Frost dates for Fosston 1 E, MN
At Fosston 1 E, the median last spring frost (32°F) is May 15 and the median first fall frost is Sep 26, for a typical growing season of 132 days. For a 90% chance that the last frost has passed, wait until May 30. Nearby ZIP codes are in USDA hardiness zone 3b.
- May 15Last spring frost (median)50% chance of 32°F after this date
- May 30Safer planting date10% chance of 32°F after this date
- Sep 26First fall frost (median)50% chance of 32°F by this date
- 132 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | May 13 | May 27 | Jun 17 |
| 32°F | May 2 | May 15 | May 30 |
| 28°F | Apr 20 | May 4 | May 20 |
| 24°F | Apr 9 | Apr 24 | May 9 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Aug 28 | Sep 14 | Sep 28 |
| 32°F | Sep 10 | Sep 26 | Oct 8 |
| 28°F | Sep 23 | Oct 5 | Oct 22 |
| 24°F | Oct 2 | Oct 18 | Nov 1 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 79 days | 109 days | 130 days |
| 32°F | 109 days | 132 days | 152 days |
| 28°F | 131 days | 152 days | 173 days |
| 24°F | 152 days | 173 days | 194 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 56542 | 3b | -35 to -30°F | 1 km |
| 56651 | 3b | -35 to -30°F | 15 km |
| 56556 | 3b | -35 to -30°F | 16 km |
| 56592 | 3b | -35 to -30°F | 22 km |
| 56646 | 3b | -35 to -30°F | 25 km |
| 56535 | 3b | -35 to -30°F | 27 km |
| 56634 | 3b | -35 to -30°F | 28 km |
| 56644 | 3b | -35 to -30°F | 29 km |
| 56684 | 3b | -35 to -30°F | 34 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00212916, at 47.5639, -95.7247, elevation 396 m (1,300 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 195.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mahnomen (33 km)
- Red Lake Falls (55 km)
- Itasca Univ Of Minn (55 km)
- Red Lake Indian Agcy (63 km)
- Ada (66 km)
- Tamarac Wildlife Re (68 km)
- Thief River Falls 2 (72 km)
- Crookston NW Exp. Station (72 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.