Frost dates for Colville, WA
At Colville, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 2, for a typical growing season of 153 days. For a 90% chance that the last frost has passed, wait until May 17. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 17Safer planting date10% chance of 32°F after this date
- Oct 2First fall frost (median)50% chance of 32°F by this date
- 153 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 3 | May 17 | Jun 3 |
| 32°F | Apr 19 | May 2 | May 17 |
| 28°F | Mar 25 | Apr 15 | May 2 |
| 24°F | Mar 4 | Mar 22 | Apr 14 |
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 6 | Sep 22 | Oct 4 |
| 32°F | Sep 19 | Oct 2 | Oct 17 |
| 28°F | Oct 1 | Oct 14 | Nov 2 |
| 24°F | Oct 6 | Oct 28 | Nov 18 |
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 | 104 days | 127 days | 148 days |
| 32°F | 132 days | 153 days | 175 days |
| 28°F | 159 days | 183 days | 210 days |
| 24°F | 187 days | 217 days | 245 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 |
|---|---|---|---|
| 99114 | 6a | -10 to -5°F | 18 km |
| 99126 | 6b | -5 to 0°F | 18 km |
| 99167 | 6b | -5 to 0°F | 23 km |
| 99141 | 6b | -5 to 0°F | 24 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 USC00451630, at 48.5678, -117.9356, elevation 474 m (1,554 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 144.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Chewelah (36 km)
- Northport (38 km)
- Republic (60 km)
- Boundary Dam (64 km)
- Deer Park Airport (76 km)
- Newport (78 km)
- Tonasket 11ne (101 km)
- Spokane WFO (101 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.