Annual Flower

When to Plant Sunflowers in Ohio

Few things bring more joy than a row of sunflowers turning their faces to the sun. Easy, dramatic, and pollinator-friendly.

The Short Answer

Sunflowers are one of Ohio's most rewarding summer crops — easy to grow, dramatic to look at, and loved by bees and birds. The state's warm summers and adequate rainfall create ideal conditions for towering stalks topped with golden flowers.

Ohio Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Ohio 5b, 6a May 1 - May 15 Oct 1 - Oct 15
Central Ohio 6a, 6b Apr 20 - May 5 Oct 10 - Oct 25
Southern Ohio 6b Apr 15 - Apr 30 Oct 15 - Oct 30

Sunflowers Planting Schedule for Ohio

Northern Ohio (Zones 5b, 6a)

Average last frost: May 1 - May 15 · Average first frost: Oct 1 - Oct 15

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

Central Ohio (Zones 6a, 6b)

Average last frost: Apr 20 - May 5 · Average first frost: Oct 10 - Oct 25

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

Southern Ohio (Zones 6b)

Average last frost: Apr 15 - Apr 30 · Average first frost: Oct 15 - Oct 30

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

Growing Sunflowers in Ohio

State-Specific Growing Tips

Direct sow 1 week after last frost (mid-May in most of Ohio). Succession plant every 2 weeks through late June for blooms all summer. Plant in full sun (the more, the better). Space 12 inches apart for multi-stem cutting varieties, wider for giant single-stem types. Ohio's clay soil grows sunflowers well — they're remarkably soil-tolerant. Stake tall varieties before Ohio's summer thunderstorms.

Recommended Varieties for Ohio

Mammoth Grey Stripe for giant single heads (bird seed). ProCut series for cut flowers. Sunrich for uniform blooms. Moulin Rouge for dramatic dark red. Ohio State Extension recommends sunflowers as one of the easiest flowers for Ohio beginners.

Common Challenges in Ohio

Squirrels and birds eat developing seeds — cover heads with cheesecloth if you want to harvest seeds. Deer browse young plants. Powdery mildew in humid conditions. Sunflower moth larvae eat developing seeds.

Growing Tips

Direct sow is preferred — sunflowers don't love transplanting. Succession plant every 2 weeks for blooms all summer.

Companion Planting

Plant sunflowers alongside these companions for better growth:

Cucumbers Squash Corn

Keep sunflowers away from:

Potatoes

The Bottom Line

Sunflowers can be grown successfully in Ohio with proper attention to regional frost dates and local growing conditions. Timing varies across the state — Northern Ohio gardeners work with a last frost around May 1 - May 15, while Southern Ohio sees frost end around Apr 15 - Apr 30. Choose varieties suited to your region, amend your soil based on its specific needs, and monitor for the pests and diseases most common in your area. For exact dates based on your zip code, use our free planting date finder.

Related Guides

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