When to plant watermelons in Alabama
Alabama’s average last spring frost is March 25, and the first fall frost typically arrives around November 5 — about 225 frost-free days (USDA zones 7b, 8a, 8b, 9a). Watermelon needs 70–100 days to mature, which fits comfortably within Alabama's growing season.
When to plant watermelons in Alabama: the short answer
For a spring planting, plant out Apr 1 – Apr 18, with seeds started indoors Feb 25 – Mar 11. Wait until the soil is at least 70°F and frost is over.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow watermelons in Alabama, step by step
- Start seeds indoors (Feb 25 – Mar 11). Sow seeds 1 inch deep in seed-starting mix under bright light. They take 4-10 days to sprout, fastest in soil around 85°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. They need at least six to eight hours of direct sun a day and loose soil at least 24 inches deep, with a pH between 5.5 and 6.8. Dig in compost before planting.
- Plant out (Apr 1 – Apr 18). Space plants about 36 inches apart in rows 72 inches apart. It is killed by frost, so nothing goes outside until the danger has passed.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: striped cucumber beetle, aphids, squash vine borer. Diseases and disorders: anthracnose, fusarium wilt, powdery mildew, gummy stem blight.
- Harvest (from about Jun 17 – Jul 17). Watermelon takes 70-100 days to reach harvest. Longest-season cucurbit here - icebox varieties (70-75 days) are the realistic choice north of the mid-Atlantic. Ripe when the curly tendril nearest the fruit is brown and dry and the ground spot is buttery yellow.
Figures come from our crop data; dates use Alabama’s average frost dates. More in the full watermelon growing guide.
Watermelon planting dates by USDA zone in Alabama
Alabama spans USDA zones 7b, 8a, 8b, 9a. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the watermelon dates shift with them.
When to plant watermelons in nearby states
| State | Last frost | Plant out |
|---|---|---|
| Alabama (this page) | March 25 | Apr 1 – Apr 18 |
| Mississippi | March 20 | Mar 27 – Apr 13 |
| Louisiana | March 5 | Mar 12 – Mar 29 |
| Florida | February 12 | Feb 19 – Mar 8 |
| Arkansas | April 3 | Apr 10 – Apr 27 |
Questions gardeners in Alabama ask
When is the best time to plant watermelons in Alabama?
Plant watermelon transplants outdoors in Alabama between April 1 and April 18. That timing is set by Alabama's average last spring frost of March 25.
When should I start watermelon seeds indoors in Alabama?
Start seeds indoors between February 25 and March 11, about 3 weeks before the last frost, so the seedlings are ready to plant out from April 1.
What is the latest I can plant watermelons in Alabama?
About August 27. Watermelons need at least 70 days to mature, and frost around November 5 ends the season, so later plantings risk being cut short.
When will watermelons planted in Alabama be ready to harvest?
Planted on time, watermelons are usually ready from about June 17 to July 17, 70-100 days after planting.
When is the last frost in Alabama?
On average around March 25, with the first fall frost around November 5 - about 225 frost-free days. Your town may differ by two weeks or more.