Warm-Season Vegetable

When to Plant Corn (Sweet) in Oklahoma

Nothing says summer like fresh sweet corn. Plant in blocks (not rows) for proper pollination.

The Short Answer

In Oklahoma, corn (sweet) planting dates vary by region. In Northern Oklahoma, your average last frost is around Apr 5 - Apr 20, while Southern Oklahoma sees its last frost around Mar 15 - Apr 1. Since corn (sweet) are frost-sensitive, direct sow 2 weeks after your last frost date. Red clay soils common. Alkaline in west. Rich prairie soils in east. Wind erosion in western panhandle.

Oklahoma Frost Dates

Your planting dates depend on which part of Oklahoma you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Oklahoma 6b, 7a Apr 5 - Apr 20 Oct 15 - Nov 1
Central Oklahoma 7a, 7b Mar 25 - Apr 10 Oct 25 - Nov 10
Southern Oklahoma 7b Mar 15 - Apr 1 Nov 1 - Nov 15

Corn (Sweet) Planting Schedule for Oklahoma

Northern Oklahoma (Zones 6b, 7a)

Average last frost: Apr 5 - Apr 20 · Average first frost: Oct 15 - Nov 1

Direct Sow
2 wks after frost

Central Oklahoma (Zones 7a, 7b)

Average last frost: Mar 25 - Apr 10 · Average first frost: Oct 25 - Nov 10

Direct Sow
2 wks after frost

Southern Oklahoma (Zones 7b)

Average last frost: Mar 15 - Apr 1 · Average first frost: Nov 1 - Nov 15

Direct Sow
2 wks after frost

Growing Corn (Sweet) in Oklahoma

Corn (Sweet) in Oklahoma's Climate

Sweet corn hits the table earlier in warm climates — plant in March-April and harvest before northern states even think about planting. The goal is tasseling before consistent 95°F+ days, which can impair pollination. A second short-season crop in late July for fall harvest is possible in many warm zones.

Soil Considerations for Oklahoma

Red clay soils common. Alkaline in west. Rich prairie soils in east. Wind erosion in western panhandle. Make sure soil has warmed to at least 60°F before planting corn (sweet) outside.

Oklahoma Climate & Growing Season

Hot summers. Severe thunderstorms and tornado risk. Good growing season length. Windy — windbreaks help gardens. Corn (Sweet) cannot tolerate any frost, so wait until all frost danger has passed before transplanting outside. Watch local forecasts carefully in spring.

Growing season length varies across Oklahoma: Northern Oklahoma (6b, 7a) has a last frost around Apr 5 - Apr 20, while Southern Oklahoma (7b) sees frost end around Mar 15 - Apr 1. This difference matters for corn (sweet) — transplant timing shifts by several weeks across the state.

Growing Tips

Plant in blocks of at least 4x4 for wind pollination. Corn is a heavy feeder — amend soil with compost before planting.

Companion Planting

Plant corn (sweet) alongside these companions for better growth:

Beans Squash Melons

Keep corn (sweet) away from:

Tomatoes

The Bottom Line

Corn (Sweet) can be grown successfully across Oklahoma, but your exact planting dates depend on which region you're in. Northern Oklahoma gardeners should plan around a Apr 5 - Apr 20 last frost, while those in Southern Oklahoma can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Corn (Sweet) Growing Guide National planting guide with all states Oklahoma Planting Calendar All plants for Oklahoma Corn (Sweet) in Alabama Alabama planting dates Corn (Sweet) in Alaska Alaska planting dates Corn (Sweet) in Arizona Arizona planting dates Corn (Sweet) in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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