GrowZone

Frost dates Hardiness zones What to plant now Browse by state Methodology Guides Saved About

State frost hub

First and last frost dates in Washington by ZIP code

ZIP	City	Last frost	First frost	Zone
98101	Seattle	Mar 20	Nov 20	9a

GrowZone

ZIP-precise planting estimates from frost windows, USDA zones, and crop timing rules. Verify locally before planting high-value crops.

Methodology Privacy Terms Affiliate disclosure Advertising policy

Essential storage saves calendars. Optional analytics or ads load only after consent and approved tags exist.