🔴 When to Plant Radishes
Fast crop — harvest in 25-30 days
📅 Planting Calendar by USDA Zone
Radishes is a cool-season crop — plant it around your last spring frost, and you can often start it earlier indoors or sow again for a fall harvest. Find the exact start-indoors, transplant, and direct-sow dates for your USDA zone in the table below.
Select your zone to highlight your dates. All dates are calculated from each zone's average frost dates — see how we calculate them.
| Zone | Last Frost | Start Indoors | Transplant | Direct Sow |
|---|---|---|---|---|
| Zone 2A | May 30 | — | — | Apr 18 |
| Zone 3B | May 15 | — | — | Apr 3 |
| Zone 4A | May 8 | — | — | Mar 27 |
| Zone 4B | May 1 | — | — | Mar 20 |
| Zone 5A | Apr 25 | — | — | Mar 14 |
| Zone 5B | Apr 18 | — | — | Mar 7 |
| Zone 6A | Apr 21 | — | — | Mar 10 |
| Zone 6B | Apr 10 | — | — | Feb 27 |
| Zone 7A | Apr 5 | — | — | Feb 22 |
| Zone 7B | Mar 28 | — | — | Feb 14 |
| Zone 8A | Mar 20 | — | — | Feb 6 |
| Zone 8B | Mar 12 | — | — | Jan 29 |
| Zone 9A | Feb 28 | — | — | Jan 17 |
| Zone 9B | Feb 15 | — | — | Jan 4 |
| Zone 10A | Feb 1 | — | — | Dec 21 |
| Zone 10B | Jan 15 | — | — | Dec 4 |
| Zone 11A | Jan 1 | — | — | Nov 20 |
Radishes are the fastest crop in the garden — some varieties are ready in under 30 days.
Top Growing Tips
- Perfect first crop for kids and beginners
- Sow directly — don’t transplant root crops
- Harvest promptly or they become woody and hot
- Great row marker — plant with slow-germinating carrots
- Fall radishes (daikon) are larger and store better
Companion Planting
Good companions: lettuce, peas, beans, cucumbers
Avoid planting near: hyssop
Harvest Timeline
22-30 days (spring varieties), 50-60 days (winter varieties)
Growing radishes in your region?
These dates come from your zone's frost windows. For the full month-by-month plan — succession sowing, variety picks, and timing tuned to your climate, not just your zone — our regional vegetable-gardening guides cover your area start to finish.
Find your regional growing guide