Frost dates for Corvallis State Univ, OR
At Corvallis State Univ, the median last spring frost (32°F) is Apr 17 and the median first fall frost is Oct 28, for a typical growing season of 194 days. For a 90% chance that the last frost has passed, wait until May 8. Nearby ZIP codes are in USDA hardiness zone 8b.
- Apr 17Last spring frost (median)50% chance of 32°F after this date
- May 8Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 194 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 25 | May 11 | Jun 2 |
| 32°F | Mar 22 | Apr 17 | May 8 |
| 28°F | Jan 25 | Mar 1 | Apr 5 |
| 24°F | Dec 10 | Jan 24 | Feb 24 |
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 23 | Oct 10 | Oct 28 |
| 32°F | Oct 5 | Oct 28 | Nov 19 |
| 28°F | Oct 22 | Nov 17 | Dec 18 |
| 24°F | Nov 7 | Dec 5 | Jan 13 |
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 | 122 days | 151 days | 176 days |
| 32°F | 163 days | 194 days | 227 days |
| 28°F | 216 days | 259 days | 301 days |
| 24°F | 273 days | 318 days | 362 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 91% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97321 | 8b | 15 to 20°F | 5 km |
| 97330 | 8b | 15 to 20°F | 6 km |
| 97331 | 8b | 15 to 20°F | 11 km |
| 97322 | 8b | 15 to 20°F | 14 km |
| 97389 | 8b | 15 to 20°F | 14 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 USC00351862, at 44.6342, -123.1900, elevation 69 m (225 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 54.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Corvallis Water Bureau (25 km)
- Lebanon (25 km)
- Corvallis 10 SSW (26 km)
- Falls City 2 SSW (31 km)
- Salem McNary Field (34 km)
- Stayton (34 km)
- Dallas 2 NE (36 km)
- Lacomb 3 NNE (37 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.