Warm-Season Vegetable

When to Plant Tomatoes in Oklahoma

America's favorite garden vegetable (technically a fruit). Nothing beats a sun-warmed tomato straight off the vine.

The Short Answer

In Oklahoma, tomatoes 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 tomatoes are frost-sensitive, start seeds indoors 6 weeks before your last frost, then transplant outside 2 weeks after frost danger has passed. 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

Tomatoes Planting Schedule for Oklahoma

Northern Oklahoma (Zones 6b, 7a)

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

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks after frost
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

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks after frost
Direct Sow
2 wks after frost

Southern Oklahoma (Zones 7b)

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

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks after frost
Direct Sow
2 wks after frost

Growing Tomatoes in Oklahoma

Tomatoes in Oklahoma's Climate

Your long growing season gives tomatoes plenty of time, but extreme summer heat above 95°F can cause blossom drop and pause fruit set during the hottest weeks. In the Deep South and Texas, many growers aim for two tomato seasons — spring (transplant early) and fall (start new plants in July). Choose heat-tolerant varieties like Heat Wave, Solar Fire, and Phoenix. Afternoon shade from taller plants can help during the most brutal July-August heat.

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 tomatoes outside.

Oklahoma Climate & Growing Season

Hot summers. Severe thunderstorms and tornado risk. Good growing season length. Windy — windbreaks help gardens. Tomatoes 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 tomatoes — transplant timing shifts by several weeks across the state.

Growing Tips

Pinch off suckers for indeterminate varieties. Stake or cage for best results. Water at the base, not overhead, to prevent blight.

Companion Planting

Plant tomatoes alongside these companions for better growth:

Basil Carrots Peppers Marigolds

Keep tomatoes away from:

Brassicas Fennel Dill

The Bottom Line

Tomatoes 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

Tomatoes Growing Guide National planting guide with all states Oklahoma Planting Calendar All plants for Oklahoma Tomatoes in Alabama Alabama planting dates Tomatoes in Alaska Alaska planting dates Tomatoes in Arizona Arizona planting dates Tomatoes 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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