Frost dates in Washington

Across Washington's 154 NOAA stations with a frost every year, the typical last spring frost ranges from February 26 at Olga 2 SE (80 feet above sea level) to June 6 at Davenport (2,370 feet above sea level). The middle station's date is April 23.

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Last frost across Washington

The frost-free season runs from 94 days at Davenport to 276 days at Olga 2 SE.

The station with the latest frost sits about 2,300 feet higher than the one with the earliest.

At 2 stations, all high or far north, frost is possible in every month.

These are typical dates: in half of springs the last frost comes later. Each place's page, and each ZIP code lookup, also gives the late-year date, after which only 1 spring in 10 has a frost. That's the safer date for tender plants.

Frost dates for Washington's larger places

Typical (1-in-2) dates. Each place's page has the early and late years, a planting calendar and a printable planner. Zones are for the ZIP code nearest each place's center.

Hardiness zones in Washington

Washington's 708 ZIP codes in the USDA list fall in zones 6a to 9b: 6a (2 percent), 6b (12 percent), 7a (18 percent), 7b (4 percent), 8a (7 percent), 8b (37 percent), 9a (19 percent) and 9b (under 1 percent). Compared with the 2012 map, 49 percent of them moved to a warmer half zone (7 by a full zone or more), 48 percent stayed the same and 16 moved to a colder one.

A hardiness zone is about the coldest night of winter, which decides which shrubs, trees and perennials survive. Frost dates are about spring and fall, which decide when to plant. You need both. Read more about what the zones mean and what changed in 2023.

Every NOAA station in Washington

All 156 stations in Washington with frost statistics in NOAA's 1991 to 2020 normals, from A to Z. Station names are usually a town, an airport, or a distance and direction from a town. Find one near you and at a similar elevation.

Typical (1-in-2) dates at 32°F. For the early and late years, and a planting calendar built from your own dates, look up your ZIP code.