Frost dates for Cushman Powerhouse #2, WA
At Cushman Powerhouse #2, the median last spring frost (32°F) is Mar 24 and the median first fall frost is Nov 15, for a typical growing season of 235 days. For a 90% chance that the last frost has passed, wait until Apr 17. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 24Last spring frost (median)50% chance of 32°F after this date
- Apr 17Safer planting date10% chance of 32°F after this date
- Nov 15First fall frost (median)50% chance of 32°F by this date
- 235 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 2 | Apr 22 | May 8 |
| 32°F | Feb 26 | Mar 24 | Apr 17 |
| 28°F | Jan 4 | Feb 20 | Mar 17 |
| 24°F | Dec 5 | Jan 11 | Feb 21 |
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 11 | Oct 28 | Nov 15 |
| 32°F | Oct 25 | Nov 15 | Dec 8 |
| 28°F | Nov 9 | Dec 7 | Jan 13 |
| 24°F | Nov 26 | Dec 22 | Feb 12 |
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 | 164 days | 187 days | 212 days |
| 32°F | 207 days | 235 days | 269 days |
| 28°F | 255 days | 294 days | 340 days |
| 24°F | 311 days | 353 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 98% |
| 24°F | 66% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98592 | 8b | 15 to 20°F | 8 km |
| 98588 | 8b | 15 to 20°F | 13 km |
| 98548 | 8b | 15 to 20°F | 19 km |
| 98546 | 8b | 15 to 20°F | 19 km |
| 98555 | 8b | 15 to 20°F | 20 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 USC00451939, at 47.3706, -123.1600, elevation 6 m (21 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 46.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Shelton Sanderson Field (15 km)
- Matlock 8 S (31 km)
- Bremerton (42 km)
- Aberdeen 20nne (44 km)
- Elma (44 km)
- Tacoma Narrows Airport (45 km)
- Olympia Airport (48 km)
- Quinault 4 NE (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.