Question 1

When should I plant tomatoes in ZIP 98101?

Accepted Answer

In ZIP 98101, the main tomatoes target is around Mar 27, based on the representative Seattle frost station and USDA zone 9a.

Question 2

When should I start tomatoes seeds indoors in 98101?

Accepted Answer

Start tomatoes seeds indoors in ZIP 98101 around Feb 6, about 42 days before the Mar 20 last-frost estimate.

Question 3

When is the last frost in Seattle?

Accepted Answer

Seattle (ZIP 98101) has an average last spring frost around Mar 20, based on the representative Seattle frost station.

Question 4

When is the first frost in Seattle?

Accepted Answer

Seattle (ZIP 98101) has an average first fall frost around Nov 20, leaving about 245 frost-free days.

Question 5

Is this a guaranteed planting date?

Accepted Answer

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

Step	Date	How to use it
Start Indoors	February 6, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	March 27, 2026	Move hardened-off seedlings outside after the frost-risk window.

Start tomatoes seeds indoors around Feb 6

Tomatoes dates for Seattle, WA