Root Vegetable

When to Plant Radishes in Indiana

The fastest vegetable in the garden — some varieties are ready in just 25 days. Perfect for impatient gardeners and kids.

The Short Answer

In Indiana, soil conditions are an important factor for radishes. Clay-heavy soils common statewide. Rich but can have drainage issues. Raised beds help with heavy clay. Direct sow 4 weeks before your last frost date. Radishes can also be planted in fall, 6 weeks before your first frost.

Indiana Frost Dates

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

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

Radishes Planting Schedule for Indiana

Northern Indiana (Zones 5b, 6a)

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

Direct Sow
4 wks before frost
Fall Planting
6 wks before first frost

Central Indiana (Zones 6a, 6b)

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

Direct Sow
4 wks before frost
Fall Planting
6 wks before first frost

Southern Indiana (Zones 6b)

Average last frost: Apr 10 - Apr 25 · Average first frost: Oct 15 - Nov 1

Direct Sow
4 wks before frost
Fall Planting
6 wks before first frost

Growing Radishes in Indiana

Radishes in Indiana's Climate

Radishes are the instant-gratification crop of spring. Direct sow 4 weeks before last frost and succession plant every 2 weeks through May. They bolt and turn pithy once temperatures exceed 80°F consistently. Resume sowing in September for fall harvest. Great for kids and first-time gardeners.

Soil Considerations for Indiana

Clay-heavy soils common statewide. Rich but can have drainage issues. Raised beds help with heavy clay. Loose, well-drained soil is especially important for radishes since the edible portion grows underground. If your soil is heavy clay, consider raised beds.

Indiana Climate & Growing Season

Four seasons. Hot, humid summers. Adequate rainfall for most crops. Occasional late spring frosts catch gardeners off guard. Radishes can handle frost well, which is an advantage in Indiana's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across Indiana: Northern Indiana (5b, 6a) has a last frost around Apr 25 - May 10, while Southern Indiana (6b) sees frost end around Apr 10 - Apr 25. This difference matters for radishes — but radishes handle frost well, so the timing difference is less critical.

Growing Tips

Don't let them stay in the ground too long — they get pithy and hot. Succession plant every 2 weeks for continuous harvest.

Companion Planting

Plant radishes alongside these companions for better growth:

Peas Lettuce Carrots Spinach

The Bottom Line

Radishes can be grown successfully across Indiana, but your exact planting dates depend on which region you're in. Northern Indiana gardeners should plan around a Apr 25 - May 10 last frost, while those in Southern Indiana can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

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