Frost dates for Leech Lake, MN
At Leech Lake, the median last spring frost (32°F) is May 8 and the median first fall frost is Oct 1, for a typical growing season of 144 days. For a 90% chance that the last frost has passed, wait until May 23. Nearby ZIP codes are in USDA hardiness zone 3b.
- May 8Last spring frost (median)50% chance of 32°F after this date
- May 23Safer planting date10% chance of 32°F after this date
- Oct 1First fall frost (median)50% chance of 32°F by this date
- 144 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 6 | May 21 | Jun 4 |
| 32°F | Apr 28 | May 8 | May 23 |
| 28°F | Apr 17 | Apr 30 | May 14 |
| 24°F | Apr 7 | Apr 21 | May 3 |
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 6 | Sep 22 | Oct 4 |
| 32°F | Sep 19 | Oct 1 | Oct 17 |
| 28°F | Oct 1 | Oct 15 | Oct 29 |
| 24°F | Oct 11 | Oct 27 | 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 | 102 days | 123 days | 141 days |
| 32°F | 125 days | 144 days | 164 days |
| 28°F | 148 days | 168 days | 187 days |
| 24°F | 169 days | 188 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 |
|---|---|---|---|
| 56641 | 3b | -35 to -30°F | 6 km |
| 56626 | 3b | -35 to -30°F | 15 km |
| 56672 | 3b | -35 to -30°F | 26 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 USC00214652, at 47.2467, -94.2228, elevation 397 m (1,302 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 180.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Walker (32 km)
- Cass Lake (33 km)
- Deep Portage (41 km)
- Pokegama Dam (48 km)
- Blackduck (52 km)
- Grand Rpds Forest Lab (55 km)
- Marcell 5ne (61 km)
- Pine River Dam (65 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.