Root Vegetable

When to Plant Radishes in Connecticut

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

The Short Answer

In Connecticut, soil conditions are an important factor for radishes. Rocky New England soil common. Acidic in many areas. Raised beds popular for dealing with rocky ground. Direct sow 4 weeks before your last frost date. Radishes can also be planted in fall, 6 weeks before your first frost.

Connecticut Frost Dates

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

Region	Zones	Last Frost (Spring)	First Frost (Fall)
Northern Connecticut	5b, 6a	May 1 - May 15	Sep 25 - Oct 10
Coastal Connecticut	6b, 7a	Apr 15 - May 1	Oct 10 - Oct 25

Radishes Planting Schedule for Connecticut

Northern Connecticut (Zones 5b, 6a)

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

Direct Sow

4 wks before frost

Fall Planting

6 wks before first frost

Coastal Connecticut (Zones 6b, 7a)

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

Growing Radishes in Connecticut

Radishes in Connecticut'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 Connecticut

Rocky New England soil common. Acidic in many areas. Raised beds popular for dealing with rocky ground. Loose, well-drained soil is especially important for radishes since the edible portion grows underground. If your soil is heavy clay, consider raised beds.

Connecticut Climate & Growing Season

Four distinct seasons. Maritime influence moderates coastal temperatures. Shorter growing season inland. Radishes can handle frost well, which is an advantage in Connecticut's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across Connecticut: Northern Connecticut (5b, 6a) has a last frost around May 1 - May 15, while Coastal Connecticut (6b, 7a) sees frost end around Apr 15 - May 1. 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 Connecticut, but your exact planting dates depend on which region you're in. Northern Connecticut gardeners should plan around a May 1 - May 15 last frost, while those in Coastal Connecticut can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

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