Frost dates for Ely 25e, MN
At Ely 25e, the median last spring frost (32°F) is May 21 and the median first fall frost is Sep 25, for a typical growing season of 127 days. For a 90% chance that the last frost has passed, wait until Jun 3. Nearby ZIP codes are in USDA hardiness zones 3a to 4b.
- May 21Last spring frost (median)50% chance of 32°F after this date
- Jun 3Safer planting date10% chance of 32°F after this date
- Sep 25First fall frost (median)50% chance of 32°F by this date
- 127 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 19 | Jun 1 | Jun 15 |
| 32°F | May 6 | May 21 | Jun 3 |
| 28°F | Apr 29 | May 9 | May 23 |
| 24°F | Apr 18 | May 1 | May 12 |
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 | Aug 31 | Sep 15 | Sep 28 |
| 32°F | Sep 11 | Sep 25 | Oct 8 |
| 28°F | Sep 22 | Oct 5 | Oct 21 |
| 24°F | Oct 2 | Oct 19 | 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 | 86 days | 106 days | 124 days |
| 32°F | 106 days | 127 days | 146 days |
| 28°F | 127 days | 148 days | 167 days |
| 24°F | 149 days | 169 days | 190 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 55731 | 3b | -35 to -30°F | 23 km |
| 55796 | 3b | -35 to -30°F | 26 km |
| 55607 | 3b | -35 to -30°F | 39 km |
| 55603 | 4a | -30 to -25°F | 50 km |
| 55615 | 3b | -35 to -30°F | 51 km |
| 55706 | 3b | -35 to -30°F | 52 km |
| 55613 | 4b | -25 to -20°F | 56 km |
| 55782 | 3a | -40 to -35°F | 59 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 USC00212555, at 47.9722, -91.4492, elevation 440 m (1,444 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 193.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ely (29 km)
- Ely (31 km)
- Isabella 14w (45 km)
- Gunflint Lake 10 NW (47 km)
- Babbitt (47 km)
- Wolf Ridge Elc (61 km)
- Tower 2s (65 km)
- Lutsen 3nne (66 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.