Seattle Gardening Guide (2026)
Wet mild winters; cool-season lawn dominates.
USDA zone
8
Typical last frost
04/05
Typical first frost
11/05
Quick answer (Seattle): Gardeners here work in about a 214-day frost-free window around zone 8. State context: Washington (zones 4–9). Start warm crops indoors ~6 weeks before the last frost of 04/05.
Your Seattle planting calendar
Pre-filled with Seattle's frost dates. Choose a crop to print your plan.
In Washington (typical zone 4–9, last frost ≈ Apr 5, first frost ≈ Nov 5, 214-day season), your Tomato plan:
Start seeds indoors
Feb 22
Sow / transplant outdoors
Apr 19
First harvest
Jun 28
Spacing / depth
24″ / 0.25″
Month-by-month (Washington, 2026)
| Month | Action |
|---|---|
| Jan | — |
| Feb | Start indoors |
| Mar | — |
| Apr | Sow · Transplant |
| May | — |
| Jun | Harvest |
| Jul | — |
| Aug | — |
| Sep | — |
| Oct | — |
| Nov | — |
| Dec | — |
Start indoors 6 weeks before last frost; transplant after soil warms. Zones 3–13 suitable. Dates are typical; confirm with your county extension and watch the 10-day forecast.