When to plant Eggplant in Marion County, IL
For Marion County, gardeners: plant Eggplant April 17 through May 8 once soil reads 50°F.
When to Plant Eggplant in Marion County, IL
Your July gardening checklist
Your garden in Marion County, Illinois is working on a schedule, even when you're not. Here's where you should be this July.
-
Harvest eggplant as they ripen
If you can't use it all right away, check the food-preservation section of your planner.
August prep starts now
- First harvests: eggplant
Eggplant is a heat-loving solanaceous crop that produces glossy fruits in purple, white, or striped varieties. It requires long, warm growing seasons for best production.
Marion County, Illinois is in USDA Zone 6b. The average last spring frost is April 10 and the first fall frost is October 19, giving you a growing season of approximately 192 days.
At an elevation of 964 feet, Marion County receives approximately 40.5 inches of rainfall annually with predominantly silt loam soil. Summer highs average 89°F, providing good warmth for Eggplant during the growing season.
Marion County Soil Profile
Soil Type
Silt Loam
Soil pH
6.1-7
Drainage
Well Drained
Eggplant Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in Marion County
How your county's soil matches Eggplant's growing requirements.
Soil pH
Your soil pH (6.1–7.0) is within Eggplant's preferred range (5.5–7.0).
Soil Texture
The silt loam soil in Marion County is excellent for Eggplant — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Eggplant.
Organic Matter
Organic matter is excellent (4.4%) — Eggplant will thrive.
How to Plant Eggplant
Succession Planting Eggplant
Sow every 7.4 weeks. Last sowing by Jul 26 to harvest before frost.
Eggplant Water Budget
Monthly Watering Guide for Eggplant
Eggplant needs approximately 1.1 inches of water per week (4.8" per month). Here's how your county's rainfall compares month by month.
| Month | Eggplant Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.7" | 0" | ❄️ Dormant |
| Feb | — | 1.7" | 0" | ❄️ Dormant |
| Mar | — | 2.7" | 0" | ❄️ Dormant |
| Apr | 4.8" | 3.4" | 1.4" | 💧 Light watering |
| May | 4.8" | 5" | 0" | ✅ Rainfall sufficient |
| Jun | 4.8" | 5.2" | 0" | ✅ Rainfall sufficient |
| Jul | 4.8" | 3.8" | 1" | 💧 Light watering |
| Aug | 4.8" | 4.7" | 0.1" | 💧 Light watering |
| Sep | 4.8" | 3.3" | 1.5" | 💧 Light watering |
| Oct | 4.8" | 3.3" | 1.5" | 💧 Light watering |
| Nov | — | 3.1" | 0" | ❄️ Dormant |
| Dec | — | 2.4" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Marion County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Eggplant Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Eggplant Planting Timeline — Marion County, IL
Eggplant Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 30 | Jan 30 – Feb 13 |
| Transplant Outdoors | April 24 | Apr 24 – May 8 |
| Direct Sow | April 17 | Apr 17 – May 8 |
| Harvest | July 3 | Jul 3 – Sep 4 |
Plant 1" deep · 30" apart · Rows 42" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Start Indoors |
| March | — |
| April | Transplant Outdoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1.1"/week · 1-2 times/week
📅 Days to Maturity
65–85 days
🧪 Soil pH
Needs 5.5–7 · Your soil: ideal
🗺️ USDA Zone
Zone 6b
📆 Growing Season
192 days in Marion County
Growing Tips for Eggplant in Marion County
Direct sow Eggplant outdoors after April 10 in Marion County when soil has warmed and frost danger has passed.
Common pests for Eggplant in this region include tomato hornworm and aphids. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 8-10 weeks before last frost. Transplant only after nighttime temperatures stay above 55F. Mulch to retain moisture and warmth around roots.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Eggplant in Other Locations
Frequently Asked Questions
When should I plant Eggplant in Marion County, IL?
Marion County is in Zone 6b with an average last frost of April 10. Plan your Eggplant planting based on this frost date — see the calendar above for exact timing.
What planting zone is Marion County, IL?
Marion County, Illinois is in USDA Hardiness Zone 6b. The average last spring frost is April 10 and first fall frost is October 19.
When should I plant Eggplant in Marion County, IL?
In Marion County, IL, plant Eggplant after the last frost (around April 10) and before the first frost (around October 19). Best results when soil holds above 50°F.
What growing zone is Marion County, IL for Eggplant?
Marion County sits in USDA Zone 6b. Eggplant grows reliably in zones 5a through 11b, so it's a good fit here.
Can Eggplant grow in Marion County's climate?
Yes — Eggplant grows well in Marion County's temperate climate. Marion County averages a 192-day frost-free season, with last frost around April 10 and first frost around October 19.
Your Marion County Garden Planner — Free
A 22-page printable planner built for Marion County (Zone 6b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.