Quick planting window
| Start indoors | Not recommended; sow seeds directly instead |
|---|---|
| Transplant | Not recommended; sow seeds directly to avoid root disturbance |
| Sow seeds | April to May |
| Estimated harvest | May |
| Risk | Low risk |
Month calendar
Scan the year by month to see seed starting, sowing, transplanting, and harvest timing.
Radish is a reasonable spring choice for Washington if you adjust for your local microclimate.
Next: ZIP code personalization
This is a state-level planning window based on typical frost timing and crop rules. Use local Extension guidance or a ZIP code frost-date tool before planting.
Planning notes
Days to maturity
28
Covered states
Washington
Frost window
April to May / October to November
Adjust for the Cascades: east and west of the mountains often need different timing.
Radish growing notes
The calendar window is only the first step. These growing details affect survival, plant vigor, and harvest quality.
Sun
Full sun in cool weather.
Soil
Loose soil without crusting.
Spacing
1-2 inches after thinning.
Container
Excellent in shallow containers.
Watering
Keep evenly moist for mild flavor.
Common mistake
Leaving roots in the ground too long.
Beginner tip
Sow small batches weekly during cool windows.
Month window table
| Crop | Spring transplant / sow | Spring harvest | Fall transplant / sow | Fall harvest |
|---|---|---|---|---|
| Radish | April to May | May | September to October | October |
Sources and limits
This page uses Washington state-level frost windows, USDA zone ranges, and crop rules for planning. It does not replace local Extension or county-level guidance.
FAQ
When should I start radish seeds indoors in Washington?
Radish is usually not started indoors. Sow outdoors in the recommended window instead.
When should I transplant radish in Washington?
Radish is usually better sown outdoors because transplanting can disturb the roots.
Can I sow radish outdoors in Washington?
Yes. The spring outdoor sowing window is about April to May, assuming soil and night temperatures are suitable.
When can I harvest radish in Washington?
Spring planting estimates a harvest around May; fall planting estimates about October. Variety and weather can shift this by several weeks.
Is radish risky in Washington?
Radish is a reasonable spring choice for Washington if you adjust for your local microclimate. For fall: Radish is a reasonable fall choice for Washington if you adjust for your local microclimate.
Do local differences inside Washington matter?
Adjust for the Cascades: east and west of the mountains often need different timing. Treat this as a state-level starter window and confirm with a local Extension or frost-date tool before planting.
What growing details matter most for radish?
Full sun in cool weather. Loose soil without crusting. Common mistake: Leaving roots in the ground too long.
Is this ZIP-code accurate?
No. This page uses state-level windows; ZIP-code frost dates, USDA zone matching, and reminder calendars are planned for the next phase.