Frost dates for Lowman, ID
At Lowman, the median last spring frost (32°F) is Jun 6 and the median first fall frost is Sep 4, for a typical growing season of 87 days. For a 90% chance that the last frost has passed, wait until Jul 1. Nearby ZIP codes are in USDA hardiness zones 6a to 7a.
- Jun 6Last spring frost (median)50% chance of 32°F after this date
- Jul 1Safer planting date10% chance of 32°F after this date
- Sep 4First fall frost (median)50% chance of 32°F by this date
- 87 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 18 | Jun 6 | Jul 1 |
| 28°F | Apr 30 | May 15 | Jun 4 |
| 24°F | Apr 2 | Apr 30 | May 18 |
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 19 | Sep 4 | Sep 24 |
| 28°F | Sep 4 | Sep 23 | Oct 8 |
| 24°F | Sep 18 | Oct 5 | Oct 21 |
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 | 29 days | 49 days | 72 days |
| 32°F | 60 days | 87 days | 116 days |
| 28°F | 100 days | 129 days | 154 days |
| 24°F | 131 days | 159 days | 191 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 |
|---|---|---|---|
| 83622 | 6b | -5 to 0°F | 21 km |
| 83631 | 6b | -5 to 0°F | 25 km |
| 83666 | 6b | -5 to 0°F | 31 km |
| 83637 | 6a | -10 to -5°F | 37 km |
| 83602 | 7a | 0 to 5°F | 42 km |
| 83716 | 6b | -5 to 0°F | 43 km |
| 83629 | 7a | 0 to 5°F | 45 km |
| 83670 | 7a | 0 to 5°F | 56 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 USC00105414, at 44.0828, -115.6186, elevation 1195 m (3,920 ft).
- Data quality: Representative (10+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 211.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Garden Valley (28 km)
- Idaho City (32 km)
- Deadwood Lodge (42 km)
- Ola (54 km)
- Stanley Ranger Station (56 km)
- Stanley (57 km)
- Arrowrock Dam (60 km)
- Cascade 1 NW (60 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.