Quick planting window
| Start indoors | March to April |
|---|---|
| Transplant | May to June |
| Sow seeds | Usually not recommended for this crop in a short-season garden |
| Estimated harvest | July to August |
| Risk | Medium risk |
Month calendar
Scan the year by month to see seed starting, sowing, transplanting, and harvest timing.
Tomato is frost sensitive. Wait until the conservative transplant or sowing window for Washington.
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
75
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.
Tomato growing notes
The calendar window is only the first step. These growing details affect survival, plant vigor, and harvest quality.
Sun
Full sun, ideally 6-8+ hours.
Soil
Rich, well-drained soil with compost.
Spacing
18-24 inches for compact types; 24-36 inches for vigorous vines.
Container
Use a 5+ gallon container for patio types; larger is better.
Watering
Water deeply and consistently; avoid wetting leaves late in the day.
Common mistake
Transplanting before nights are warm enough.
Beginner tip
Harden seedlings off for 7-10 days before planting outside.
Month window table
| Crop | Spring transplant / sow | Spring harvest | Fall transplant / sow | Fall harvest |
|---|---|---|---|---|
| Tomato | May to June | July to August | July to August | September to 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 tomato seeds indoors in Washington?
For spring, the indoor seed-starting window is about March to April. Move later if your local frost date is later than the state average.
When should I transplant tomato in Washington?
For spring, the transplant window is about May to June. Harden seedlings off before planting outside.
Can I sow tomato outdoors in Washington?
Outdoor sowing is usually riskier for tomato in short-season gardens.
When can I harvest tomato in Washington?
Spring planting estimates a harvest around July to August; fall planting estimates about September to October. Variety and weather can shift this by several weeks.
Is tomato risky in Washington?
Tomato is frost sensitive. Wait until the conservative transplant or sowing window for Washington. For fall: Tomato is frost sensitive. Fall planting in Washington needs enough warm days before first frost.
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 tomato?
Full sun, ideally 6-8+ hours. Rich, well-drained soil with compost. Common mistake: Transplanting before nights are warm enough.
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.