Frost dates in Spokane, Washington
NOAA 1991–2020 normals for a 32 °F freeze. Low spots and the edge of town run colder than downtown.
Short answer
The average last spring frost in Spokane is April 26, and the average first fall frost is October 15, from NOAA's Spokane Felts Fld station, 5 miles from the middle of Spokane. 1 year in 10 the last frost comes after May 10, and the first one by September 30. That leaves about 172 frost-free days. Spokane is in USDA planting zone 7a.
Weather stations around Spokane
The first row is the date most people in Spokane go by. The others show how far the dates move across the area.
| Station | Last spring frost | First fall frost | Frost-free |
|---|---|---|---|
| Spokane Felts Fld 5 mi away, 1,953 ft | April 26 1 in 10 after May 10 | October 15 1 in 10 by September 30 | 172 days |
| Spokane Intl Airport 5 mi away, 2,353 ft | April 26 1 in 10 after May 10 | October 12 1 in 10 by September 29 | 169 days |
| Spokane Wfo 9 mi away, 2,392 ft | May 10 1 in 10 after May 30 | September 26 1 in 10 by September 11 | 139 days |
| Spokane 17 SSW 18 mi away, 2,267 ft | May 30 1 in 10 after July 13 | September 4 1 in 10 by August 21 | 97 days |
| Deer Park Airport 21 mi away, 2,191 ft | May 22 1 in 10 after June 15 | September 14 1 in 10 by August 28 | 115 days |
Distances are from the middle of Spokane as the Census Bureau maps it. 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. The planting zone is the USDA 2023 zone for ZIP code 99201, at the middle of the city.
Your exact ZIP code
Spokane covers a lot of ground. For the station nearest your own street, and its planting zone, type your ZIP code.
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.
More frost dates
All of Washington, station by station.
Other Washington cities: Seattle · Tacoma · Vancouver · Bellevue
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)
- US Census Bureau, 2025 city population estimates and place gazetteer