McLean County, IL — Planting Guide
McLean County is in USDA Zone 5a. The average last spring frost is April 18 and the first fall frost is October 18, giving you a growing season of approximately 183 days.
At an elevation of 1,024 ft, McLean County receives approximately 31.9 in of rainfall annually. Summer highs average 86°F with winter lows around 15°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 5 in warm years to May 2 in cold years. The growing season is trending shorter by about 1.8 days per decade. McLean County scores 65/100 (Good) on the Microclimate Index.
🌡️ Zone
5a (-20°F to -15°F min)
❄️ Last Frost
April 18
🍂 First Frost
October 18
📅 Growing Season
183 days
⛰️ Elevation
1,024 ft
🌧️ Annual Rainfall
31.9 in
Monthly Watering Calendar
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.3 in | 7 days | — | None |
| Feb | 1.3 in | 7 days | — | None |
| Mar | 2.5 in | 8 days | — | None |
| Apr | 2.9 in | 10 days | 1.4 in | Moderate |
| May | 4 in | 10 days | 0.3 in | Low |
| Jun | 3.8 in | 10 days | 0.5 in | Low |
| Jul | 3.5 in | 9 days | 0.8 in | Moderate |
| Aug | 3.2 in | 8 days | 1.1 in | Moderate |
| Sep | 2.7 in | 8 days | 1.6 in | High |
| Oct | 2.8 in | 8 days | 1.5 in | Moderate |
| Nov | 2 in | 8 days | — | None |
| Dec | 1.9 in | 7 days | — | None |
Annual total: 31.9 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.
McLean County Soil Profile
Soil Type
Silt Loam
Soil pH
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 2 | Nov 1 | 183 days |
| Cautious | Apr 24 | Oct 27 | 186 days |
| Average year | Apr 18 | Oct 18 | 183 days |
| Optimistic | Apr 14 | Oct 11 | 180 days |
| Aggressive (risky) | Apr 5 | Oct 5 | 183 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 1.8 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
McLean County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in McLean 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 McLean County's climate and soil.
County Extension Office
McLean 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 McLean County
Finding local nurseries & garden centers in McLean County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to McLean 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 McLean County IL" or "garden center McLean 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 McLean County IL" or check your extension office and local parks department. Facebook groups like "McLean 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
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
14.9 hours
Summer solstice daylight
Shortest Day
9.1 hours
Winter solstice daylight
Peak Sun Hours
9.3 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 | 9.4 hr | 3.8 hr | Short day |
| February | 10.4 hr | 4.6 hr | Short day |
| March | 11.7 hr | 5.4 hr | Short day |
| April | 13.1 hr | 7.1 hr | Neutral |
| May | 14.3 hr | 8.7 hr | Long day |
| June | 14.9 hr | 9.2 hr | Long day |
| July | 14.6 hr | 9.3 hr | Long day |
| August | 13.6 hr | 8.5 hr | Neutral |
| September | 12.3 hr | 7.3 hr | Neutral |
| October | 10.9 hr | 5.5 hr | Short day |
| November | 9.7 hr | 3.8 hr | Short day |
| December | 9.1 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 Calendar
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
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 | 31°F | ❄️ Dormant | ~36 weeks |
| Feb | 22°F | 31°F | ❄️ Dormant | ~36 weeks |
| Mar | 34°F | 35°F | ❄️ Dormant | ~36 weeks |
| Apr | 44°F | 45°F | 🐢 Slow | ~24 weeks |
| May | 59°F | 54°F | ♻️ Active | ~14 weeks |
| Jun | 69°F | 64°F | 🔥 Peak | ~8 weeks |
| Jul | 77°F | 72°F | 🔥 Peak | ~8 weeks |
| Aug | 77°F | 72°F | 🔥 Peak | ~8 weeks |
| Sep | 70°F | 70°F | 🔥 Peak | ~8 weeks |
| Oct | 59°F | 61°F | ♻️ Active | ~14 weeks |
| Nov | 41°F | 50°F | 🐢 Slow | ~24 weeks |
| Dec | 31°F | 37°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 McLean County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
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 | Moderate | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
Organic pest management tips
- Maintain healthy soil with regular compost additions to build natural pest resistance
- Practice crop rotation annually to break pest cycles
- Encourage beneficial insects with flowering herbs like dill, fennel, and yarrow
Cover Crops for McLean County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 30 | Aug 9 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 23 | Aug 9 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 22 | Aug 23 | ✓ 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 3 | Sep 20 | — | 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 16 | Mar 28 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 26 | Apr 4 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 6 | Mar 28 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 21 | Mar 28 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 19 | Mar 28 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 16 | Mar 28 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 12 mph Summer: 9 mph
Fall: 9 mph Winter: 13 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.4/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (166 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
15,898 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 1,750 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 31.9 inches of rain per year
- A 1,000 sq ft roof can collect roughly 15,898 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 McLean County
Soil Type
Silt Loam
Soil pH 6–7 · Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 3.5/10
Low-to-moderate drought stress. Plan to water 1–2 times per week during peak summer. (31.9 in. annual rainfall)
Season Tips
183-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.
Free Garden Planner
Plan your entire garden season — organize planting dates, track what you're growing, and know exactly when to start seeds, transplant, and harvest.
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 McLean County
106 vegetables that grow well in Zone 5a with planting dates for McLean County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | 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 | May 23 – Jul 25 | 30–50 |
| Asparagus | — | — | May 2 | — | 730–1095 |
| Beets | — | Apr 4 | — | May 30 – Jun 27 | 50–70 |
| Belgian Endive | Mar 14 | Apr 4 | Apr 18 | 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 | May 30 – Jul 4 | 40–60 |
| Broccoli | Mar 14 | Apr 4 | Apr 18 | Jun 20 – Aug 1 | 60–90 |
| Broccoli Rabe | Mar 14 | Apr 4 | Apr 18 | May 30 – Jul 4 | 40–60 |
| Brussels Sprouts | Mar 14 | Apr 4 | Apr 18 | 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 | Jun 20 – Aug 15 | 60–100 |
| Calabash | Feb 21 | Apr 25 | May 2 | Jul 25 – Sep 19 | 80–120 |
| Carrots | — | Apr 4 | — | Jun 6 – Jul 11 | 60–80 |
| Cauliflower | Mar 14 | Apr 4 | Apr 18 | Jun 13 – Aug 15 | 55–100 |
| Celeriac | Mar 14 | Apr 4 | Apr 18 | Aug 1 – Sep 5 | 100–120 |
| Celery | Mar 14 | Apr 4 | Apr 18 | Jul 11 – Sep 5 | 80–120 |
| Celtuce | Mar 14 | Apr 4 | Apr 18 | Jun 20 – Aug 1 | 60–90 |
| Chard | Mar 14 | Apr 4 | Apr 18 | Jun 13 – Aug 1 | 50–60 |
| Chickpeas | Mar 14 | Apr 4 | Apr 18 | Jul 11 – Aug 22 | 80–110 |
| Chicory | Mar 14 | Apr 4 | Apr 18 | Jun 20 – Aug 1 | 60–85 |
| Chinese Cabbage | Mar 14 | Apr 4 | Apr 18 | 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 | 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 | May 2 – May 23 | 14–21 |
| Crookneck Squash | Mar 14 | Apr 25 | May 2 | Jun 20 – Jul 18 | 45–60 |
| Crosne | — | Apr 4 | — | Sep 5 – Sep 19 | 150–200 |
| Cucumber | Mar 14 | Apr 25 | May 2 | Jun 27 – Aug 22 | 50–70 |
| Daikon | — | Apr 4 | — | 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 | Jun 6 – Jul 11 | 45–65 |
| Escarole | Mar 14 | Apr 4 | Apr 18 | Jun 13 – Jul 11 | 50–70 |
| Fava Beans | Mar 14 | Apr 4 | Apr 18 | Jul 4 – Aug 15 | 75–100 |
| Fennel | Feb 21 | Apr 25 | May 2 | Jul 4 – Aug 15 | 60–90 |
| Garlic | — | — | — | — | 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 | Jun 6 – Jul 4 | 45–60 |
| Kale | Mar 14 | Apr 4 | Apr 18 | Jun 13 – Aug 8 | 50–70 |
| Kidney Beans | — | Apr 25 | — | Jul 25 – Aug 29 | 85–110 |
| Kohlrabi | Mar 14 | Apr 4 | Apr 18 | Jun 6 – Jul 11 | 45–65 |
| Komatsuna | Mar 14 | Apr 4 | Apr 18 | May 23 – Jun 27 | 35–50 |
| Leeks | Mar 14 | Apr 4 | Apr 18 | Jul 18 – Oct 3 | 90–150 |
| Lentils | Mar 14 | Apr 4 | Apr 18 | Jul 11 – Aug 22 | 80–110 |
| Lettuce | Mar 14 | Apr 4 | Apr 18 | May 23 – Aug 1 | 30–60 |
| Lima Beans | — | Apr 25 | — | Jun 27 – Aug 8 | 60–90 |
| Mache | Mar 14 | Apr 4 | Apr 18 | 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 | Apr 25 – May 23 | 7–21 |
| Mitsuba | Mar 14 | Apr 4 | Apr 11 | Jun 6 – Aug 1 | 50–70 |
| Mizuna | Mar 14 | Apr 4 | Apr 18 | May 23 – Jun 20 | 30–45 |
| Mustard Greens | Mar 14 | Apr 4 | Apr 18 | May 23 – Jul 25 | 30–50 |
| Napa Cabbage | Mar 14 | Apr 4 | Apr 18 | 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 | Jul 18 – Sep 5 | 90–120 |
| Pac Choi | Mar 14 | Apr 4 | Apr 18 | May 30 – Jun 27 | 40–55 |
| Parsnip | — | Apr 4 | — | 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 | 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 | May 30 – Jul 4 | 40–60 |
| Radicchio | Mar 14 | Apr 4 | Apr 18 | Jun 20 – Jul 25 | 60–80 |
| Radish | — | Apr 4 | — | May 2 – May 23 | 22–35 |
| Rhubarb | — | — | May 9 | — | 365–730 |
| Romanesco | Mar 14 | Apr 4 | Apr 18 | Jul 4 – Aug 15 | 75–100 |
| Rutabaga | — | Apr 4 | — | Jun 27 – Aug 1 | 80–100 |
| Salsify | — | Apr 4 | — | Jul 18 – Aug 29 | 100–130 |
| Savoy Cabbage | Mar 14 | Apr 4 | Apr 18 | Jun 27 – Aug 22 | 70–110 |
| Scallions | Mar 14 | Apr 4 | Apr 18 | 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 | 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 | 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 | 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 |
| Sunflower | Feb 21 | Apr 25 | May 2 | Jul 11 – Aug 29 | 70–100 |
| 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 | 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 | — | May 16 – Jun 20 | 40–60 |
| Watercress | Mar 14 | Apr 4 | Apr 18 | 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 McLean County
27 fruits that grow well in Zone 5a with planting dates for McLean County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | 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 McLean County
37 herbs that grow well in Zone 5a with planting dates for McLean County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 14 | Apr 4 | Apr 11 | — | 365–730 |
| Anise | Mar 14 | Apr 4 | Apr 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 | Jun 6 – Jul 25 | 50–60 |
| Caraway | Mar 14 | Apr 4 | Apr 11 | — | 365–450 |
| Catnip | — | — | Apr 25 | Jun 27 – Aug 29 | 60–80 |
| Chamomile | Mar 14 | Apr 4 | Apr 11 | Jun 13 – Aug 22 | 60–90 |
| Chervil | Mar 14 | Apr 4 | Apr 11 | May 23 – Jul 25 | 40–60 |
| Chives | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Cilantro | Mar 14 | Apr 4 | Apr 11 | May 23 – Jul 25 | 40–60 |
| Comfrey | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Cumin | Mar 14 | Apr 4 | Apr 11 | Jul 25 – Sep 26 | 100–120 |
| Dill | Mar 14 | Apr 4 | Apr 11 | May 23 – Jul 25 | 40–60 |
| Echinacea | — | — | Apr 25 | Aug 29 – Oct 10 | 120–180 |
| Epazote | Feb 28 | Apr 25 | May 2 | Jun 20 – Aug 15 | 45–60 |
| Fennel (herb) | Mar 14 | Apr 4 | Apr 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 |
| Lavender | — | — | Apr 25 | Jul 25 – Oct 10 | 90–200 |
| 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 | 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 | 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 |
| Yarrow | — | — | Apr 25 | Jul 25 – Oct 10 | 90–120 |
Monthly Planting Guide for McLean County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in McLean County.
Frequently Asked Questions
What planting zone is McLean County, IL?
McLean County is in USDA Hardiness Zone 5a. 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 McLean County, IL?
Based on 31 years of NOAA weather station data, the median last spring frost in McLean County falls around April 18. In 8 out of 10 years, last frost lands between April 5 and May 2 — a 27-day window of variability. Use May 2 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in McLean County, IL?
The median first fall frost in McLean County arrives around October 18. In cold years it can arrive as early as October 5; in mild years as late as November 1. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in McLean County?
McLean County has a frost-free growing season of approximately 183 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 1.8 days per decade.
What is the soil like in McLean County for gardening?
McLean County has predominantly Silt Loam soil with a pH range of 6–7 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in McLean County?
McLean County has commercial agriculture that includes Corn, Soybeans, 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 McLean County a good location for home gardening?
McLean County scores 65/100 (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.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help McLean County gardeners in Zone 5a organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.
