Frost dates for Eagle River, WI
At Eagle River, the median last spring frost (32°F) is May 25 and the median first fall frost is Sep 24, for a typical growing season of 121 days. For a 90% chance that the last frost has passed, wait until Jun 6. Nearby ZIP codes are in USDA hardiness zones 4a to 4b.
- May 25Last spring frost (median)50% chance of 32°F after this date
- Jun 6Safer planting date10% chance of 32°F after this date
- Sep 24First fall frost (median)50% chance of 32°F by this date
- 121 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 23 | Jun 4 | Jun 20 |
| 32°F | May 10 | May 25 | Jun 6 |
| 28°F | Apr 30 | May 13 | May 26 |
| 24°F | Apr 19 | May 2 | May 15 |
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 26 | Sep 12 | Sep 27 |
| 32°F | Sep 8 | Sep 24 | Oct 7 |
| 28°F | Sep 20 | Oct 5 | Oct 20 |
| 24°F | Oct 2 | Oct 17 | 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 | 73 days | 97 days | 118 days |
| 32°F | 101 days | 121 days | 141 days |
| 28°F | 124 days | 144 days | 163 days |
| 24°F | 145 days | 166 days | 187 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 |
|---|---|---|---|
| 54521 | 4b | -25 to -20°F | 0 km |
| 54519 | 4b | -25 to -20°F | 15 km |
| 54562 | 4b | -25 to -20°F | 19 km |
| 54554 | 4b | -25 to -20°F | 22 km |
| 54540 | 4a | -30 to -25°F | 28 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 USC00472314, at 45.9169, -89.2564, elevation 495 m (1,623 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 191.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- St. Germain (18 km)
- Rhinelander 4ne (30 km)
- North Pelican (31 km)
- Rhinelander Oneida Airport (36 km)
- Minocqua (37 km)
- Rhinelander (38 km)
- Willow Rsvr (51 km)
- Rest Lake (53 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.