Frost dates for Snowden, WA
At Snowden, the median last spring frost (32°F) is May 12 and the median first fall frost is Oct 11, for a typical growing season of 149 days. For a 90% chance that the last frost has passed, wait until Jun 7. Nearby ZIP codes are in USDA hardiness zones 7a to 8a.
- May 12Last spring frost (median)50% chance of 32°F after this date
- Jun 7Safer planting date10% chance of 32°F after this date
- Oct 11First fall frost (median)50% chance of 32°F by this date
- 149 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 17 | Jun 8 | Jul 2 |
| 32°F | Apr 25 | May 12 | Jun 7 |
| 28°F | Mar 30 | Apr 23 | May 12 |
| 24°F | Feb 25 | Mar 21 | Apr 20 |
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 1 | Sep 25 | Oct 9 |
| 32°F | Sep 24 | Oct 11 | Oct 28 |
| 28°F | Oct 9 | Oct 28 | Nov 16 |
| 24°F | Oct 25 | Nov 13 | Dec 4 |
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 | 73 days | 106 days | 134 days |
| 32°F | 118 days | 149 days | 174 days |
| 28°F | 162 days | 188 days | 218 days |
| 24°F | 203 days | 237 days | 270 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 |
|---|---|---|---|
| 98602 | 7a | 0 to 5°F | 8 km |
| 98672 | 7b | 5 to 10°F | 9 km |
| 98623 | 8a | 10 to 15°F | 11 km |
| 98670 | 7b | 5 to 10°F | 17 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 USC00457794, at 45.8175, -121.3533, elevation 736 m (2,415 ft).
- Data quality: Estimated from nearby stations (2+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 141.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Glenwood #2 (22 km)
- Mount Adams Ranger Station (25 km)
- The Dalles Muni Airport (26 km)
- Goldendale (40 km)
- Carson Fish Hatchery (48 km)
- Satus Pass 2 SSW (55 km)
- Skamania Fish Hatchery (71 km)
- Cougar 6 E (71 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.