Frost dates for Lowell Three Rivers, ID
At Lowell Three Rivers, the median last spring frost (32°F) is Apr 16 and the median first fall frost is Oct 25, for a typical growing season of 191 days. For a 90% chance that the last frost has passed, wait until May 4. Nearby ZIP codes are in USDA hardiness zones 5b to 7a.
- Apr 16Last spring frost (median)50% chance of 32°F after this date
- May 4Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 191 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 | Apr 23 | May 5 | May 19 |
| 32°F | Mar 26 | Apr 16 | May 4 |
| 28°F | Feb 26 | Mar 17 | Apr 9 |
| 24°F | Jan 31 | Feb 26 | Mar 16 |
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 | Sep 21 | Oct 8 | Oct 25 |
| 32°F | Oct 5 | Oct 25 | Nov 13 |
| 28°F | Oct 19 | Nov 10 | Dec 1 |
| 24°F | Oct 28 | Nov 23 | Dec 14 |
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 | 132 days | 155 days | 175 days |
| 32°F | 163 days | 191 days | 220 days |
| 28°F | 205 days | 236 days | 266 days |
| 24°F | 237 days | 270 days | 304 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 |
|---|---|---|---|
| 83552 | 7a | 0 to 5°F | 31 km |
| 83536 | 7a | 0 to 5°F | 34 km |
| 83553 | 6b | -5 to 0°F | 36 km |
| 83530 | 6b | -5 to 0°F | 41 km |
| 83525 | 5b | -15 to -10°F | 48 km |
| 83533 | 6b | -5 to 0°F | 50 km |
| 83546 | 6a | -10 to -5°F | 50 km |
| 83543 | 6b | -5 to 0°F | 51 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 USW00004109, at 46.1442, -115.5964, elevation 451 m (1,480 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 95.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Fenn Ranger Station (7 km)
- Kooskia 5 SSE (27 km)
- Kamiah (35 km)
- Elk City 1ne (36 km)
- Pierce (42 km)
- Grangeville (46 km)
- Nezperce (51 km)
- Red River Ranger Station (52 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.