Frost dates for Lebanon, OR
At Lebanon, the median last spring frost (32°F) is Mar 14 and the median first fall frost is Nov 18, for a typical growing season of 248 days. For a 90% chance that the last frost has passed, wait until Apr 14. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 14Last spring frost (median)50% chance of 32°F after this date
- Apr 14Safer planting date10% chance of 32°F after this date
- Nov 18First fall frost (median)50% chance of 32°F by this date
- 248 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 | Mar 25 | Apr 15 | May 4 |
| 32°F | Feb 18 | Mar 14 | Apr 14 |
| 28°F | Dec 26 | Feb 15 | Mar 8 |
| 24°F | Dec 5 | Jan 6 | Feb 20 |
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 8 | Oct 28 | Nov 20 |
| 32°F | Oct 27 | Nov 18 | Dec 15 |
| 28°F | Nov 8 | Dec 10 | Jan 16 |
| 24°F | Nov 22 | Dec 21 | Feb 8 |
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 | 168 days | 195 days | 226 days |
| 32°F | 210 days | 248 days | 286 days |
| 28°F | 260 days | 302 days | 345 days |
| 24°F | 308 days | 348 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 96% |
| 24°F | 66% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97355 | 8b | 15 to 20°F | 6 km |
| 97335 | 8b | 15 to 20°F | 12 km |
| 97377 | 8b | 15 to 20°F | 18 km |
| 97327 | 8b | 15 to 20°F | 18 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 USC00354819, at 44.5328, -122.9014, elevation 101 m (330 ft).
- Data quality: Representative (10+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 38.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Lacomb 3 NNE (18 km)
- Foster Dam (22 km)
- Corvallis State Univ (25 km)
- Stayton (29 km)
- Corvallis 10 SSW (36 km)
- Cascadia (37 km)
- Salem McNary Field (42 km)
- Silver Creek Falls (43 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.