Best Corn to Grow in South Dakota
South Dakota spans USDA Zones 3–5, typically Zone 4. We've broken out 32 corn varieties by zone — pick your zone below or find the right varieties for your specific part of the state.
Varieties
32
for South Dakota
USDA
Zones 3–5
120–155 days season
Beginner
16
easy to grow
Heirloom
12
heritage varieties
South Dakota in USDA Zones 3–5
South Dakota spans Zones 3–5. Variety lists below are organized by zone — start with your zone for the most accurate recommendations.
Growing Corn in South Dakota
Zone 4 presents unique opportunities and challenges for corn growing that smart variety selection can overcome. With your average last frost around May 10th and first frost by September 25th, you're working with approximately 135 frost-free days – a respectable window that allows for both early and mid-season varieties, though late-season types will push your limits. The key advantage in Zone 4 is the long, bright summer days that corn absolutely loves, plus the natural cooling that prevents many pest issues common in warmer zones.
When selecting corn for Zone 4, prioritize varieties with maturity dates of 75-90 days to ensure harvest before frost threatens. Look for cold-tolerant varieties that can handle your cooler soil temperatures at planting time, and consider the newer sugar-enhanced (SE) and supersweet varieties that have been bred for better cold tolerance than older open-pollinated types. The varieties listed here have all proven themselves in northern gardens, offering everything from classic sweet corn flavor to stunning ornamental qualities, with reliable performance in your shorter growing season.
Zone 4 Corn for South Dakota★ Most of SD
32 varieties · Last frost May 10 · 135-day season
Zone 3 Corn for South Dakota
32 varieties · Last frost May 15 · 120-day season
Zone 5 Corn for South Dakota
32 varieties · Last frost April 30 · 155-day season
Zone 4 Growing Tips for South Dakota
Direct seed your corn after soil temperatures reach 60°F consistently, typically 1-2 weeks after your average last frost date – so aim for late May in most Zone 4 areas. Cold soil will cause seeds to rot rather than germinate, so patience pays off here. Plant seeds 1-1.5 inches deep in blocks rather than rows for better pollination, spacing plants 8-12 inches apart. For earlier harvests, start seeds indoors in biodegradable pots 2-3 weeks before transplant date, but handle carefully since corn doesn't love root disturbance.
Your shorter season means maximizing every warm day counts. Use black plastic mulch or row covers to warm soil faster in spring, and choose the sunniest, most protected spot in your garden. Plant successive crops every 2 weeks through mid-June to extend your harvest window. If early frost threatens in September, harvest ears when kernels are still slightly immature – they'll often continue ripening off the stalk for a few days indoors.