When to plant radishes
Short answer
Plant radishes about 4 weeks before your last spring frost. In a mid climate (zone 5) that's around Mar 18. Enter your ZIP for your exact dates.
| Climate zone | Start indoors | Plant outside | Harvest |
|---|---|---|---|
| Zone 1 | — | Jan 1 | Jan 15 |
| Zone 2 | — | Jan 18 | Feb 15 |
| Zone 3 | — | Feb 10 | Mar 10 |
| Zone 4 | — | Mar 2 | Mar 30 |
| Zone 5 | — | Mar 18 | Apr 15 |
| Zone 6 | — | Apr 2 | Apr 30 |
| Zone 7 | — | Apr 17 | May 15 |
| Zone 8 | — | May 4 | Jun 1 |
Higher climate-zone numbers are colder, so planting shifts later. Radishes is a hardy crop. Enter your ZIP in the calculator for your exact zone and dates.
Your exact dates
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Frequently asked questions
When should I plant radishes?
Sow radishes directly about 4 weeks before your last spring frost — it tolerates cold. In a warmer zone 4 that's around Mar 2; in a colder zone 6, Apr 2.
Can I direct sow radishes?
Yes — radishes is usually sown directly in the garden rather than started indoors.
How long until radishes is ready to harvest?
About 28 days from transplant or sowing. In zone 6, plants set out around Apr 2 are typically ready near Apr 30.