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 | July to August |
| Risk | Low risk |
Month calendar
Scan the year by month to see seed starting, sowing, transplanting, and harvest timing.
Potato 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
100
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.
Potato growing notes
The calendar window is only the first step. These growing details affect survival, plant vigor, and harvest quality.
Sun
Full sun.
Soil
Loose, slightly acidic, well-drained soil.
Spacing
10-12 inches between seed pieces.
Container
Works well in grow bags or deep containers.
Watering
Keep evenly moist after plants emerge.
Common mistake
Letting tubers get exposed to light.
Beginner tip
Hill soil or mulch as plants reach 6-8 inches tall.
Month window table
| Crop | Spring transplant / sow | Spring harvest | Fall transplant / sow | Fall harvest |
|---|---|---|---|---|
| Potato | April to May | July to August | July to August | October to November |
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 potato seeds indoors in Washington?
Potato is usually not started indoors. Sow outdoors in the recommended window instead.
When should I transplant potato in Washington?
Potato is usually better sown outdoors because transplanting can disturb the roots.
Can I sow potato 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 potato in Washington?
Spring planting estimates a harvest around July to August; fall planting estimates about October to November. Variety and weather can shift this by several weeks.
Is potato risky in Washington?
Potato is a reasonable spring choice for Washington if you adjust for your local microclimate. For fall: Potato 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 potato?
Full sun. Loose, slightly acidic, well-drained soil. Common mistake: Letting tubers get exposed to light.
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.