Frost dates for Wheaton, MN
At Wheaton, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 9, for a typical growing season of 160 days. For a 90% chance that the last frost has passed, wait until May 12. Nearby ZIP codes are in USDA hardiness zone 4b.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 12Safer planting date10% chance of 32°F after this date
- Oct 9First fall frost (median)50% chance of 32°F by this date
- 160 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 28 | May 9 | May 21 |
| 32°F | Apr 18 | May 1 | May 12 |
| 28°F | Apr 8 | Apr 21 | May 3 |
| 24°F | Mar 31 | Apr 12 | Apr 25 |
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 19 | Sep 30 | Oct 13 |
| 32°F | Sep 26 | Oct 9 | Oct 23 |
| 28°F | Oct 5 | Oct 20 | Nov 1 |
| 24°F | Oct 14 | Oct 30 | Nov 11 |
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 | 127 days | 144 days | 160 days |
| 32°F | 145 days | 160 days | 179 days |
| 28°F | 161 days | 179 days | 199 days |
| 24°F | 179 days | 199 days | 218 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 |
|---|---|---|---|
| 56296 | 4b | -25 to -20°F | 3 km |
| 56236 | 4b | -25 to -20°F | 18 km |
| 56274 | 4b | -25 to -20°F | 22 km |
| 56248 | 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 USC00218907, at 45.8081, -96.5042, elevation 310 m (1,018 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 166.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- White Rock Dam (8 km)
- Browns Valley (35 km)
- Morris W Cntrl Rsch & Outreach (55 km)
- Breckenridge 3e (55 km)
- Artichoke Lake 1 E (55 km)
- Fergus Falls (62 km)
- Rothsay (77 km)
- Glenwood 2wnw (84 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.