Douglas County, IL — Planting Guide
Douglas County is in USDA Zone 5b. The average last spring frost is April 14 and the first fall frost is October 17, giving you a growing season of approximately 186 days.
At an elevation of 1,036 ft, Douglas County receives approximately 30.9 in of rainfall annually. Summer highs average 87°F with winter lows around 19°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 24 days year to year — ranging from April 4 in warm years to April 28 in cold years. The growing season is trending shorter by about 4.96 days per decade. Douglas County scores 59/100 (Moderate) on the Microclimate Index.
🌡️ Zone
5b (-15°F to -10°F min)
❄️ Last Frost
April 14
🍂 First Frost
October 17
📅 Growing Season
186 days
⛰️ Elevation
1,036 ft
🌧️ Annual Rainfall
30.9 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 | 1.5 in | 8 days | — | None |
| Feb | 1.6 in | 6 days | — | None |
| Mar | 1.9 in | 8 days | — | None |
| Apr | 2.9 in | 10 days | 1.4 in | Moderate |
| May | 3.6 in | 11 days | 0.7 in | Moderate |
| Jun | 3.6 in | 10 days | 0.7 in | Moderate |
| Jul | 3.7 in | 10 days | 0.6 in | Moderate |
| Aug | 3 in | 8 days | 1.3 in | Moderate |
| Sep | 2.9 in | 6 days | 1.4 in | Moderate |
| Oct | 2.6 in | 7 days | 1.7 in | High |
| Nov | 1.9 in | 8 days | — | None |
| Dec | 1.7 in | 8 days | — | None |
Annual total: 30.9 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.
Douglas County Soil Profile
Soil Type
Silt Loam
Soil pH
6.2-7.2
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) | Apr 28 | Oct 31 | 186 days |
| Cautious | Apr 19 | Oct 27 | 191 days |
| Average year | Apr 14 | Oct 17 | 186 days |
| Optimistic | Apr 9 | Oct 12 | 186 days |
| Aggressive (risky) | Apr 4 | Oct 6 | 185 days |
Not very — frost dates can vary by ±24 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 5 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Douglas County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Douglas 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 Douglas County's climate and soil.
County Extension Office
Douglas 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 Douglas County
Finding local nurseries & garden centers in Douglas County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Douglas 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 Douglas County IL" or "garden center Douglas 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 Douglas County IL" or check your extension office and local parks department. Facebook groups like "Douglas 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
14.8 hours
Summer solstice daylight
Shortest Day
9.2 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 | 9.5 hr | 3.9 hr | Short day |
| February | 10.5 hr | 4.8 hr | Short day |
| March | 11.7 hr | 5.8 hr | Short day |
| April | 13.1 hr | 6.7 hr | Neutral |
| May | 14.2 hr | 7.9 hr | Long day |
| June | 14.8 hr | 9 hr | Long day |
| July | 14.6 hr | 9.3 hr | Long day |
| August | 13.6 hr | 8.7 hr | Neutral |
| September | 12.2 hr | 7 hr | Neutral |
| October | 10.9 hr | 5.8 hr | Short day |
| November | 9.8 hr | 3.8 hr | Short day |
| December | 9.2 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 | 24°F | 32°F | ❄️ Dormant | ~36 weeks |
| Feb | 25°F | 30°F | ❄️ Dormant | ~36 weeks |
| Mar | 30°F | 35°F | ❄️ Dormant | ~36 weeks |
| Apr | 45°F | 45°F | 🐢 Slow | ~24 weeks |
| May | 58°F | 56°F | ♻️ Active | ~14 weeks |
| Jun | 68°F | 64°F | 🔥 Peak | ~8 weeks |
| Jul | 78°F | 72°F | 🔥 Peak | ~8 weeks |
| Aug | 77°F | 73°F | 🔥 Peak | ~8 weeks |
| Sep | 71°F | 68°F | 🔥 Peak | ~8 weeks |
| Oct | 58°F | 60°F | ♻️ Active | ~14 weeks |
| Nov | 41°F | 49°F | 🐢 Slow | ~24 weeks |
| Dec | 29°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 Douglas 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 | Low | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Low | 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 Douglas 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 20 | Aug 8 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 18 | Aug 22 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 16 | Aug 8 | ✓ 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 | Sep 26 | — | 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 11 | Mar 24 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 20 | Mar 31 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 29 | Mar 24 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 7 | Mar 24 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 28 | Mar 24 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 15 | Mar 31 | — | 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: 13 mph Summer: 10 mph
Fall: 11 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
6.5/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (156 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
15,400 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 30.9 inches of rain per year
- A 1,000 sq ft roof can collect roughly 15,400 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 Douglas County
Soil Type
Silt Loam
Soil pH 6.2–7.2 · 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
186-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 Douglas County
106 vegetables that grow well in Zone 5b with planting dates for Douglas County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 10 | Apr 21 | Apr 28 | Jul 21 – Aug 25 | 80–100 |
| Amaranth | Feb 17 | Apr 21 | Apr 28 | Jul 28 – Sep 15 | 90–120 |
| Arugula | Mar 10 | Mar 31 | Apr 14 | May 19 – Jul 21 | 30–50 |
| Asparagus | — | — | Apr 28 | — | 730–1095 |
| Beets | — | Mar 31 | — | May 26 – Jun 23 | 50–70 |
| Belgian Endive | Mar 10 | Mar 31 | Apr 14 | Aug 4 – Sep 29 | 110–150 |
| Bitter Melon | Feb 17 | Apr 21 | Apr 28 | Jun 30 – Aug 11 | 60–90 |
| Black Beans | — | Apr 21 | — | Jul 21 – Sep 8 | 90–120 |
| Bok Choy | Mar 10 | Mar 31 | Apr 14 | May 26 – Jun 30 | 40–60 |
| Broccoli | Mar 10 | Mar 31 | Apr 14 | Jun 16 – Jul 28 | 60–90 |
| Broccoli Rabe | Mar 10 | Mar 31 | Apr 14 | May 26 – Jun 30 | 40–60 |
| Brussels Sprouts | Mar 10 | Mar 31 | Apr 14 | Jul 14 – Sep 8 | 90–130 |
| Butternut Squash | Mar 10 | Apr 21 | Apr 28 | Jul 28 – Sep 1 | 85–110 |
| Cabbage | Mar 10 | Mar 31 | Apr 14 | Jun 16 – Aug 11 | 60–100 |
| Calabash | Feb 17 | Apr 21 | Apr 28 | Jul 21 – Sep 15 | 80–120 |
| Carrots | — | Mar 31 | — | Jun 2 – Jul 7 | 60–80 |
| Cauliflower | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Aug 11 | 55–100 |
| Celeriac | Mar 10 | Mar 31 | Apr 14 | Jul 28 – Sep 1 | 100–120 |
| Celery | Mar 10 | Mar 31 | Apr 14 | Jul 7 – Sep 1 | 80–120 |
| Celtuce | Mar 10 | Mar 31 | Apr 14 | Jun 16 – Jul 28 | 60–90 |
| Chard | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Jul 28 | 50–60 |
| Chickpeas | Mar 10 | Mar 31 | Apr 14 | Jul 7 – Aug 18 | 80–110 |
| Chicory | Mar 10 | Mar 31 | Apr 14 | Jun 16 – Jul 28 | 60–85 |
| Chinese Cabbage | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Jul 7 | 50–70 |
| Christmas Lima Beans | Feb 17 | Apr 21 | Apr 28 | Jul 21 – Aug 25 | 80–100 |
| Collard Greens | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Aug 11 | 55–75 |
| Corn | — | Apr 21 | — | Jun 23 – Aug 18 | 60–100 |
| Cowpeas | — | Apr 21 | — | Jun 23 – Aug 4 | 60–90 |
| Cress | Mar 10 | Mar 31 | Apr 14 | Apr 28 – May 19 | 14–21 |
| Crookneck Squash | Mar 10 | Apr 21 | Apr 28 | Jun 16 – Jul 14 | 45–60 |
| Crosne | — | Mar 31 | — | Sep 1 – Sep 15 | 150–200 |
| Cucumber | Mar 10 | Apr 21 | Apr 28 | Jun 23 – Aug 18 | 50–70 |
| Daikon | — | Mar 31 | — | May 26 – Jun 23 | 50–70 |
| Delicata Squash | Mar 10 | Apr 21 | Apr 28 | Jul 21 – Aug 25 | 80–100 |
| Edamame | — | Apr 21 | — | Jul 7 – Aug 18 | 75–100 |
| Eggplant | Feb 3 | Apr 21 | Apr 28 | Jul 7 – Sep 8 | 65–85 |
| Endive | Mar 10 | Mar 31 | Apr 14 | Jun 2 – Jul 7 | 45–65 |
| Escarole | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Jul 7 | 50–70 |
| Fava Beans | Mar 10 | Mar 31 | Apr 14 | Jun 30 – Aug 11 | 75–100 |
| Fennel | Feb 17 | Apr 21 | Apr 28 | Jun 30 – Aug 11 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Apr 21 | — | Jun 16 – Aug 11 | 50–65 |
| Horseradish | — | — | Apr 28 | Sep 1 – Oct 13 | 120–180 |
| Hot Peppers | Feb 3 | Apr 21 | Apr 28 | Jul 7 – Oct 13 | 70–120 |
| Hubbard Squash | Mar 10 | Apr 21 | Apr 28 | Aug 11 – Sep 15 | 100–120 |
| Kabocha | Mar 10 | Apr 21 | Apr 28 | Jul 28 – Aug 25 | 85–100 |
| Kai Lan | Mar 10 | Mar 31 | Apr 14 | Jun 2 – Jun 30 | 45–60 |
| Kale | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Aug 4 | 50–70 |
| Kidney Beans | — | Apr 21 | — | Jul 21 – Aug 25 | 85–110 |
| Kohlrabi | Mar 10 | Mar 31 | Apr 14 | Jun 2 – Jul 7 | 45–65 |
| Komatsuna | Mar 10 | Mar 31 | Apr 14 | May 19 – Jun 23 | 35–50 |
| Leeks | Mar 10 | Mar 31 | Apr 14 | Jul 14 – Sep 29 | 90–150 |
| Lentils | Mar 10 | Mar 31 | Apr 14 | Jul 7 – Aug 18 | 80–110 |
| Lettuce | Mar 10 | Mar 31 | Apr 14 | May 19 – Jul 28 | 30–60 |
| Lima Beans | — | Apr 21 | — | Jun 23 – Aug 4 | 60–90 |
| Mache | Mar 10 | Mar 31 | Apr 14 | May 26 – Jun 30 | 40–60 |
| Melon | Mar 10 | Apr 21 | Apr 28 | Jul 7 – Aug 25 | 70–100 |
| Microgreens | Mar 10 | Mar 31 | Apr 14 | Apr 21 – May 19 | 7–21 |
| Mitsuba | Mar 10 | Mar 31 | Apr 7 | Jun 2 – Jul 28 | 50–70 |
| Mizuna | Mar 10 | Mar 31 | Apr 14 | May 19 – Jun 16 | 30–45 |
| Mustard Greens | Mar 10 | Mar 31 | Apr 14 | May 19 – Jul 21 | 30–50 |
| Napa Cabbage | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Jul 14 | 55–75 |
| New Zealand Spinach | Feb 17 | Apr 21 | Apr 28 | Jun 23 – Jul 21 | 55–70 |
| Okra | Feb 17 | Apr 21 | Apr 28 | Jun 23 – Aug 18 | 50–65 |
| Onion | Mar 10 | Mar 31 | Apr 14 | Jul 14 – Sep 1 | 90–120 |
| Pac Choi | Mar 10 | Mar 31 | Apr 14 | May 26 – Jun 23 | 40–55 |
| Parsnip | — | Mar 31 | — | Jul 14 – Aug 25 | 100–130 |
| Patty Pan Squash | Mar 10 | Apr 21 | Apr 28 | Jun 16 – Jul 14 | 45–60 |
| Peas | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Aug 4 | 55–70 |
| Peppers | Feb 3 | Apr 21 | Apr 28 | Jun 30 – Sep 8 | 60–90 |
| Pole Beans | Feb 17 | Apr 21 | Apr 28 | Jun 23 – Aug 18 | 55–70 |
| Potatoes | Feb 17 | Apr 21 | Apr 28 | Jul 7 – Sep 15 | 70–120 |
| Pumpkin | Mar 10 | Apr 21 | Apr 28 | Jul 28 – Sep 15 | 85–120 |
| Purslane | Mar 10 | Mar 31 | Apr 14 | May 26 – Jun 30 | 40–60 |
| Radicchio | Mar 10 | Mar 31 | Apr 14 | Jun 16 – Jul 21 | 60–80 |
| Radish | — | Mar 31 | — | Apr 28 – May 19 | 22–35 |
| Rhubarb | — | — | May 5 | — | 365–730 |
| Romanesco | Mar 10 | Mar 31 | Apr 14 | Jun 30 – Aug 11 | 75–100 |
| Rutabaga | — | Mar 31 | — | Jun 23 – Jul 28 | 80–100 |
| Salsify | — | Mar 31 | — | Jul 14 – Aug 25 | 100–130 |
| Savoy Cabbage | Mar 10 | Mar 31 | Apr 14 | Jun 23 – Aug 18 | 70–110 |
| Scallions | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Jul 7 | 50–70 |
| Scarlet Runner Beans | Feb 17 | Apr 21 | Apr 28 | Jun 30 – Aug 4 | 60–80 |
| Shallot | Mar 10 | Mar 31 | Apr 14 | Jul 14 – Sep 1 | 90–120 |
| Shiso | Feb 24 | Apr 21 | Apr 28 | Jun 23 – Aug 18 | 50–70 |
| Snap Peas | Feb 17 | Apr 21 | Apr 28 | Jun 23 – Aug 18 | 55–70 |
| Snow Peas | Mar 10 | Mar 31 | Apr 14 | Jun 9 – Aug 4 | 50–65 |
| Soybeans | — | Apr 21 | — | Jul 14 – Sep 8 | 80–120 |
| Spaghetti Squash | Mar 10 | Apr 21 | Apr 28 | Jul 28 – Aug 25 | 85–100 |
| Spinach | Mar 10 | Mar 31 | Apr 14 | May 19 – Jul 21 | 35–50 |
| Squash (Summer) | Mar 10 | Apr 21 | Apr 28 | Jun 16 – Aug 18 | 45–65 |
| Squash (Winter) | Mar 10 | Apr 21 | Apr 28 | Jul 21 – Sep 15 | 80–120 |
| Sunchoke | — | — | Apr 28 | Aug 18 – Oct 13 | 110–150 |
| Sunflower | Feb 17 | Apr 21 | Apr 28 | Jul 7 – Aug 25 | 70–100 |
| Sweet Corn | — | Apr 21 | — | Jun 23 – Aug 4 | 60–90 |
| Sweet Potatoes | Feb 17 | Apr 21 | Apr 28 | Jul 28 – Sep 15 | 90–120 |
| Tatsoi | Mar 10 | Mar 31 | Apr 14 | May 19 – Jun 23 | 35–50 |
| Tomatillo | Feb 17 | Apr 21 | Apr 28 | Jun 30 – Sep 8 | 60–85 |
| Tomatoes | Feb 17 | Apr 21 | Apr 28 | Jun 30 – Sep 8 | 60–85 |
| Turnip | — | Mar 31 | — | May 12 – Jun 16 | 40–60 |
| Watercress | Mar 10 | Mar 31 | Apr 14 | May 26 – Jun 30 | 40–60 |
| Watermelon | Mar 10 | Apr 21 | Apr 28 | Jul 7 – Aug 25 | 70–100 |
| Wax Beans | — | Apr 21 | — | Jun 16 – Aug 11 | 50–65 |
| Winter Melon | Feb 17 | Apr 21 | Apr 28 | Jul 28 – Sep 15 | 90–120 |
| Yard Long Beans | Feb 17 | Apr 21 | Apr 28 | Jun 23 – Aug 4 | 55–80 |
| Zucchini | Mar 10 | Apr 21 | Apr 28 | Jun 16 – Aug 11 | 45–60 |
🍓 Fruits to Grow in Douglas County
27 fruits that grow well in Zone 5b with planting dates for Douglas County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 5 | Aug 4 – Oct 20 | 90–180 |
| Aronia | — | — | May 5 | — | 730–1095 |
| Blackberries | — | — | May 5 | — | 365–730 |
| Blueberries | — | — | May 5 | — | 730–1095 |
| Boysenberries | — | — | May 5 | — | 365–730 |
| Cantaloupe | — | — | May 5 | Jul 14 – Aug 18 | 70–90 |
| Che Fruit | — | — | May 5 | — | 1095–1825 |
| Cranberries | — | — | May 5 | — | 730–1095 |
| Currants | — | — | May 5 | — | 730–1095 |
| Elderberries | — | — | May 5 | — | 730–1095 |
| Goji Berries | — | — | May 5 | — | 730–1095 |
| Gooseberries | — | — | May 5 | — | 730–1095 |
| Grapes | — | — | May 5 | — | 730–1095 |
| Ground Cherry | — | — | May 5 | Jul 14 – Sep 8 | 65–80 |
| Hardy Kiwi | — | — | May 5 | — | 1095–1825 |
| Haskaps | — | — | May 5 | — | 730–1095 |
| Honeydew | — | — | May 5 | Jul 28 – Sep 8 | 80–110 |
| Jostaberry | — | — | May 5 | — | 730–1095 |
| Lingonberries | — | — | May 5 | — | 730–1095 |
| Medlar | — | — | May 5 | — | 1095–1825 |
| Mulberries | — | — | May 5 | — | 730–1825 |
| Pawpaw | — | — | May 5 | — | 1095–2555 |
| Persimmon | — | — | May 5 | — | 1095–2555 |
| Quince | — | — | May 5 | — | 1095–1825 |
| Raspberries | — | — | May 5 | — | 365–730 |
| Serviceberries | — | — | May 5 | — | 730–1095 |
| Strawberries | — | — | May 5 | Aug 4 – Oct 20 | 90–365 |
🌿 Herbs to Grow in Douglas County
37 herbs that grow well in Zone 5b with planting dates for Douglas County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 10 | Mar 31 | Apr 7 | — | 365–730 |
| Anise | Mar 10 | Mar 31 | Apr 7 | Jul 7 – Sep 22 | 90–120 |
| Basil | Feb 24 | Apr 21 | Apr 28 | Jun 23 – Aug 25 | 50–75 |
| Bee Balm | — | — | Apr 21 | Jul 21 – Oct 6 | 90–120 |
| Borage | Mar 10 | Mar 31 | Apr 7 | Jun 2 – Jul 21 | 50–60 |
| Caraway | Mar 10 | Mar 31 | Apr 7 | — | 365–450 |
| Catnip | — | — | Apr 21 | Jun 23 – Aug 25 | 60–80 |
| Chamomile | Mar 10 | Mar 31 | Apr 7 | Jun 9 – Aug 18 | 60–90 |
| Chervil | Mar 10 | Mar 31 | Apr 7 | May 19 – Jul 21 | 40–60 |
| Chives | — | — | Apr 21 | Jun 23 – Sep 1 | 60–90 |
| Cilantro | Mar 10 | Mar 31 | Apr 7 | May 19 – Jul 21 | 40–60 |
| Comfrey | — | — | Apr 21 | Jun 23 – Sep 1 | 60–90 |
| Cumin | Mar 10 | Mar 31 | Apr 7 | Jul 21 – Sep 22 | 100–120 |
| Dill | Mar 10 | Mar 31 | Apr 7 | May 19 – Jul 21 | 40–60 |
| Echinacea | — | — | Apr 21 | Aug 25 – Oct 6 | 120–180 |
| Epazote | Feb 24 | Apr 21 | Apr 28 | Jun 16 – Aug 11 | 45–60 |
| Fennel (herb) | Mar 10 | Mar 31 | Apr 7 | Jun 9 – Aug 18 | 60–90 |
| Feverfew | — | — | Apr 21 | Jul 21 – Oct 6 | 90–120 |
| Garlic Chives | — | — | Apr 21 | Jun 23 – Sep 1 | 60–90 |
| Horehound | — | — | Apr 21 | Jul 7 – Sep 1 | 75–90 |
| Hyssop | — | — | Apr 21 | Jun 30 – Sep 1 | 70–90 |
| Lavender | — | — | Apr 21 | Jul 21 – Oct 6 | 90–200 |
| Lemon Balm | — | — | Apr 21 | Jun 23 – Aug 11 | 60–70 |
| Lemon Thyme | — | — | Apr 21 | Jun 30 – Sep 1 | 70–90 |
| Lovage | — | — | Apr 21 | Jun 30 – Sep 1 | 70–90 |
| Mint | — | — | Apr 21 | Jun 23 – Sep 1 | 60–90 |
| Oregano | — | — | Apr 21 | Jun 23 – Sep 1 | 60–90 |
| Parsley | Mar 10 | Mar 31 | Apr 7 | Jun 9 – Aug 11 | 60–80 |
| Rue | — | — | Apr 21 | Jun 30 – Sep 1 | 70–90 |
| Sage | — | — | Apr 21 | Jul 7 – Sep 1 | 75–90 |
| Savory | — | — | Apr 21 | Jun 16 – Aug 11 | 50–70 |
| Sorrel | Mar 10 | Mar 31 | Apr 7 | May 19 – Jul 21 | 40–60 |
| Tarragon | — | — | Apr 21 | Jun 23 – Sep 1 | 60–90 |
| Thai Basil | Feb 24 | Apr 21 | Apr 28 | Jun 23 – Aug 25 | 50–75 |
| Thyme | — | — | Apr 21 | Jun 30 – Sep 1 | 70–90 |
| Valerian | — | — | Apr 21 | Aug 25 – Oct 6 | 120–180 |
| Yarrow | — | — | Apr 21 | Jul 21 – Oct 6 | 90–120 |
Monthly Planting Guide for Douglas County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Douglas County.
Frequently Asked Questions
What planting zone is Douglas County, IL?
Douglas 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 Douglas County, IL?
Based on 31 years of NOAA weather station data, the median last spring frost in Douglas County falls around April 14. In 8 out of 10 years, last frost lands between April 4 and April 28 — a 24-day window of variability. Use April 28 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Douglas County, IL?
The median first fall frost in Douglas County arrives around October 17. In cold years it can arrive as early as October 6; in mild years as late as October 31. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Douglas County?
Douglas County has a frost-free growing season of approximately 186 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 4.96 days per decade.
What is the soil like in Douglas County for gardening?
Douglas County has predominantly Silt Loam soil with a pH range of 6.2–7.2 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Douglas County?
Douglas County has commercial agriculture that includes Corn, Soybeans, Hay. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Douglas County a good location for home gardening?
Douglas 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.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Douglas County gardeners in Zone 5b 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.
