Frost dates for Rhinelander Oneida Airport, WI
At Rhinelander Oneida Airport, the median last spring frost (32°F) is May 26 and the median first fall frost is Sep 23, for a typical growing season of 120 days. For a 90% chance that the last frost has passed, wait until Jun 8. Nearby ZIP codes are in USDA hardiness zones 4a to 4b.
- May 26Last spring frost (median)50% chance of 32°F after this date
- Jun 8Safer planting date10% chance of 32°F after this date
- Sep 23First fall frost (median)50% chance of 32°F by this date
- 120 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 5 | Jun 21 |
| 32°F | May 9 | May 26 | Jun 8 |
| 28°F | Apr 28 | May 13 | May 29 |
| 24°F | Apr 13 | Apr 30 | May 16 |
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 23 | Sep 9 | Sep 26 |
| 32°F | Sep 5 | Sep 23 | Oct 7 |
| 28°F | Sep 17 | Oct 2 | Oct 19 |
| 24°F | Sep 28 | Oct 14 | Nov 1 |
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 | 71 days | 96 days | 117 days |
| 32°F | 99 days | 120 days | 142 days |
| 28°F | 122 days | 142 days | 165 days |
| 24°F | 141 days | 166 days | 189 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 |
|---|---|---|---|
| 54501 | 4b | -25 to -20°F | 10 km |
| 54529 | 4a | -30 to -25°F | 17 km |
| 54539 | 4a | -30 to -25°F | 22 km |
| 54463 | 4b | -25 to -20°F | 23 km |
| 54487 | 4a | -30 to -25°F | 25 km |
| 54531 | 4a | -30 to -25°F | 28 km |
| 54435 | 4b | -25 to -20°F | 30 km |
| 54428 | 4b | -25 to -20°F | 32 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 USW00004803, at 45.6308, -89.4653, elevation 487 m (1,599 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 185.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rhinelander (4 km)
- Rhinelander 4ne (13 km)
- North Pelican (17 km)
- Rice Rsvr Tomahawk-2 (23 km)
- Willow Rsvr (31 km)
- St. Germain (32 km)
- Minocqua (35 km)
- Eagle River (36 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.