Warm-Season Vegetable

When to Plant Corn (Sweet) in South Carolina

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

The Short Answer

In South Carolina, corn (sweet) 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 corn (sweet) are frost-sensitive, direct sow 2 weeks after your last frost date. 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

Corn (Sweet) Planting Schedule for South Carolina

Upstate (Zones 7a, 7b)

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

Direct Sow
2 wks after frost

Midlands (Zones 7b, 8a)

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

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

Direct Sow
2 wks after frost

Growing Corn (Sweet) in South Carolina

Corn (Sweet) in South Carolina'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 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 corn (sweet) outside.

South Carolina Climate & Growing Season

Long, hot growing season. Subtropical on coast. Two main planting seasons. Summer heat can stress cool-season crops. 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 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 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 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

Corn (Sweet) Growing Guide National planting guide with all states South Carolina Planting Calendar All plants for South Carolina 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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