Frost dates for Fortuna 1 W, ND
At this NOAA station the last spring frost (32°F) usually comes by May 19 and the first fall frost around September 17, giving a growing season of about 121 days.
May 19average last spring frost
September 17average first fall frost
JanAprJulOctDec
Frost odds
| 1 year in 10 the last spring frost is later than | May 31 |
| Half of years the last spring frost is later than | May 19 |
| 9 years in 10 the last spring frost is later than | May 8 |
| 1 year in 10 the first fall frost is earlier than | September 4 |
| Half of years the first fall frost is earlier than | September 17 |
| 9 years in 10 the first fall frost is earlier than | September 28 |
A hard freeze (28°F) usually ends by May 10 and returns around September 26.
A light frost (36°F, which can still nip tender plants) usually ends by May 29 and returns around September 8.
Station USC00323196, elevation 716 m. Based on 29 years of 1991 to 2020 records. A garden higher up, in a hollow or far from this station can freeze later in spring.
Check another ZIP
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