Frost dates for Pocatello Regional Airport, ID
At Pocatello Regional Airport, the median last spring frost (32°F) is May 23 and the median first fall frost is Sep 18, for a typical growing season of 117 days. For a 90% chance that the last frost has passed, wait until Jun 13. Nearby ZIP codes are in USDA hardiness zones 5b to 6b.
- May 23Last spring frost (median)50% chance of 32°F after this date
- Jun 13Safer planting date10% chance of 32°F after this date
- Sep 18First fall frost (median)50% chance of 32°F by this date
- 117 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 11 | Jun 28 |
| 32°F | May 6 | May 23 | Jun 13 |
| 28°F | Apr 21 | May 6 | May 23 |
| 24°F | Apr 2 | Apr 22 | May 9 |
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 25 | Sep 7 | Sep 21 |
| 32°F | Sep 3 | Sep 18 | Oct 4 |
| 28°F | Sep 14 | Oct 1 | Oct 16 |
| 24°F | Sep 27 | Oct 15 | 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 | 65 days | 86 days | 107 days |
| 32°F | 91 days | 117 days | 142 days |
| 28°F | 124 days | 147 days | 169 days |
| 24°F | 150 days | 176 days | 202 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 |
|---|---|---|---|
| 83204 | 6a | -10 to -5°F | 13 km |
| 83209 | 6a | -10 to -5°F | 14 km |
| 83201 | 6b | -5 to 0°F | 16 km |
| 83203 | 5b | -15 to -10°F | 16 km |
| 83202 | 6a | -10 to -5°F | 18 km |
| 83277 | 5b | -15 to -10°F | 19 km |
| 83210 | 5b | -15 to -10°F | 27 km |
| 83245 | 6a | -10 to -5°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 USW00024156, at 42.9203, -112.5711, elevation 1365 m (4,478 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 167.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Pocatello City (11 km)
- Pocatello 2 NE (14 km)
- Fort Hall 1 NNE (19 km)
- Aberdeen Exp. Station (21 km)
- American Falls (23 km)
- American Falls 6 NE (26 km)
- Blackfoot Fire Dept (35 km)
- McCammon (43 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.