Frost dates for Wright 3 E, MN
At Wright 3 E, the median last spring frost (32°F) is May 31 and the median first fall frost is Sep 18, for a typical growing season of 107 days. For a 90% chance that the last frost has passed, wait until Jun 20. Nearby ZIP codes are in USDA hardiness zone 4a.
- May 31Last spring frost (median)50% chance of 32°F after this date
- Jun 20Safer planting date10% chance of 32°F after this date
- Sep 18First fall frost (median)50% chance of 32°F by this date
- 107 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 |
|---|---|---|---|
| 32°F | May 15 | May 31 | Jun 20 |
| 28°F | May 2 | May 17 | Jun 1 |
| 24°F | Apr 21 | May 3 | May 21 |
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 |
|---|---|---|---|
| 32°F | Sep 1 | Sep 18 | Oct 2 |
| 28°F | Sep 13 | Sep 28 | Oct 13 |
| 24°F | Sep 22 | Oct 9 | Oct 27 |
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 | 45 days | 75 days | 102 days |
| 32°F | 80 days | 107 days | 129 days |
| 28°F | 109 days | 133 days | 154 days |
| 24°F | 135 days | 157 days | 179 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 |
|---|---|---|---|
| 55798 | 4a | -30 to -25°F | 5 km |
| 55726 | 4a | -30 to -25°F | 10 km |
| 55787 | 4a | -30 to -25°F | 13 km |
| 55757 | 4a | -30 to -25°F | 17 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 USC00219173, at 46.6803, -92.9542, elevation 405 m (1,330 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 190.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sandy Lake Dam Libby (31 km)
- Moose Lake 1 SSE (31 km)
- Cloquet (33 km)
- Floodwood 3 NE (33 km)
- Bruno 7ene (53 km)
- Aitkin 2e (57 km)
- Isle 12n (58 km)
- Duluth NWS (59 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.