When to plant radishes
Direct-sow radishes 3 weeks before your last spring frost.. Enter your ZIP below for exact dates.
The rule
Direct-sow 2–4 weeks before the last frost. [src]Cited: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”
Days to maturity: 25–30 days [src]
Method: Direct-sow in the garden. Frost tolerance: frost-hardy (derived from the planting timing above).
Because radishes is frost-hardy and matures in about 25–30 days, it's a strong fall crop — sow it in mid-to-late summer so it finishes before your first frost.
Radishes planting dates by hardiness zone
| Zone | Start indoors | Direct-sow | Sow for fall |
|---|---|---|---|
| Zone 10a | — | December 18 – January 1 | October 12 – October 26 |
| Zone 10b | — | December 23 – January 6 | December 5 – December 19 |
| Zone 2a | — | April 19 – May 3 | July 18 – August 1 |
| Zone 2b | — | April 27 – May 11 | July 26 – August 9 |
| Zone 3b | — | April 22 – May 6 | July 30 – August 13 |
| Zone 4a | — | April 16 – April 30 | August 7 – August 21 |
| Zone 4b | — | April 12 – April 26 | August 10 – August 24 |
| Zone 5a | — | April 14 – April 28 | August 11 – August 25 |
| Zone 5b | — | April 6 – April 20 | August 18 – September 1 |
| Zone 6a | — | April 2 – April 16 | August 25 – September 8 |
| Zone 6b | — | March 26 – April 9 | August 30 – September 13 |
| Zone 7a | — | March 18 – April 1 | September 5 – September 19 |
| Zone 7b | — | March 9 – March 23 | September 11 – September 25 |
| Zone 8a | — | February 26 – March 12 | September 18 – October 2 |
| Zone 8b | — | February 16 – March 2 | September 25 – October 9 |
| Zone 9a | — | February 2 – February 16 | October 5 – October 19 |
| Zone 9b | — | January 5 – January 19 | October 18 – November 1 |
What you'll need
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Last verified 2026-07-16. Sources: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”; University of Georgia Extension (days to maturity); NOAA NCEI 1991–2020 Climate Normals (frost); USDA 2023 Plant Hardiness Zone Map.