Frost dates for Skamania Fish Hatchery, WA
At Skamania Fish Hatchery, the median last spring frost (32°F) is Apr 29 and the median first fall frost is Oct 22, for a typical growing season of 177 days. For a 90% chance that the last frost has passed, wait until May 15. Nearby ZIP codes are in USDA hardiness zone 8b.
- Apr 29Last spring frost (median)50% chance of 32°F after this date
- May 15Safer planting date10% chance of 32°F after this date
- Oct 22First fall frost (median)50% chance of 32°F by this date
- 177 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 30 | May 15 | Jun 3 |
| 32°F | Apr 5 | Apr 29 | May 15 |
| 28°F | Feb 24 | Mar 28 | May 2 |
| 24°F | Dec 28 | Feb 20 | Mar 28 |
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 2 | Oct 1 | Oct 20 |
| 32°F | Sep 27 | Oct 22 | Nov 15 |
| 28°F | Oct 18 | Nov 14 | Dec 14 |
| 24°F | Nov 2 | Dec 5 | Jan 10 |
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 | 105 days | 137 days | 165 days |
| 32°F | 148 days | 177 days | 211 days |
| 28°F | 189 days | 232 days | 277 days |
| 24°F | 245 days | 293 days | 344 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 97% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98671 | 8b | 15 to 20°F | 5 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 USC00457696, at 45.6219, -122.2178, elevation 133 m (435 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 81.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Battle Ground (29 km)
- Carson Fish Hatchery (33 km)
- Vancouver Pearson Airport (34 km)
- Vancouver 4 NNE (34 km)
- Cougar 6 E (49 km)
- Mount Adams Ranger Station (67 km)
- Snowden (71 km)
- Longview (80 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.