Frost dates for Malad City, ID
At Malad City, the median last spring frost (32°F) is May 22 and the median first fall frost is Sep 20, for a typical growing season of 116 days. For a 90% chance that the last frost has passed, wait until Jun 16. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 22Last spring frost (median)50% chance of 32°F after this date
- Jun 16Safer planting date10% chance of 32°F after this date
- Sep 20First fall frost (median)50% chance of 32°F by this date
- 116 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 6 | May 22 | Jun 16 |
| 28°F | Apr 22 | May 4 | May 21 |
| 24°F | Apr 2 | Apr 19 | May 4 |
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 | Sep 4 | Sep 20 | Oct 6 |
| 28°F | Sep 14 | Oct 2 | Oct 19 |
| 24°F | Sep 27 | Oct 16 | 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 | 63 days | 87 days | 110 days |
| 32°F | 89 days | 116 days | 141 days |
| 28°F | 122 days | 150 days | 169 days |
| 24°F | 156 days | 178 days | 203 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 |
|---|---|---|---|
| 83252 | 6a | -10 to -5°F | 10 km |
| 83228 | 6b | -5 to 0°F | 21 km |
| 84331 | 6a | -10 to -5°F | 24 km |
| 83243 | 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 USW00024151, at 42.1492, -112.2872, elevation 1362 m (4,470 ft).
- Data quality: Representative (10+ years), 22 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
- Downey (34 km)
- Preston (34 km)
- McCammon (56 km)
- Lava Hot Springs (57 km)
- Grace (67 km)
- Bern (77 km)
- Lifton Pumping Station (80 km)
- Soda Springs Airport (80 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.