Frost dates for Brainerd Crow Wing Co Airport, MN
At Brainerd Crow Wing Co Airport, the median last spring frost (32°F) is May 13 and the median first fall frost is Sep 27, for a typical growing season of 138 days. For a 90% chance that the last frost has passed, wait until May 27. Nearby ZIP codes are in USDA hardiness zone 4a.
- May 13Last spring frost (median)50% chance of 32°F after this date
- May 27Safer planting date10% chance of 32°F after this date
- Sep 27First fall frost (median)50% chance of 32°F by this date
- 138 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 8 | May 24 | Jun 6 |
| 32°F | Apr 29 | May 13 | May 27 |
| 28°F | Apr 17 | May 2 | May 17 |
| 24°F | Apr 7 | Apr 21 | May 6 |
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 4 | Sep 19 | Oct 1 |
| 32°F | Sep 14 | Sep 27 | Oct 12 |
| 28°F | Sep 22 | Oct 8 | Oct 22 |
| 24°F | Oct 4 | Oct 22 | Nov 3 |
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 | 96 days | 116 days | 136 days |
| 32°F | 117 days | 138 days | 157 days |
| 28°F | 138 days | 158 days | 179 days |
| 24°F | 159 days | 182 days | 202 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 |
|---|---|---|---|
| 56455 | 4a | -30 to -25°F | 11 km |
| 56444 | 4a | -30 to -25°F | 19 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 USW00094938, at 46.4047, -94.1308, elevation 372 m (1,221 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 173.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Brainerd (9 km)
- Gull Lake Dam (18 km)
- Pine River Dam (29 km)
- Aitkin 2e (38 km)
- Little Falls 2nne (48 km)
- Isle 12n (49 km)
- Deep Portage (58 km)
- Rice (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.