Frost dates for Beaverton 2 SSW, OR
At Beaverton 2 SSW, the median last spring frost (32°F) is Apr 1 and the median first fall frost is Nov 6, for a typical growing season of 222 days. For a 90% chance that the last frost has passed, wait until Apr 26. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Apr 1Last spring frost (median)50% chance of 32°F after this date
- Apr 26Safer planting date10% chance of 32°F after this date
- Nov 6First fall frost (median)50% chance of 32°F by this date
- 222 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 11 | Apr 28 | May 16 |
| 32°F | Mar 5 | Apr 1 | Apr 26 |
| 28°F | Jan 23 | Feb 26 | Mar 26 |
| 24°F | Dec 15 | Feb 1 | 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 4 | Oct 21 | Nov 7 |
| 32°F | Oct 19 | Nov 6 | Dec 1 |
| 28°F | Nov 6 | Nov 30 | Dec 27 |
| 24°F | Nov 18 | Dec 19 | Feb 3 |
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 | 150 days | 174 days | 198 days |
| 32°F | 186 days | 222 days | 254 days |
| 28°F | 239 days | 275 days | 317 days |
| 24°F | 283 days | 326 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 84% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97008 | 9a | 20 to 25°F | 2 km |
| 97223 | 9a | 20 to 25°F | 4 km |
| 97007 | 8b | 15 to 20°F | 4 km |
| 97224 | 9a | 20 to 25°F | 6 km |
| 97035 | 9a | 20 to 25°F | 9 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 USC00350595, at 45.4547, -122.8203, elevation 82 m (270 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 42.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Nature Park-Beaverton (5 km)
- Portland Kgw-Tv (12 km)
- Portland-Hillsboro Airport (14 km)
- Rex 1 S (18 km)
- N Willamette Exp. Station (20 km)
- Oregon City (20 km)
- Portland Intl Airport (23 km)
- Aurora State Airport (23 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.