Root Vegetable

When to Plant Radishes in Kentucky

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

The Short Answer

In Kentucky, soil conditions are an important factor for radishes. Clay soils over limestone bedrock. Naturally alkaline. Good for many vegetables with amendment. Excellent for root crops in some areas. Direct sow 4 weeks before your last frost date. Radishes can also be planted in fall, 6 weeks before your first frost.

Kentucky Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Kentucky 6a, 6b Apr 15 - May 1 Oct 5 - Oct 20
Central Kentucky 6b Apr 10 - Apr 25 Oct 10 - Oct 25
Western Kentucky 6b, 7a Apr 5 - Apr 20 Oct 15 - Nov 1

Radishes Planting Schedule for Kentucky

Northern Kentucky (Zones 6a, 6b)

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

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

Central Kentucky (Zones 6b)

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

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

Western Kentucky (Zones 6b, 7a)

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

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

Growing Radishes in Kentucky

Radishes in Kentucky'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 Kentucky

Clay soils over limestone bedrock. Naturally alkaline. Good for many vegetables with amendment. Excellent for root crops in some areas. Loose, well-drained soil is especially important for radishes since the edible portion grows underground. If your soil is heavy clay, consider raised beds.

Kentucky Climate & Growing Season

Mild, four-season climate. Adequate rainfall. Hot, humid summers. Good growing season. Radishes can handle frost well, which is an advantage in Kentucky's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across Kentucky: Northern Kentucky (6a, 6b) has a last frost around Apr 15 - May 1, while Western Kentucky (6b, 7a) sees frost end around Apr 5 - Apr 20. 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 Kentucky, but your exact planting dates depend on which region you're in. Northern Kentucky gardeners should plan around a Apr 15 - May 1 last frost, while those in Western Kentucky 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 Kentucky Planting Calendar All plants for Kentucky 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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