When should I plant radishes in ZIP 37203?

In ZIP 37203, the main radishes target is around Mar 13, based on the representative Nashville frost station and USDA zone 7b.

When should I start radishes seeds indoors in 37203?

Radishes is usually direct-sown for ZIP 37203. Use the Mar 13 planting window instead of starting it indoors.

Is this a guaranteed planting date?

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

ZIP 37203 planting calendar

When to plant radishes in Nashville, TN - Zone 7b

Q: When is the first frost in Nashville?

Nashville (ZIP 37203) has an average first fall frost around Oct 25, leaving about 198 frost-free days.

In ZIP 37203, plant radishes around Mar 13; this uses the Nashville frost station, USDA zone 7b, and radishes timing rules.

Your Nashville calendar has a 198-day estimated frost-free season. This estimate uses the representative Nashville frost station, USDA zone 7b, and radishes timing rules.

Source: nashville-intl frost station, USDA zone 7b, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

USDA zone 7b Nashville frost station University of Tennessee Extension Updated 2026-06-28

Read the method

Answer first

When to start radishes seeds indoors in Nashville

In ZIP 37203, radishes is usually direct-sown around Mar 13 instead of started indoors.

Radishes is normally direct-sown in Nashville. Use around Mar 13 as the outdoor planting window for ZIP 37203.

Seed starting schedule

Radishes dates for Nashville, TN

Step	Date	How to use it
Direct Sow	March 13, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Nashville?

Nashville (ZIP 37203) has an average last spring frost around Apr 10.

First frost

When is the first frost in Nashville?

The average first fall frost is around Oct 25, giving about 198 frost-free days.

Season map

Radishes windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Mar 13

Harvest

Apr 10

Frost watch

Sep 27

Reminder workflow

Every date has a next action

Direct sow radishesMar 13

Last frost windowApr 10

First radishes harvest windowApr 10

Last radishes sowing targetSep 27

Signal	Value	Why it matters
Last frost estimate	April 10, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	October 25, 2026	Fall planting counts backward from this date.
Season length	198 days	Longer seasons can support succession crops.
Spacing	1-2 in	Airflow and root space affect yield.
Soil temperature	40 F+	Seeds and transplants stall in cold soil.

GrowZone may earn from qualifying seed or supply links when real affiliate IDs are configured. No monetized links are active without disclosure.

Local data

Why this date changes by ZIP

Nashville frost history and USDA zone 7b shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

University of Tennessee Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Radishes timing notes

Fast crop; harvest promptly before roots get woody. Radishes prefers full sun, 1-2 in spacing, and soil near 40 F+.

For fall, count backward from Oct 25. A conservative last sowing target is around Sep 27.