Seattle Gardening Guide (2026)
Wet mild winters; cool-season lawn dominates.
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.
🌆 Seattle microclimate
- Cool, maritime (8a-8b)
- Mild wet winters, dry summers
- Excellent for cool-season crops
What to grow here, by environment
Your Seattle planting calendar
Pre-filled with Seattle's frost dates. Choose a crop to print your plan.
In this ZIP (typical zone 4–9), last frost ≈ Apr 5, first frost ≈ Nov 5 (214-day season), your Tomato plan:
Month-by-month (this ZIP, 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.
Common pests near Seattle
Pre-filled to Washington. Pick a pest for signs, organic-first treatment, and a printable IPM card.
Slugs & Snails
Crops that fit zone 8
Vegetables and herbs suited to your metro zone — open any for a state-specific planting card:
Seattle year at a glance
A month-by-month rhythm built from Seattle's typical frost window (last frost 04/05, first frost 11/05). Dates shift with weather — watch the 10-day forecast before planting tender crops.
| Month | Typical Seattle garden work |
|---|---|
| Jan | Plan the season, order seeds, start slow crops (onions from seed) indoors under lights. |
| Feb | Start peppers and early tomatoes indoors ~6-8 weeks before last frost; harden off later crops. |
| Mar | Start warm crops indoors; sow hardy greens (lettuce, spinach, radish) as soil dries. |
| Apr | Around the 04/05 last frost, harden off and transplant warm crops; direct-sow beans and corn. |
| May | Direct-sow the rest of the warm season (tomatoes, peppers, cucumbers, squash); keep transplants watered and mulched. |
| Jun | Keep up with harvests (lettuce, radishes, peas); succession-sow beans and quick greens. |
| Jul | Plant fall brassicas (broccoli, kale) for autumn; keep watering steady through heat. |
| Aug | Start fall greens; sow carrots and beets for late harvest; stay on top of pests. |
| Sep | Plant fall crops of lettuce and spinach; harvest summer crops at peak. |
| Oct | Harvest tender crops before frost; plant garlic; protect late tomatoes. |
| Nov | Clean up beds, add compost, cover soil; store root crops; plan cover crops. |
| Dec | Order next year's seeds; review what worked; start spring garden notes. |