When to plant Zucchini in Dewitt, IL
In Dewitt, plant Zucchini in spring between April 22 and May 13, once soil temps hold above 50°F. Dewitt's last frost averages April 15, so time plantings around the expected last-frost window for best survival. For a fall crop, sow between and — roughly 45–60 days before the first frost on October 17.
When to Plant Zucchini in Dewitt, IL
This month in DeWitt County, Illinois
Your garden in DeWitt County, Illinois is working on a schedule, even when you're not. Here's where you should be this July.
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Harvest zucchini as they ripen
Taste as you pick. The first ripe produce is the best feedback loop you'll get all season.
To set up a strong August, finish these tasks
- First harvests: zucchini
Zucchini is an incredibly prolific summer squash that can produce an abundance of fruit from just a few plants. It is versatile in the kitchen from grilling to baking.
Dewitt, Illinois is in USDA Zone 6a. The average last spring frost is April 15 and the first fall frost is October 17, giving you a growing season of approximately 185 days.
At an elevation of 801 feet, DeWitt County receives approximately 31.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 84°F, so choose short-season varieties of Zucchini to ensure they mature before fall.
Dewitt Soil Profile
Soil Type
Silt Loam
Soil pH
6.1-7
Drainage
Well Drained
Zucchini 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 Dewitt
How your county's soil matches Zucchini's growing requirements.
Soil pH
Your soil pH (6.1–7.0) is within Zucchini's preferred range (6.0–7.5).
Soil Texture
The silt loam soil in DeWitt County is excellent for Zucchini — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Zucchini.
Organic Matter
Organic matter is excellent (5.0%) — Zucchini will thrive.
How to Plant Zucchini
Succession Planting Zucchini
Sow every 5.1 weeks. Last sowing by Aug 18 to harvest before frost.
Zucchini Water Budget
Monthly Watering Guide for Zucchini
Zucchini needs approximately 1.2 inches of water per week (5.2" per month). Here's how your county's rainfall compares month by month.
| Month | Zucchini Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.4" | 0" | ❄️ Dormant |
| Feb | — | 1.2" | 0" | ❄️ Dormant |
| Mar | — | 2.3" | 0" | ❄️ Dormant |
| Apr | 5.2" | 2.6" | 2.6" | 🚿 Regular watering |
| May | 5.2" | 4.1" | 1.1" | 💧 Light watering |
| Jun | 5.2" | 4.3" | 0.9" | 💧 Light watering |
| Jul | 5.2" | 3.2" | 2" | 💧 Light watering |
| Aug | 5.2" | 3.6" | 1.6" | 💧 Light watering |
| Sep | 5.2" | 2.7" | 2.5" | 💧 Light watering |
| Oct | 5.2" | 2.3" | 2.9" | 🚿 Regular watering |
| Nov | — | 2.1" | 0" | ❄️ Dormant |
| Dec | — | 2" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in DeWitt County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Zucchini 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.
Zucchini Planting Timeline — Dewitt, IL
Zucchini Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 11 | Mar 11 – Mar 25 |
| Transplant Outdoors | April 29 | Apr 29 – May 13 |
| Direct Sow | April 22 | Apr 22 – May 13 |
| Harvest | June 17 | Jun 17 – Aug 12 |
Plant 1" deep · 30" apart · Rows 42" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Transplant Outdoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | Harvest |
| July | Harvest |
| August | Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1.2"/week · 2-3 times/week
📅 Days to Maturity
45–60 days
🧪 Soil pH
Needs 6–7.5 · Your soil: ideal
🗺️ USDA Zone
Zone 6a
📆 Growing Season
185 days in DeWitt County
Growing Tips for Zucchini in Dewitt
Direct sow Zucchini outdoors after April 15 in DeWitt County when soil has warmed and frost danger has passed.
Your generous 185.0-day season in DeWitt County allows multiple plantings of Zucchini. Sow every 22.0 days for continuous harvest.
Common pests for Zucchini in this region include squash vine borer and cucumber beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow after last frost. Harvest when fruits are 6-8 inches long for best flavor and texture. Check plants daily in summer as fruits can double in size overnight.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Zucchini in Other Locations
When should I plant Zucchini in Dewitt, IL?
In Dewitt, IL, plant Zucchini after the last frost (around April 15) and before the first frost (around October 17). Best results when soil holds above 50°F.
What growing zone is Dewitt, IL for Zucchini?
Dewitt sits in USDA Zone 6a. Zucchini grows reliably in zones 3a through 11b, so it's a good fit here.
Can Zucchini grow in Dewitt's climate?
Yes — Zucchini grows well in Dewitt's temperate climate. Dewitt averages a 185-day frost-free season, with last frost around April 15 and first frost around October 17.
Your DeWitt County Garden Planner — Free
A 22-page printable planner built for DeWitt County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.