Frost dates for Melrose, MN
At Melrose, the median last spring frost (32°F) is May 4 and the median first fall frost is Oct 1, for a typical growing season of 148 days. For a 90% chance that the last frost has passed, wait until May 19. 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 19Safer planting date10% chance of 32°F after this date
- Oct 1First fall frost (median)50% chance of 32°F by this date
- 148 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 1 | May 14 | May 29 |
| 32°F | Apr 22 | May 4 | May 19 |
| 28°F | Apr 13 | Apr 26 | May 8 |
| 24°F | Apr 5 | Apr 17 | 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 11 | Sep 23 | Oct 5 |
| 32°F | Sep 17 | Oct 1 | Oct 15 |
| 28°F | Sep 27 | Oct 12 | Oct 26 |
| 24°F | Oct 4 | Oct 22 | Nov 5 |
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 | 111 days | 130 days | 148 days |
| 32°F | 129 days | 148 days | 165 days |
| 28°F | 148 days | 166 days | 186 days |
| 24°F | 166 days | 187 days | 207 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 |
|---|---|---|---|
| 56352 | 4b | -25 to -20°F | 4 km |
| 56356 | 4a | -30 to -25°F | 8 km |
| 56335 | 4b | -25 to -20°F | 10 km |
| 56331 | 4b | -25 to -20°F | 10 km |
| 56378 | 4b | -25 to -20°F | 15 km |
| 56336 | 4b | -25 to -20°F | 16 km |
| 56376 | 4b | -25 to -20°F | 22 km |
| 56384 | 4b | -25 to -20°F | 23 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 USC00215325, at 45.6772, -94.8019, elevation 364 m (1,195 ft).
- Data quality: Representative (10+ years), 27 years of freeze data.
- Average days per year at or below 32°F: 175.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Long Prairie (33 km)
- Collegeville St. John's (34 km)
- New London (43 km)
- Rice (47 km)
- Glenwood 2wnw (50 km)
- Alexandria Muni Airport (51 km)
- Little Falls 2nne (51 km)
- Kimball 3n (53 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.