Warm-Season Vegetable

When to Plant Corn (Sweet) in Maryland

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

The Short Answer

In Maryland, corn (sweet) planting dates vary by region. In Western Maryland, your average last frost is around May 1 - May 15, while Eastern Shore sees its last frost around Apr 1 - Apr 15. Since corn (sweet) are frost-sensitive, direct sow 2 weeks after your last frost date. Clay soils in Piedmont. Sandy loam on Eastern Shore. Acidic in most areas. Rich alluvial soils along river valleys.

Maryland Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Western Maryland 5b, 6a May 1 - May 15 Sep 25 - Oct 10
Central Maryland 6b, 7a Apr 10 - Apr 25 Oct 10 - Oct 25
Eastern Shore 7a, 7b, 8a Apr 1 - Apr 15 Oct 20 - Nov 5

Corn (Sweet) Planting Schedule for Maryland

Western Maryland (Zones 5b, 6a)

Average last frost: May 1 - May 15 · Average first frost: Sep 25 - Oct 10

Direct Sow
2 wks after frost

Central Maryland (Zones 6b, 7a)

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

Direct Sow
2 wks after frost

Eastern Shore (Zones 7a, 7b, 8a)

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

Direct Sow
2 wks after frost

Growing Corn (Sweet) in Maryland

Corn (Sweet) in Maryland's Climate

Your climate is classic corn country. Direct sow from mid-May. Succession plant through late June for harvests from July through September. Moderate summer temperatures produce long-lasting ears without the heat stress that shortens quality in southern states. European corn borer and corn earworm are the primary pests.

Soil Considerations for Maryland

Clay soils in Piedmont. Sandy loam on Eastern Shore. Acidic in most areas. Rich alluvial soils along river valleys. Make sure soil has warmed to at least 60°F before planting corn (sweet) outside.

Maryland Climate & Growing Season

Moderate climate with four seasons. Hot, humid summers. Good growing season. Diverse growing conditions across the state. 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 Maryland: Western Maryland (5b, 6a) has a last frost around May 1 - May 15, while Eastern Shore (7a, 7b, 8a) sees frost end around Apr 1 - Apr 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 Maryland, but your exact planting dates depend on which region you're in. Western Maryland gardeners should plan around a May 1 - May 15 last frost, while those in Eastern Shore 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 Maryland Planting Calendar All plants for Maryland 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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