Frost dates for Hazelton, ID
At Hazelton, the median last spring frost (32°F) is May 7 and the median first fall frost is Oct 5, for a typical growing season of 149 days. For a 90% chance that the last frost has passed, wait until May 26. Nearby ZIP codes are in USDA hardiness zone 6b.
- May 7Last spring frost (median)50% chance of 32°F after this date
- May 26Safer planting date10% chance of 32°F after this date
- Oct 5First fall frost (median)50% chance of 32°F by this date
- 149 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 7 | May 25 | Jun 12 |
| 32°F | Apr 24 | May 7 | May 26 |
| 28°F | Apr 6 | Apr 23 | May 8 |
| 24°F | Mar 10 | Apr 4 | Apr 25 |
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 6 |
| 32°F | Sep 19 | Oct 5 | Oct 19 |
| 28°F | Oct 2 | Oct 17 | Nov 1 |
| 24°F | Oct 14 | Oct 28 | Nov 13 |
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 | 95 days | 119 days | 140 days |
| 32°F | 126 days | 149 days | 169 days |
| 28°F | 154 days | 176 days | 200 days |
| 24°F | 183 days | 208 days | 236 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 |
|---|---|---|---|
| 83335 | 6b | -5 to 0°F | 5 km |
| 83325 | 6b | -5 to 0°F | 8 km |
| 83344 | 6b | -5 to 0°F | 21 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 USC00104140, at 42.5972, -114.1378, elevation 1238 m (4,060 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 157.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Twin Falls 6 E (18 km)
- Twin Falls-Kmvt (26 km)
- Jerome Co Airport (30 km)
- Paul 1ene (31 km)
- Burley Muni Airport (31 km)
- Twin Falls Sun Valley Regional Airport (31 km)
- Jerome (35 km)
- Shoshone 1 WNW (44 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.