Frost dates in Washington

Washington cities

• Frost dates in Seattle: last frost March 8, first frost November 23
• Frost dates in Spokane: last frost April 26, first frost October 15
• Frost dates in Tacoma: last frost March 11, first frost November 21
• Frost dates in Vancouver: last frost March 29, first frost November 9
• Frost dates in Bellevue: last frost March 8, first frost November 23

Find yours by ZIP code

The table below is by weather station. For the station nearest you, and your planting zone, type your ZIP code.

Washington frost dates by weather station

The average date is NOAA's 50% date: half of years have a later last frost, or an earlier first one. Plan by the 1-in-10 date if a freeze would cost you plants. Stations are NOAA's main weather stations, mostly airports. “Zone nearby” is the USDA 2023 zone of the nearest ZIP code within 10 miles. NOAA counts the frost season from August to July, so in the warmest places the “first fall” freeze lands after New Year.

How these dates work

Frost dates come from NOAA's 1991 to 2020 Climate Normals, which work out from each weather station's daily lows how likely the last spring freeze and the first fall freeze (32 °F) are by each date. We use the station nearest the middle of your ZIP code and show its height and distance, since a station on a hill or by a lake can differ from your yard.

The average date is the 50% date: half of years have a freeze after the spring date or before the fall one. The 1-in-10 dates are NOAA's 10% dates, the ones to plan by if a late freeze would cost you plants. Within one yard, cold air pools in low spots while walls and paving hold heat, so some corners freeze before others.

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Where the numbers come from

• USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture
• PRISM Climate Group, Oregon State University (zone data)
• NOAA NCEI, U.S. Climate Normals 1991–2020, annual/seasonal
• NOAA, Normals calculation methodology (frost-freeze probability dates)
• US Census Bureau, 2025 ZCTA gazetteer (ZIP code centers)