Frost dates for Riley 10 Wsw, OR
At this NOAA station the last spring frost (32°F) usually comes by June 11 and the first fall frost around September 11, giving a growing season of about 87 days.
June 11average last spring frost
September 11average first fall frost
JanAprJulOctDec
Frost odds
| 1 year in 10 the last spring frost is later than | July 3 |
| Half of years the last spring frost is later than | June 11 |
| 9 years in 10 the last spring frost is later than | May 24 |
| 1 year in 10 the first fall frost is earlier than | August 23 |
| Half of years the first fall frost is earlier than | September 11 |
| 9 years in 10 the first fall frost is earlier than | September 24 |
A hard freeze (28°F) usually ends by May 23 and returns around September 23.
Station USW00004128, elevation 1397 m. Based on 17 years of 1991 to 2020 records. A garden higher up, in a hollow or far from this station can freeze later in spring.
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Sources
- U.S. Annual/Seasonal Climate Normals, 1991 to 2020 (freeze probability dates by station), NOAA National Centers for Environmental Information, checked 1 November 2026
- Annual/Seasonal Normals 1991 to 2020 documentation, NOAA National Centers for Environmental Information, checked 1 November 2026
- 2024 Gazetteer Files, ZIP Code Tabulation Areas, US Census Bureau, checked 1 November 2026