Frost dates for Alexandria Muni Airport, MN
At Alexandria Muni Airport, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 8, for a typical growing season of 159 days. For a 90% chance that the last frost has passed, wait until May 15. Nearby ZIP codes are in USDA hardiness zones 4a to 4b.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 15Safer planting date10% chance of 32°F after this date
- Oct 8First fall frost (median)50% chance of 32°F by this date
- 159 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 | Apr 30 | May 11 | May 27 |
| 32°F | Apr 18 | May 2 | May 15 |
| 28°F | Apr 8 | Apr 21 | May 4 |
| 24°F | Apr 2 | Apr 13 | Apr 26 |
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 18 | Sep 30 | Oct 12 |
| 32°F | Sep 27 | Oct 8 | Oct 20 |
| 28°F | Oct 5 | Oct 19 | Oct 31 |
| 24°F | Oct 14 | Oct 29 | Nov 10 |
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 | 121 days | 140 days | 157 days |
| 32°F | 140 days | 159 days | 177 days |
| 28°F | 159 days | 178 days | 199 days |
| 24°F | 177 days | 198 days | 217 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 |
|---|---|---|---|
| 56308 | 4b | -25 to -20°F | 0 km |
| 56332 | 4b | -25 to -20°F | 14 km |
| 56355 | 4a | -30 to -25°F | 14 km |
| 56315 | 4b | -25 to -20°F | 20 km |
| 56319 | 4a | -30 to -25°F | 21 km |
| 56354 | 4a | -30 to -25°F | 23 km |
| 56343 | 4b | -25 to -20°F | 26 km |
| 56326 | 4b | -25 to -20°F | 29 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 USW00014910, at 45.8678, -95.3942, elevation 432 m (1,416 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 167.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Glenwood 2wnw (24 km)
- Long Prairie (41 km)
- Morris W Cntrl Rsch & Outreach (48 km)
- Melrose (51 km)
- Wadena 3 S (61 km)
- Ottertail (62 km)
- Benson (64 km)
- New London (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.