Frost dates for Cougar 6 E, WA
At Cougar 6 E, the median last spring frost (32°F) is Apr 1 and the median first fall frost is Nov 18, for a typical growing season of 227 days. For a 90% chance that the last frost has passed, wait until May 2. Nearby ZIP codes are in USDA hardiness zones 8a to 8b.
- Apr 1Last spring frost (median)50% chance of 32°F after this date
- May 2Safer planting date10% chance of 32°F after this date
- Nov 18First fall frost (median)50% chance of 32°F by this date
- 227 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 13 | May 2 | May 24 |
| 32°F | Mar 6 | Apr 1 | May 2 |
| 28°F | Jan 9 | Feb 22 | Mar 21 |
| 24°F | Dec 7 | Jan 17 | Feb 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 | Oct 9 | Oct 29 | Nov 18 |
| 32°F | Oct 29 | Nov 18 | Dec 8 |
| 28°F | Nov 12 | Dec 7 | Jan 10 |
| 24°F | Nov 22 | Dec 22 | Feb 13 |
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 | 147 days | 177 days | 207 days |
| 32°F | 191 days | 227 days | 263 days |
| 28°F | 245 days | 286 days | 331 days |
| 24°F | 295 days | 340 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 99% |
| 24°F | 76% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98616 | 8a | 10 to 15°F | 2 km |
| 98603 | 8b | 15 to 20°F | 16 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 USC00451760, at 46.0625, -122.2044, elevation 201 m (659 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 35.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Carson Fish Hatchery (28 km)
- Battle Ground (41 km)
- Skamania Fish Hatchery (49 km)
- Glenoma (51 km)
- Mount Adams Ranger Station (52 km)
- Vancouver 4 NNE (55 km)
- Longview (56 km)
- Mayfield Power Plant (58 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.