Frost dates for Plummer 3 WSW, ID
At Plummer 3 WSW, the median last spring frost (32°F) is May 11 and the median first fall frost is Oct 5, for a typical growing season of 143 days. For a 90% chance that the last frost has passed, wait until Jun 4. Nearby ZIP codes are in USDA hardiness zone 6b.
- May 11Last spring frost (median)50% chance of 32°F after this date
- Jun 4Safer planting date10% chance of 32°F after this date
- Oct 5First fall frost (median)50% chance of 32°F by this date
- 143 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 15 | Jun 7 | Jun 24 |
| 32°F | Apr 25 | May 11 | Jun 4 |
| 28°F | Mar 29 | Apr 22 | May 10 |
| 24°F | Mar 5 | Mar 24 | Apr 19 |
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 20 | Oct 7 |
| 32°F | Sep 15 | Oct 5 | Oct 21 |
| 28°F | Oct 2 | Oct 19 | Nov 6 |
| 24°F | Oct 15 | Nov 1 | Nov 23 |
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 | 74 days | 103 days | 132 days |
| 32°F | 111 days | 143 days | 169 days |
| 28°F | 153 days | 181 days | 207 days |
| 24°F | 192 days | 223 days | 248 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 |
|---|---|---|---|
| 83851 | 6b | -5 to 0°F | 4 km |
| 99033 | 6b | -5 to 0°F | 14 km |
| 99018 | 6b | -5 to 0°F | 15 km |
| 83876 | 6b | -5 to 0°F | 16 km |
| 99012 | 6b | -5 to 0°F | 19 km |
| 99030 | 6b | -5 to 0°F | 22 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 USC00107188, at 47.3111, -116.9544, elevation 885 m (2,905 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 158.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Saint Maries (28 km)
- Potlatch 3 NNE (40 km)
- Coeur D'alene (43 km)
- Moscow U Of I (65 km)
- Kellogg (67 km)
- Wallace (79 km)
- Bayview Model Basin (80 km)
- Elk River (83 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.