Frost dates for Corvallis 10 SSW, OR
At Corvallis 10 SSW, the median last spring frost (32°F) is Apr 11 and the median first fall frost is Oct 30, for a typical growing season of 203 days. For a 90% chance that the last frost has passed, wait until May 5. Nearby ZIP codes are in USDA hardiness zone 8b.
- Apr 11Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 30First fall frost (median)50% chance of 32°F by this date
- 203 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 23 | May 11 | May 30 |
| 32°F | Mar 11 | Apr 11 | May 5 |
| 28°F | Jan 27 | Feb 28 | Mar 30 |
| 24°F | Dec 14 | 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 | Sep 28 | Oct 11 | Nov 1 |
| 32°F | Oct 8 | Oct 30 | Nov 25 |
| 28°F | Oct 27 | Nov 20 | Dec 22 |
| 24°F | Nov 11 | Dec 11 | Jan 27 |
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 | 129 days | 154 days | 181 days |
| 32°F | 172 days | 203 days | 241 days |
| 28°F | 227 days | 262 days | 311 days |
| 24°F | 274 days | 318 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 | 90% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97333 | 8b | 15 to 20°F | 6 km |
| 97456 | 8b | 15 to 20°F | 9 km |
| 97348 | 8b | 15 to 20°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 USW00004236, at 44.4186, -123.3258, elevation 95 m (312 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 60.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Corvallis Water Bureau (14 km)
- Corvallis State Univ (26 km)
- Eugene Mahlon Sweet Airport (33 km)
- Alsea Fh (fall Creek) (34 km)
- Lebanon (36 km)
- Fern Ridge-Veneta (41 km)
- Falls City 2 SSW (47 km)
- Foster Dam (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.