Question 1

When should I plant tomatoes in ZIP 20001?

Accepted Answer

In ZIP 20001, the main tomatoes target is around Apr 22, based on the representative Washington frost station and USDA zone 7b.

Question 2

When should I start tomatoes seeds indoors in 20001?

Accepted Answer

Start tomatoes seeds indoors in ZIP 20001 around Mar 4, about 42 days before the Apr 15 last-frost estimate.

Question 3

When is the last frost in Washington?

Accepted Answer

Washington (ZIP 20001) has an average last spring frost around Apr 15, based on the representative Washington frost station.

Question 4

When is the first frost in Washington?

Accepted Answer

Washington (ZIP 20001) has an average first fall frost around Nov 5, leaving about 204 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	March 4, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	April 22, 2026	Move hardened-off seedlings outside after the frost-risk window.

Start tomatoes seeds indoors around Mar 4

Tomatoes dates for Washington, DC