When to plant sweet corn in Wisconsin
Wisconsin’s average last spring frost is May 10, and the first fall frost typically arrives around September 30 — about 143 frost-free days (USDA zones 3b, 4a, 4b, 5a, 5b). Sweet Corn needs 60–100 days to mature, which fits comfortably within Wisconsin's growing season.
When to plant sweet corn in Wisconsin: the short answer
For a spring planting, sow May 12 – May 31. Wait until the soil is at least 55°F and frost is over.
Succession sow again in Wisconsin: May 31 · Jun 14 · Jun 28 · Jul 12
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 Wisconsin, 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 (May 12 – May 31). 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 Jul 16 – Aug 25). 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 Wisconsin’s average frost dates. More in the full sweet corn growing guide.
Sweet Corn planting dates by USDA zone in Wisconsin
Wisconsin spans USDA zones 3b, 4a, 4b, 5a, 5b. 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
Questions gardeners in Wisconsin ask
When is the best time to plant sweet corn in Wisconsin?
Sow sweet corn in Wisconsin between May 12 and May 31. That timing is set by Wisconsin's average last spring frost of May 10.
What is the latest I can plant sweet corn in Wisconsin?
About August 1. Sweet corn needs at least 60 days to mature, and frost around September 30 ends the season, so later plantings risk being cut short.
When will sweet corn planted in Wisconsin be ready to harvest?
Planted on time, sweet corn is usually ready from about July 16 to August 25, 60-100 days after sowing.
When is the last frost in Wisconsin?
On average around May 10, with the first fall frost around September 30 - about 143 frost-free days. Your town may differ by two weeks or more.