Frost dates for Fergus Falls, MN
At Fergus Falls, the median last spring frost (32°F) is May 4 and the median first fall frost is Oct 5, for a typical growing season of 152 days. For a 90% chance that the last frost has passed, wait until May 18. Nearby ZIP codes are in USDA hardiness zones 4a to 4b.
- May 4Last spring frost (median)50% chance of 32°F after this date
- May 18Safer planting date10% chance of 32°F after this date
- Oct 5First fall frost (median)50% chance of 32°F by this date
- 152 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 2 | May 14 | May 29 |
| 32°F | Apr 20 | May 4 | May 18 |
| 28°F | Apr 9 | Apr 26 | May 8 |
| 24°F | Apr 2 | Apr 15 | Apr 30 |
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 | Sep 13 | Sep 27 | Oct 9 |
| 32°F | Sep 22 | Oct 5 | Oct 19 |
| 28°F | Oct 1 | Oct 15 | Oct 28 |
| 24°F | Oct 10 | Oct 25 | Nov 8 |
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 | 116 days | 134 days | 152 days |
| 32°F | 134 days | 152 days | 172 days |
| 28°F | 151 days | 172 days | 193 days |
| 24°F | 172 days | 193 days | 213 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 |
|---|---|---|---|
| 56537 | 4a | -30 to -25°F | 3 km |
| 56533 | 4a | -30 to -25°F | 12 km |
| 56324 | 4a | -30 to -25°F | 21 km |
| 56586 | 4a | -30 to -25°F | 22 km |
| 56590 | 4a | -30 to -25°F | 29 km |
| 56309 | 4b | -25 to -20°F | 34 km |
| 56531 | 4b | -25 to -20°F | 35 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 USC00212768, at 46.2919, -96.1172, elevation 381 m (1,250 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 174.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rothsay (25 km)
- Breckenridge 3e (31 km)
- Ottertail (46 km)
- White Rock Dam (59 km)
- Wheaton (62 km)
- New York Mills (62 km)
- Detroit Lakes 1 NNE (64 km)
- Alexandria Muni Airport (73 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.