Frost dates for Nature Park-Beaverton, OR
At Nature Park-Beaverton, the median last spring frost (32°F) is Feb 11 and the median first fall frost is Dec 5, for a typical growing season of 303 days. For a 90% chance that the last frost has passed, wait until Mar 5. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Feb 11Last spring frost (median)50% chance of 32°F after this date
- Mar 5Safer planting date10% chance of 32°F after this date
- Dec 5First fall frost (median)50% chance of 32°F by this date
- 303 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 | Feb 25 | Mar 23 | Apr 15 |
| 32°F | Dec 26 | Feb 11 | Mar 5 |
| 28°F | Dec 2 | Jan 6 | Feb 16 |
| 24°F | Dec 4 | Jan 1 | Feb 11 |
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 26 | Nov 13 | Dec 4 |
| 32°F | Nov 11 | Dec 5 | Jan 12 |
| 28°F | Nov 24 | Dec 21 | Feb 5 |
| 24°F | Dec 2 | Dec 30 | Feb 5 |
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 | 206 days | 235 days | 268 days |
| 32°F | 264 days | 303 days | 344 days |
| 28°F | 312 days | 357 days | 365 days |
| 24°F | 342 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 97% |
| 28°F | 56% |
| 24°F | 15% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97003 | 9a | 20 to 25°F | 2 km |
| 97005 | 9a | 20 to 25°F | 3 km |
| 97006 | 8b | 15 to 20°F | 3 km |
| 97078 | 8b | 15 to 20°F | 5 km |
| 97225 | 8b | 15 to 20°F | 5 km |
| 97229 | 8b | 15 to 20°F | 6 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 USC00355945, at 45.4981, -122.8394, elevation 56 m (185 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 10.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Beaverton 2 SSW (5 km)
- Portland-Hillsboro Airport (10 km)
- Portland Kgw-Tv (12 km)
- Forest Grove (21 km)
- Portland Intl Airport (21 km)
- Rex 1 S (22 km)
- Oregon City (24 km)
- Portland WFO (24 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.