Warm-Season Vegetable

When to Plant Squash (Summer) in South Carolina

Zucchini and yellow squash are the garden's most generous producers. You'll be sharing with neighbors by midsummer.

The Short Answer

In South Carolina, squash (summer) planting dates vary by region. In Upstate, your average last frost is around Mar 25 - Apr 10, while Coastal sees its last frost around Feb 25 - Mar 15. Since squash (summer) are frost-sensitive, start seeds indoors 3 weeks before your last frost, then transplant outside 2 weeks after frost danger has passed. Red clay in Piedmont. Sandy soils on coast. Acidic throughout. Rich alluvial soils in river valleys.

South Carolina Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Upstate 7a, 7b Mar 25 - Apr 10 Oct 20 - Nov 5
Midlands 7b, 8a Mar 15 - Apr 1 Nov 1 - Nov 15
Coastal 8a, 8b, 9a Feb 25 - Mar 15 Nov 10 - Dec 1

Squash (Summer) Planting Schedule for South Carolina

Upstate (Zones 7a, 7b)

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

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

Midlands (Zones 7b, 8a)

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

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

Coastal (Zones 8a, 8b, 9a)

Average last frost: Feb 25 - Mar 15 · Average first frost: Nov 10 - Dec 1

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

Growing Squash (Summer) in South Carolina

Squash (Summer) in South Carolina's Climate

Your long season supports both summer and winter squash without the season-length anxiety that northern growers face. Spring and fall plantings are both productive. Squash vine borer typically has two generations in warm climates — stagger plantings to ensure some production survives.

Soil Considerations for South Carolina

Red clay in Piedmont. Sandy soils on coast. Acidic throughout. Rich alluvial soils in river valleys. Make sure soil has warmed to at least 60°F before planting squash (summer) outside.

South Carolina Climate & Growing Season

Long, hot growing season. Subtropical on coast. Two main planting seasons. Summer heat can stress cool-season crops. Squash (Summer) 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 South Carolina: Upstate (7a, 7b) has a last frost around Mar 25 - Apr 10, while Coastal (8a, 8b, 9a) sees frost end around Feb 25 - Mar 15. This difference matters for squash (summer) — transplant timing shifts by several weeks across the state.

Growing Tips

Harvest when fruits are 6-8 inches long for best flavor. Larger squash become seedy and tough.

Companion Planting

Plant squash (summer) alongside these companions for better growth:

Corn Beans Nasturtiums

Keep squash (summer) away from:

Potatoes

The Bottom Line

Squash (Summer) can be grown successfully across South Carolina, but your exact planting dates depend on which region you're in. Upstate gardeners should plan around a Mar 25 - Apr 10 last frost, while those in Coastal can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Squash (Summer) Growing Guide National planting guide with all states South Carolina Planting Calendar All plants for South Carolina Squash (Summer) in Alabama Alabama planting dates Squash (Summer) in Alaska Alaska planting dates Squash (Summer) in Arizona Arizona planting dates Squash (Summer) 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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