When to plant sweet corn in Oklahoma
Oklahoma’s average last spring frost is April 1, and the first fall frost typically arrives around November 1 — about 214 frost-free days (USDA zones 6b, 7a, 7b, 8a). Sweet Corn needs 60–100 days to mature, which fits comfortably within Oklahoma's growing season.
When to plant sweet corn in Oklahoma: the short answer
For a spring planting, sow Apr 3 – Apr 22. Wait until the soil is at least 55°F and frost is over.
Succession sow again in Oklahoma: Apr 22 · May 6 · May 20 · Jun 3 · Jun 17 · Jul 1 · Jul 15 · Jul 29
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 sweet corn in Oklahoma, step by step
- Prepare the bed. It needs at least six to eight hours of direct sun a day and loose soil at least 24 inches deep, with a pH between 5.8 and 7.0. Dig in compost before planting.
- Sow outdoors (Apr 3 – Apr 22). Space plants about 10 inches apart in rows 30 inches apart, sowing seed 1.5 inches deep. It is killed by frost, so nothing goes outside until the danger has passed.
- Water and feed. It needs plenty of water; keep the soil evenly moist and never let it dry out.
- Watch for pests and problems. Pests: corn earworm, European corn borer, corn rootworm, raccoons. Diseases and disorders: common smut, common rust, Stewart's wilt.
- Harvest (from about Jun 7 – Jul 17). Sweet Corn takes 60-100 days to reach harvest. Plant in a block of at least 4 short rows, not one long row, or the ears fill unevenly. Keep sugar-enhanced and supersweet types isolated from field corn. Succeed by sowing every 2 weeks or planting early/mid/late varieties together.
Figures come from our crop data; dates use Oklahoma’s average frost dates. More in the full sweet corn growing guide.
Sweet Corn planting dates by USDA zone in Oklahoma
Oklahoma spans USDA zones 6b, 7a, 7b, 8a. 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 sweet corn dates shift with them.
When to plant sweet corn in nearby states
| State | Last frost | Sow |
|---|---|---|
| Oklahoma (this page) | April 1 | Apr 3 – Apr 22 |
| North Dakota | May 15 | May 17 – Jun 5 |
| South Dakota | May 10 | May 12 – May 31 |
| Nebraska | April 30 | May 2 – May 21 |
| Kansas | April 15 | Apr 17 – May 6 |
Questions gardeners in Oklahoma ask
When is the best time to plant sweet corn in Oklahoma?
Sow sweet corn in Oklahoma between April 3 and April 22. That timing is set by Oklahoma's average last spring frost of April 1.
What is the latest I can plant sweet corn in Oklahoma?
About September 2. Sweet corn needs at least 60 days to mature, and frost around November 1 ends the season, so later plantings risk being cut short.
When will sweet corn planted in Oklahoma be ready to harvest?
Planted on time, sweet corn is usually ready from about June 7 to July 17, 60-100 days after sowing.
When is the last frost in Oklahoma?
On average around April 1, with the first fall frost around November 1 - about 214 frost-free days. Your town may differ by two weeks or more.