe | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 4 – Jul 9 | 40–60 |
| Brussels Sprouts | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 23 – Sep 17 | 90–130 |
| Butternut Squash | Mar 19 | Apr 30 | May 7 | — | Aug 6 – Sep 10 | 85–110 |
| Cabbage | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 25 – Aug 20 | 60–100 |
| Calabash | Feb 26 | Apr 30 | May 7 | — | Jul 30 – Sep 24 | 80–120 |
| Carrots | — | Apr 9 | — | Aug 7 | Jun 11 – Jul 16 | 60–80 |
| Cauliflower | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Aug 20 | 55–100 |
| Celeriac | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Aug 6 – Sep 10 | 100–120 |
| Celery | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 16 – Sep 10 | 80–120 |
| Celtuce | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 25 – Aug 6 | 60–90 |
| Chard | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Aug 6 | 50–60 |
| Chickpeas | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 16 – Aug 27 | 80–110 |
| Chicory | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 25 – Aug 6 | 60–85 |
| Chinese Cabbage | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Jul 16 | 50–70 |
| Christmas Lima Beans | Feb 26 | Apr 30 | May 7 | — | Jul 30 – Sep 3 | 80–100 |
| Collard Greens | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Aug 20 | 55–75 |
| Corn | — | Apr 30 | — | — | Jul 2 – Aug 27 | 60–100 |
| Cowpeas | — | Apr 30 | — | — | Jul 2 – Aug 13 | 60–90 |
| Cress | Mar 19 | Apr 9 | Apr 23 | Aug 7 | May 7 – May 28 | 14–21 |
| Crookneck Squash | Mar 19 | Apr 30 | May 7 | — | Jun 25 – Jul 23 | 45–60 |
| Crosne | — | Apr 9 | — | Aug 7 | Sep 10 – Sep 24 | 150–200 |
| Cucumber | Mar 19 | Apr 30 | May 7 | — | Jul 2 – Aug 27 | 50–70 |
| Daikon | — | Apr 9 | — | Aug 7 | Jun 4 – Jul 2 | 50–70 |
| Delicata Squash | Mar 19 | Apr 30 | May 7 | — | Jul 30 – Sep 3 | 80–100 |
| Edamame | — | Apr 30 | — | — | Jul 16 – Aug 27 | 75–100 |
| Eggplant | Feb 12 | Apr 30 | May 7 | — | Jul 16 – Sep 17 | 65–85 |
| Endive | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 11 – Jul 16 | 45–65 |
| Escarole | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Jul 16 | 50–70 |
| Fava Beans | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 9 – Aug 20 | 75–100 |
| Fennel | Feb 26 | Apr 30 | May 7 | — | Jul 9 – Aug 20 | 60–90 |
| Garlic | — | — | — | Sep 4 | Dec 4 – Feb 19 | 90–240 |
| Green Beans | — | Apr 30 | — | — | Jun 25 – Aug 20 | 50–65 |
| Horseradish | — | — | May 7 | — | Sep 10 – Oct 22 | 120–180 |
| Hot Peppers | Feb 12 | Apr 30 | May 7 | — | Jul 16 – Oct 22 | 70–120 |
| Hubbard Squash | Mar 19 | Apr 30 | May 7 | — | Aug 20 – Sep 24 | 100–120 |
| Kabocha | Mar 19 | Apr 30 | May 7 | — | Aug 6 – Sep 3 | 85–100 |
| Kai Lan | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 11 – Jul 9 | 45–60 |
| Kale | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Aug 13 | 50–70 |
| Kidney Beans | — | Apr 30 | — | — | Jul 30 – Sep 3 | 85–110 |
| Kohlrabi | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 11 – Jul 16 | 45–65 |
| Komatsuna | Mar 19 | Apr 9 | Apr 23 | Aug 7 | May 28 – Jul 2 | 35–50 |
| Leeks | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 23 – Oct 8 | 90–150 |
| Lentils | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 16 – Aug 27 | 80–110 |
| Lettuce | Mar 19 | Apr 9 | Apr 23 | Aug 7 | May 28 – Aug 6 | 30–60 |
| Lima Beans | — | Apr 30 | — | — | Jul 2 – Aug 13 | 60–90 |
| Mache | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 4 – Jul 9 | 40–60 |
| Melon | Mar 19 | Apr 30 | May 7 | — | Jul 16 – Sep 3 | 70–100 |
| Microgreens | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Apr 30 – May 28 | 7–21 |
| Mitsuba | Mar 19 | Apr 9 | Apr 16 | Aug 7 | Jun 11 – Aug 6 | 50–70 |
| Mizuna | Mar 19 | Apr 9 | Apr 23 | Aug 7 | May 28 – Jun 25 | 30–45 |
| Mustard Greens | Mar 19 | Apr 9 | Apr 23 | Aug 7 | May 28 – Jul 30 | 30–50 |
| Napa Cabbage | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Jul 23 | 55–75 |
| New Zealand Spinach | Feb 26 | Apr 30 | May 7 | — | Jul 2 – Jul 30 | 55–70 |
| Okra | Feb 26 | Apr 30 | May 7 | — | Jul 2 – Aug 27 | 50–65 |
| Onion | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 23 – Sep 10 | 90–120 |
| Pac Choi | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 4 – Jul 2 | 40–55 |
| Parsnip | — | Apr 9 | — | Aug 7 | Jul 23 – Sep 3 | 100–130 |
| Patty Pan Squash | Mar 19 | Apr 30 | May 7 | — | Jun 25 – Jul 23 | 45–60 |
| Peas | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Aug 13 | 55–70 |
| Peppers | Feb 12 | Apr 30 | May 7 | — | Jul 9 – Sep 17 | 60–90 |
| Pole Beans | Feb 26 | Apr 30 | May 7 | — | Jul 2 – Aug 27 | 55–70 |
| Potatoes | Feb 26 | Apr 30 | May 7 | — | Jul 16 – Sep 24 | 70–120 |
| Pumpkin | Mar 19 | Apr 30 | May 7 | — | Aug 6 – Sep 24 | 85–120 |
| Purslane | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 4 – Jul 9 | 40–60 |
| Radicchio | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 25 – Jul 30 | 60–80 |
| Radish | — | Apr 9 | — | Aug 7 | May 7 – May 28 | 22–35 |
| Rhubarb | — | — | May 14 | — | — | 365–730 |
| Romanesco | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 9 – Aug 20 | 75–100 |
| Rutabaga | — | Apr 9 | — | Aug 7 | Jul 2 – Aug 6 | 80–100 |
| Salsify | — | Apr 9 | — | Aug 7 | Jul 23 – Sep 3 | 100–130 |
| Savoy Cabbage | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 2 – Aug 27 | 70–110 |
| Scallions | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Jul 16 | 50–70 |
| Scarlet Runner Beans | Feb 26 | Apr 30 | May 7 | — | Jul 9 – Aug 13 | 60–80 |
| Shallot | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jul 23 – Sep 10 | 90–120 |
| Shiso | Mar 5 | Apr 30 | May 7 | — | Jul 2 – Aug 27 | 50–70 |
| Snap Peas | Feb 26 | Apr 30 | May 7 | — | Jul 2 – Aug 27 | 55–70 |
| Snow Peas | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 18 – Aug 13 | 50–65 |
| Soybeans | — | Apr 30 | — | — | Jul 23 – Sep 17 | 80–120 |
| Spaghetti Squash | Mar 19 | Apr 30 | May 7 | — | Aug 6 – Sep 3 | 85–100 |
| Spinach | Mar 19 | Apr 9 | Apr 23 | Aug 7 | May 28 – Jul 30 | 35–50 |
| Squash (Summer) | Mar 19 | Apr 30 | May 7 | — | Jun 25 – Aug 27 | 45–65 |
| Squash (Winter) | Mar 19 | Apr 30 | May 7 | — | Jul 30 – Sep 24 | 80–120 |
| Sunchoke | — | — | May 7 | — | Aug 27 – Oct 22 | 110–150 |
| Sweet Corn | — | Apr 30 | — | — | Jul 2 – Aug 13 | 60–90 |
| Sweet Potatoes | Feb 26 | Apr 30 | May 7 | — | Aug 6 – Sep 24 | 90–120 |
| Tatsoi | Mar 19 | Apr 9 | Apr 23 | Aug 7 | May 28 – Jul 2 | 35–50 |
| Tomatillo | Feb 26 | Apr 30 | May 7 | — | Jul 9 – Sep 17 | 60–85 |
| Tomatoes | Feb 26 | Apr 30 | May 7 | — | Jul 9 – Sep 17 | 60–85 |
| Turnip | — | Apr 9 | — | Aug 7 | May 21 – Jun 25 | 40–60 |
| Watercress | Mar 19 | Apr 9 | Apr 23 | Aug 7 | Jun 4 – Jul 9 | 40–60 |
| Watermelon | Mar 19 | Apr 30 | May 7 | — | Jul 16 – Sep 3 | 70–100 |
| Wax Beans | — | Apr 30 | — | — | Jun 25 – Aug 20 | 50–65 |
| Winter Melon | Feb 26 | Apr 30 | May 7 | — | Aug 6 – Sep 24 | 90–120 |
| Yard Long Beans | Feb 26 | Apr 30 | May 7 | — | Jul 2 – Aug 13 | 55–80 |
| Zucchini | Mar 19 | Apr 30 | May 7 | — | Jun 25 – Aug 20 | 45–60 |
🍓 Fruits to Grow in Boone County
27 fruits that grow well in Zone 5b with planting dates for Boone County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 14 | — | Aug 13 – Oct 29 | 90–180 |
| Aronia | — | — | May 14 | — | — | 730–1095 |
| Blackberries | — | — | May 14 | — | — | 365–730 |
| Blueberries | — | — | May 14 | — | — | 730–1095 |
| Boysenberries | — | — | May 14 | — | — | 365–730 |
| Cantaloupe | — | — | May 14 | — | Jul 23 – Aug 27 | 70–90 |
| Che Fruit | — | — | May 14 | — | — | 1095–1825 |
| Cranberries | — | — | May 14 | — | — | 730–1095 |
| Currants | — | — | May 14 | — | — | 730–1095 |
| Elderberries | — | — | May 14 | — | — | 730–1095 |
| Goji Berries | — | — | May 14 | — | — | 730–1095 |
| Gooseberries | — | — | May 14 | — | — | 730–1095 |
| Grapes | — | — | May 14 | — | — | 730–1095 |
| Ground Cherry | — | — | May 14 | — | Jul 23 – Sep 17 | 65–80 |
| Hardy Kiwi | — | — | May 14 | — | — | 1095–1825 |
| Haskaps | — | — | May 14 | — | — | 730–1095 |
| Honeydew | — | — | May 14 | — | Aug 6 – Sep 17 | 80–110 |
| Jostaberry | — | — | May 14 | — | — | 730–1095 |
| Lingonberries | — | — | May 14 | — | — | 730–1095 |
| Medlar | — | — | May 14 | — | — | 1095–1825 |
| Mulberries | — | — | May 14 | — | — | 730–1825 |
| Pawpaw | — | — | May 14 | — | — | 1095–2555 |
| Persimmon | — | — | May 14 | — | — | 1095–2555 |
| Quince | — | — | May 14 | — | — | 1095–1825 |
| Raspberries | — | — | May 14 | — | — | 365–730 |
| Serviceberries | — | — | May 14 | — | — | 730–1095 |
| Strawberries | — | — | May 14 | — | Aug 13 – Oct 29 | 90–365 |
🌿 Herbs to Grow in Boone County
34 herbs that grow well in Zone 5b with planting dates for Boone County.
Show all 34 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 19 | Apr 9 | Apr 16 | Aug 7 | — | 365–730 |
| Anise | Mar 19 | Apr 9 | Apr 16 | Aug 7 | Jul 16 – Oct 1 | 90–120 |
| Basil | Mar 5 | Apr 30 | May 7 | — | Jul 2 – Sep 3 | 50–75 |
| Bee Balm | — | — | Apr 30 | — | Jul 30 – Oct 15 | 90–120 |
| Borage | Mar 19 | Apr 9 | Apr 16 | Aug 7 | Jun 11 – Jul 30 | 50–60 |
| Caraway | Mar 19 | Apr 9 | Apr 16 | Aug 7 | — | 365–450 |
| Catnip | — | — | Apr 30 | — | Jul 2 – Sep 3 | 60–80 |
| Chamomile | Mar 19 | Apr 9 | Apr 16 | Aug 7 | Jun 18 – Aug 27 | 60–90 |
| Chervil | Mar 19 | Apr 9 | Apr 16 | Aug 7 | May 28 – Jul 30 | 40–60 |
| Chives | — | — | Apr 30 | — | Jul 2 – Sep 10 | 60–90 |
| Cilantro | Mar 19 | Apr 9 | Apr 16 | Aug 7 | May 28 – Jul 30 | 40–60 |
| Comfrey | — | — | Apr 30 | — | Jul 2 – Sep 10 | 60–90 |
| Cumin | Mar 19 | Apr 9 | Apr 16 | Aug 7 | Jul 30 – Oct 1 | 100–120 |
| Dill | Mar 19 | Apr 9 | Apr 16 | Aug 7 | May 28 – Jul 30 | 40–60 |
| Epazote | Mar 5 | Apr 30 | May 7 | — | Jun 25 – Aug 20 | 45–60 |
| Fennel (herb) | Mar 19 | Apr 9 | Apr 16 | Aug 7 | Jun 18 – Aug 27 | 60–90 |
| Feverfew | — | — | Apr 30 | — | Jul 30 – Oct 15 | 90–120 |
| Garlic Chives | — | — | Apr 30 | — | Jul 2 – Sep 10 | 60–90 |
| Horehound | — | — | Apr 30 | — | Jul 16 – Sep 10 | 75–90 |
| Hyssop | — | — | Apr 30 | — | Jul 9 – Sep 10 | 70–90 |
| Lemon Balm | — | — | Apr 30 | — | Jul 2 – Aug 20 | 60–70 |
| Lemon Thyme | — | — | Apr 30 | — | Jul 9 – Sep 10 | 70–90 |
| Lovage | — | — | Apr 30 | — | Jul 9 – Sep 10 | 70–90 |
| Mint | — | — | Apr 30 | — | Jul 2 – Sep 10 | 60–90 |
| Oregano | — | — | Apr 30 | — | Jul 2 – Sep 10 | 60–90 |
| Parsley | Mar 19 | Apr 9 | Apr 16 | Aug 7 | Jun 18 – Aug 20 | 60–80 |
| Rue | — | — | Apr 30 | — | Jul 9 – Sep 10 | 70–90 |
| Sage | — | — | Apr 30 | — | Jul 16 – Sep 10 | 75–90 |
| Savory | — | — | Apr 30 | — | Jun 25 – Aug 20 | 50–70 |
| Sorrel | Mar 19 | Apr 9 | Apr 16 | Aug 7 | May 28 – Jul 30 | 40–60 |
| Tarragon | — | — | Apr 30 | — | Jul 2 – Sep 10 | 60–90 |
| Thai Basil | Mar 5 | Apr 30 | May 7 | — | Jul 2 – Sep 3 | 50–75 |
| Thyme | — | — | Apr 30 | — | Jul 9 – Sep 10 | 70–90 |
| Valerian | — | — | Apr 30 | — | Sep 3 – Oct 15 | 120–180 |
🌸 Flowers to Grow in Boone County
51 flowers that grow well in Zone 5b with planting dates for Boone County.
Show all 51 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 5 | Apr 30 | Apr 30 | — | Jun 25 – Sep 24 | 60–75 |
| Alliums | — | — | — | Sep 4 | Oct 9 – Oct 30 | 28–42 |
| Anemones | Mar 26 | — | Apr 23 | — | May 28 – Jun 25 | 90–120 |
| Astilbe | Feb 19 | — | May 7 | — | Jul 23 – Oct 1 | 70–100 |
| Bachelor's Button | Mar 12 | Apr 2 | Apr 23 | — | Jun 25 – Sep 10 | 60–90 |
| Begonias | Feb 12 | — | Apr 30 | — | Jul 9 – Oct 1 | 70–90 |
| Black-eyed Susan | Feb 19 | Apr 23 | May 7 | — | Jul 23 – Oct 29 | 60–80 |
| Bleeding Hearts | Feb 19 | — | May 7 | — | Jul 2 – Aug 13 | 60–90 |
| Calendula | Mar 12 | Apr 2 | Apr 23 | — | Jun 11 – Sep 10 | 50–70 |
| Celosia | Mar 19 | Apr 30 | Apr 30 | — | Jul 2 – Oct 8 | 60–90 |
| Columbine | Feb 19 | May 7 | May 7 | — | Jul 2 – Aug 13 | 70–100 |
| Coreopsis | Feb 19 | Apr 30 | May 7 | — | Jul 16 – Oct 29 | 60–80 |
| Cosmos | Mar 26 | Apr 23 | Apr 23 | — | Jul 2 – Oct 1 | 60–90 |
| Crocus | — | — | — | Sep 4 | Jul 17 – Aug 7 | 10–20 |
| Daffodils | — | — | — | Sep 4 | Jul 24 – Aug 14 | 20–40 |
| Dahlias | Mar 26 | Apr 30 | Apr 30 | — | Jul 23 – Oct 22 | 70–120 |
| Daylily | Feb 19 | — | May 7 | — | Jul 30 – Oct 29 | 60–90 |
| Dianthus | Feb 19 | Mar 26 | Apr 9 | — | May 28 – Aug 20 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 19 | May 7 | May 7 | — | Jul 30 – Oct 29 | 70–90 |
| Foxglove | Feb 19 | May 7 | May 7 | — | Jul 2 – Aug 13 | 80–120 |
| Gaillardia (Blanket Flower) | Feb 26 | Apr 30 | Apr 30 | — | Jul 9 – Oct 29 | 70–100 |
| Geraniums | Feb 12 | — | Apr 30 | — | Jul 9 – Oct 1 | 70–100 |
| Gladiolus | — | Apr 30 | Apr 30 | — | Jul 23 – Oct 22 | 70–100 |
| Hostas | Feb 12 | — | May 7 | — | Jul 30 – Oct 29 | 60–90 |
| Hyacinths | — | — | — | Sep 4 | Aug 14 – Sep 11 | 14–28 |
| Hydrangeas | Feb 12 | — | May 7 | — | Jul 23 – Oct 15 | 90–150 |
| Impatiens | Feb 26 | — | Apr 30 | — | Jul 9 – Oct 8 | 60–75 |
| Irises | — | Division | May 7 | — | Jul 2 – Aug 6 | 60–100 |
| Larkspur | — | Mar 26 | — | — | Jun 4 – Jul 30 | 60–90 |
| Lavender | Feb 12 | — | May 14 | — | Jul 23 – Sep 10 | 90–120 |
| Lilies | — | Division | May 7 | — | Jul 16 – Oct 15 | 70–120 |
| Lobelia | Feb 12 | — | Apr 16 | — | Jun 11 – Aug 27 | 70–80 |
| Lupine | Feb 19 | May 7 | May 7 | — | Jul 2 – Aug 13 | 75–100 |
| Marigolds | Mar 12 | Apr 30 | Apr 30 | — | Jun 25 – Sep 24 | 50–70 |
| Nasturtium | Mar 26 | Apr 30 | Apr 30 | — | Jun 25 – Oct 8 | 55–65 |
| Pansy | Feb 12 | — | Apr 23 | — | Jun 18 – Aug 20 | 70–90 |
| Peonies | — | Division | May 7 | — | Jul 16 – Aug 27 | 90–120 |
| Petunia | Feb 26 | — | Apr 30 | — | Jul 9 – Oct 8 | 70–90 |
| Phlox | Feb 19 | May 7 | May 7 | — | Jul 23 – Oct 15 | 80–110 |
| Portulaca | Mar 19 | Apr 30 | Apr 30 | — | Jun 18 – Sep 24 | 50–70 |
| Roses | Feb 12 | — | May 7 | — | Jul 23 – Oct 29 | 90–180 |
| Salvia | Feb 19 | — | Apr 30 | — | Jul 9 – Oct 8 | 70–90 |
| Sedum (Stonecrop) | Feb 19 | — | May 7 | — | Sep 3 – Nov 12 | 60–90 |
| Snapdragon | Feb 12 | Apr 9 | Apr 23 | — | Jul 2 – Sep 10 | 70–100 |
| Sunflower | Apr 2 | Apr 30 | Apr 30 | — | Jul 23 – Oct 8 | 70–100 |
| Sweet Alyssum | Mar 5 | Apr 9 | Apr 23 | — | Jun 4 – Aug 13 | 45–60 |
| Sweet Pea | Mar 12 | Mar 19 | Apr 23 | — | Jul 9 – Sep 10 | 65–85 |
| Tulips | — | — | — | Sep 4 | Aug 7 – Aug 28 | 15–30 |
| Vinca (Annual) | Feb 5 | — | Apr 30 | — | Jul 9 – Oct 1 | 70–90 |
| Yarrow | Feb 19 | Apr 23 | May 7 | — | Jul 16 – Oct 29 | 60–90 |
| Zinnia | Mar 26 | Apr 30 | Apr 30 | — | Jul 9 – Oct 8 | 60–70 |
Monthly Planting Guide for Boone County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Boone County.
Frequently Asked Questions
What planting zone is Boone County, IL?
Boone 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 Boone County, IL?
Based on 31 years of NOAA weather station data, the median last spring frost in Boone County falls around April 23. In 8 out of 10 years, last frost lands between April 12 and May 10 — a 27-day window of variability. Use May 10 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Boone County, IL?
The median first fall frost in Boone County arrives around October 16. In cold years it can arrive as early as October 5; in mild years as late as October 30. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Boone County?
Boone County has a frost-free growing season of approximately 176 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 0.82 days per decade.
What is the soil like in Boone County for gardening?
Boone County has predominantly Silt Loam soil with a pH range of 6–6.8 and Excessively Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Boone County?
Boone County has commercial agriculture that includes Soybeans, Corn, Wheat, Hay, Oats. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Boone County a good location for home gardening?
Boone County scores 69/100 (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 Boone County Garden Planner — Free
A 22-page printable planner built for Boone 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