When to plant Sweet Corn in Sumter County, AL
The best window to plant Sweet Corn in Sumter County, is March 28–April 18, when soil warms to 50°F. Last frost typically hits March 21; first frost November 8.
When to Plant Sweet Corn in Sumter County, AL
What to do in July
If you only do a handful of things in the garden this July, make it these. They're sequenced around your zone's frost timing.
Sweet corn is bred for high sugar content in its kernels, which convert to starch rapidly after harvest. Modern supersweet varieties hold their sweetness longer.
Sumter County, Alabama is in USDA Zone 8b. The average last spring frost is March 21 and the first fall frost is November 8, giving you a growing season of approximately 232 days.
At an elevation of 335 feet, Sumter County receives approximately 56.6 inches of rainfall annually with predominantly clay loam soil. Summer highs average 94°F, providing good warmth for Sweet Corn during the growing season. Clay soil retains moisture well for Sweet Corn, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Sweet Corn root diseases.
Sumter County Soil Profile
Soil Type
Clay Loam
Soil pH
5.6-6.2
Drainage
Well Drained
Sweet Corn 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 Sumter County
How your county's soil matches Sweet Corn's growing requirements.
Soil pH
Your soil pH (5.6–6.2) is more acidic than Sweet Corn prefers (6.0–7.0). Add garden lime to raise pH.
Soil Texture
The clay loam soil in Sumter County is excellent for Sweet Corn — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.9%). Annual compost additions will help Sweet Corn.
How to Plant Sweet Corn
Succession Planting Sweet Corn
Sow every 6.9 weeks. Last sowing by Aug 10 to harvest before frost.
Sweet Corn Water Budget
Monthly Watering Guide for Sweet Corn
Sweet Corn needs approximately 1.5 inches of water per week (6.5" per month). Here's how your county's rainfall compares month by month.
| Month | Sweet Corn Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 5" | 0" | ❄️ Dormant |
| Feb | — | 5" | 0" | ❄️ Dormant |
| Mar | 6.5" | 5.2" | 1.3" | 💧 Light watering |
| Apr | 6.5" | 4.7" | 1.8" | 💧 Light watering |
| May | 6.5" | 4.6" | 1.9" | 💧 Light watering |
| Jun | 6.5" | 4.9" | 1.6" | 💧 Light watering |
| Jul | 6.5" | 5.2" | 1.3" | 💧 Light watering |
| Aug | 6.5" | 5.9" | 0.6" | 💧 Light watering |
| Sep | 6.5" | 4" | 2.5" | 💧 Light watering |
| Oct | 6.5" | 3.7" | 2.8" | 💧 Light watering |
| Nov | 6.5" | 4" | 2.5" | 💧 Light watering |
| Dec | — | 4.5" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Sumter County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Sweet Corn 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.
Sweet Corn Planting Timeline — Sumter County, AL
Sweet Corn Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | March 28 | Mar 28 – Apr 18 |
| Harvest | May 30 | May 30 – Jul 11 |
Plant 1" deep · 12" apart · Rows 36" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Direct Sow |
| April | Direct Sow |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1.5"/week · 1-2 times/week
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: too_acidic
🗺️ USDA Zone
Zone 8b
📆 Growing Season
232 days in Sumter County
Growing Tips for Sweet Corn in Sumter County
Direct sow Sweet Corn outdoors after March 21 in Sumter County when soil has warmed and frost danger has passed.
With Sumter County's clay soil (32% clay), work in 3-4 inches of compost before planting Sweet Corn. Avoid tilling when soil is wet to prevent compaction.
Common pests for Sweet Corn in this region include corn earworm and corn borers. Use row covers early in the season and inspect plants weekly.
General growing tips
Plant in blocks of at least 4 rows for wind pollination. Direct sow after soil is warm. Isolate supersweet varieties from other corn types to prevent cross-pollination.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Sweet Corn in Other Locations
Frequently Asked Questions
When should I plant Sweet Corn in Sumter County, AL?
Sumter County is in Zone 8b with an average last frost of March 21. Plan your Sweet Corn planting based on this frost date — see the calendar above for exact timing.
What planting zone is Sumter County, AL?
Sumter County, Alabama is in USDA Hardiness Zone 8b. The average last spring frost is March 21 and first fall frost is November 8.
When should I plant Sweet Corn in Sumter County, AL?
In Sumter County, AL, plant Sweet Corn after the last frost (around March 21) and before the first frost (around November 8). Best results when soil holds above 50°F.
What growing zone is Sumter County, AL for Sweet Corn?
Sumter County sits in USDA Zone 8b. Sweet Corn grows reliably in zones 3a through 11b, so it's a good fit here.
Can Sweet Corn grow in Sumter County's climate?
Yes — Sweet Corn grows well in Sumter County's temperate climate. Sumter County averages a 232-day frost-free season, with last frost around March 21 and first frost around November 8.
Your Sumter County Garden Planner — Free
A 22-page printable planner built for Sumter County (Zone 8b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.