When should I plant tomatoes in ZIP 98101?

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

Is this a guaranteed planting date?

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

ZIP 98101 planting calendar

In ZIP 98101, plant tomatoes around Mar 27.

Your Seattle calendar has a 245-day estimated frost-free season. This estimate uses the representative Seattle frost station, USDA zone 9a, and tomatoes timing rules.

USDA zone 9a Seattle frost station Washington State University Extension Updated 2026-06-28

Read the method

Season map

Tomatoes windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Feb 6

Transplant

Mar 27

Harvest

Jun 13

Frost watch

Sep 3

Reminder workflow

Every date has a next action

Start tomatoes indoorsFeb 6

Last frost windowMar 20

Transplant tomatoesMar 27

First tomatoes harvest windowJun 13

Last tomatoes sowing targetSep 3

Signal	Value	Why it matters
Last frost estimate	March 20, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	November 20, 2026	Fall planting counts backward from this date.
Season length	245 days	Longer seasons can support succession crops.
Spacing	18-24 in	Airflow and root space affect yield.
Soil temperature	60 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Seattle frost history and USDA zone 9a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

Washington State University Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Tomatoes timing notes

Harden seedlings off for a week before transplanting. Tomatoes prefers full sun, 18-24 in spacing, and soil near 60 F+.

For fall, count backward from Nov 20. A conservative last sowing target is around Sep 3.