When to Plant Sweet Corn in Wisconsin

Growing Sweet Corn in Wisconsin: Complete Guide

Sweet Corn (Zea mays var. saccharata) is a crop that grows best when sown directly in the garden. Depending on your zone, the right time to direct sow in Wisconsin falls between April 6, 2027 (Zone 6a) and May 6, 2027 (Zone 3b), once soil temperatures are consistently warm enough for germination.

Because Wisconsin stretches across 6 USDA hardiness zones (3b, 4a, 4b, 5a, 5b, 6a), planting windows can shift by as much as six to eight weeks from one end of the state to the other. Gardeners in the warmer southern zones can start earlier, while those in cooler northern zones should wait until the zone table above shows their last frost has passed.

With 75 days to maturity, Sweet Corn fits comfortably within Wisconsin's growing season in most zones. In the warmest parts of the state, a second planting later in the season may be possible.

Sweet Corn requires full sun (8+ hours) and high (consistent moisture, especially at silking) moisture. Midwest growing seasons are compressed between late spring frosts and fall cold snaps, so timing transplants precisely pays off.

For the most precise planting dates tailored to your exact location, enter your ZIP code on our planting calendar or use the zone table above to find the schedule for your area of Wisconsin.