PlantingWindowThe American Planting Almanac

When to plant radishes in Nashville, Tennessee

March 2 – March 16

Direct-sow outdoors · typical Nashville year

Climate basis: NOAA station Shelby Bottoms Nature, TN (USC00408238), 4 mi (6 km) from downtown Nashville (ZCTA 37203 centroid), elevation 405 ft, on the 1991–2020 climate normals. Direct-sow radishes from approximately the dates above, anchored to the median last spring 32°F freeze (April 1). One year in ten still freezes after April 16.

Last spring freezeApril 11-in-10 after Apr 16
First fall freezeOctober 311-in-10 before Oct 18
Frost-free season≈ 213 daysmedian at 32°F
Hard freeze, 28°Mar 20 – Nov 9kills even hardy greens
USDA zone7b5 to 10°F winter low — not frost timing

The Nashville year

Direct-sow outdoorsMar 2 – Mar 16
Fall plantingSep 5 – Oct 3
  • indoors under lights
  • in the garden
  • frost-free season
  • 1-in-10 years still freeze to Apr 16
Radishes in Nashville · freeze context from Shelby Bottoms Nature, TN, 1991–2020 normals.

Every method, with its sources

Direct-sow outdoors

Mar 2 – Mar 16

Purdue: hardy — 4–6 weeks before the last frost; Penn State's earliest sowing Apr 1 (−30 days) is the later start and is used. Anchored to the median last spring freeze (Apr 1). Penn State Extension (York County Master Gardeners) · Purdue University Extension

Fall planting

Sep 5 – Oct 3

Purdue Table 2: plant fall radishes at least 4–8 weeks before the first fall frost. Anchored to the median first fall freeze (Oct 31). Purdue University Extension

Variety assumption: Assumes a spring type (about 25–35 days; Penn State lists 30).

These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.

This week, not a typical year:
Crop rule sources (2)

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