Frost dates for Hamer 4 NW, ID
At Hamer 4 NW, the median last spring frost (32°F) is Jun 3 and the median first fall frost is Sep 11, for a typical growing season of 98 days. For a 90% chance that the last frost has passed, wait until Jun 21. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- Jun 3Last spring frost (median)50% chance of 32°F after this date
- Jun 21Safer planting date10% chance of 32°F after this date
- Sep 11First fall frost (median)50% chance of 32°F by this date
- 98 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 |
|---|---|---|---|
| 32°F | May 15 | Jun 3 | Jun 21 |
| 28°F | May 2 | May 14 | Jun 2 |
| 24°F | Apr 17 | May 1 | May 14 |
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 |
|---|---|---|---|
| 32°F | Aug 30 | Sep 11 | Sep 24 |
| 28°F | Sep 5 | Sep 21 | Oct 6 |
| 24°F | Sep 16 | Oct 3 | Oct 17 |
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 | 48 days | 70 days | 92 days |
| 32°F | 76 days | 98 days | 122 days |
| 28°F | 104 days | 127 days | 149 days |
| 24°F | 131 days | 154 days | 175 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 |
|---|---|---|---|
| 83425 | 5a | -20 to -15°F | 5 km |
| 83450 | 4b | -25 to -20°F | 17 km |
| 83444 | 5a | -20 to -15°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 USC00103964, at 43.9664, -112.2642, elevation 1460 m (4,790 ft).
- Data quality: Representative (10+ years), 26 years of freeze data.
- Average days per year at or below 32°F: 205.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Monteview (25 km)
- Dubois Exp. Station (31 km)
- Small 6n (38 km)
- Rexburg Madison Co Airport (40 km)
- Rexburg Byu Idaho (42 km)
- Rigby (43 km)
- Sugar City (43 km)
- Saint Anthony (47 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.