Frost dates for Packwood, WA
At Packwood, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 8, for a typical growing season of 162 days. For a 90% chance that the last frost has passed, wait until May 17. Nearby ZIP codes are in USDA hardiness zones 7a to 8a.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 17Safer planting date10% chance of 32°F after this date
- Oct 8First fall frost (median)50% chance of 32°F by this date
- 162 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 | May 31 |
| 32°F | Apr 12 | Apr 30 | May 17 |
| 28°F | Mar 15 | Apr 6 | May 1 |
| 24°F | Jan 31 | Mar 2 | 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 4 | Sep 24 | Oct 10 |
| 32°F | Sep 21 | Oct 8 | Oct 31 |
| 28°F | Oct 7 | Oct 29 | Nov 22 |
| 24°F | Oct 26 | Nov 22 | Dec 20 |
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 | 102 days | 128 days | 153 days |
| 32°F | 136 days | 162 days | 189 days |
| 28°F | 173 days | 205 days | 239 days |
| 24°F | 226 days | 262 days | 301 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 |
|---|---|---|---|
| 98361 | 7a | 0 to 5°F | 15 km |
| 98377 | 8a | 10 to 15°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 USC00456262, at 46.6092, -121.6744, elevation 323 m (1,060 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 82.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Longmire Rainier NPS (19 km)
- Rainier Paradise Ranger Station (20 km)
- Glenoma (37 km)
- Mud Mountain Dam (62 km)
- Buckley 1 NE (67 km)
- Mount Adams Ranger Station (69 km)
- Mayfield Power Plant (71 km)
- Cougar 6 E (73 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.