Planting dates for Seattle
Frost dates and sow windows from the 30-year record at Seattle Boeing Fld, the official station 7 km from Seattle, Washington.
Sow and transplant events for the staples, straight from this page.
Key windows for Seattle (2026)
| Crop | Start indoors | Plant out / sow |
|---|---|---|
| Tomato | January 30 | March 20 |
| Pepper | January 16 | March 27 |
| Peas | – | February 6 |
| Lettuce | January 16 | February 13 |
| Carrot | – | February 20 |
| Bush beans | – | March 20 |
| Garlic | – | Fall planted |
| Potato | – | February 27 |
Mean-date planning windows, not guarantees; watch the local forecast at the shoulders. Method on the methodology page.
Seattle planting questions
When is the last frost in Seattle?
Around March 13, the 30-year mean date of the last spring frost at Seattle Boeing Fld, the official station 7 km from Seattle. Half of years see frost after the mean, so tender crops usually wait a week or more past it.
When can I plant tomatoes in Seattle?
Start seeds indoors around January 30 and transplant around March 20, once nights hold above 50F. The full 32-crop table on the planner computes every window for Seattle.
How long is the growing season in Seattle?
About 247 frost-free days on average, from roughly March 13 to November 17. Crops whose days-to-maturity exceed that window need transplants, short-season varieties, or season extension.
How this page was made
Every date above is computed from the NOAA NCEI U.S. Climate Normals at Seattle Boeing Fld: the 30-year mean dates of last spring and first fall frost, with crop offsets from standard horticultural practice. Full method and crop sources: data and methodology. These are planning averages, not forecasts: half of years frost later than the mean, so harden off transplants and watch the local forecast at the shoulders of the season.
More for Seattle: winter tire dates. Need every crop, or a different place? The full calendar covers 32 crops at 2697 stations.