Frost dates for Pierce, ID
At Pierce, the median last spring frost (32°F) is Jun 3 and the median first fall frost is Sep 7, for a typical growing season of 93 days. For a 90% chance that the last frost has passed, wait until Jun 29. Nearby ZIP codes are in USDA hardiness zone 6b.
- Jun 3Last spring frost (median)50% chance of 32°F after this date
- Jun 29Safer planting date10% chance of 32°F after this date
- Sep 7First fall frost (median)50% chance of 32°F by this date
- 93 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 17 | Jun 3 | Jun 29 |
| 28°F | Apr 27 | May 10 | May 25 |
| 24°F | Apr 1 | Apr 20 | May 6 |
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 22 | Sep 7 | Sep 26 |
| 28°F | Sep 7 | Sep 26 | Oct 11 |
| 24°F | Sep 25 | Oct 11 | 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 | 29 days | 51 days | 75 days |
| 32°F | 67 days | 93 days | 118 days |
| 28°F | 113 days | 136 days | 160 days |
| 24°F | 149 days | 174 days | 200 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 |
|---|---|---|---|
| 83553 | 6b | -5 to 0°F | 13 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 USC00107046, at 46.4922, -115.8006, elevation 939 m (3,080 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 216.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Headquarters (15 km)
- Kamiah (34 km)
- Dworshak Fish Hatchery (40 km)
- Lowell Three Rivers (42 km)
- Elk River (43 km)
- Nezperce (45 km)
- Kooskia 5 SSE (48 km)
- Fenn Ranger Station (49 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.