Frost dates for Salem McNary Field, OR
At Salem McNary Field, the median last spring frost (32°F) is Apr 3 and the median first fall frost is Nov 1, for a typical growing season of 212 days. For a 90% chance that the last frost has passed, wait until Apr 27. Nearby ZIP codes are in USDA hardiness zone 8b.
- Apr 3Last spring frost (median)50% chance of 32°F after this date
- Apr 27Safer planting date10% chance of 32°F after this date
- Nov 1First fall frost (median)50% chance of 32°F by this date
- 212 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 14 | Apr 30 | May 16 |
| 32°F | Mar 10 | Apr 3 | Apr 27 |
| 28°F | Jan 31 | Mar 2 | Mar 30 |
| 24°F | Dec 18 | Jan 27 | Feb 27 |
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 2 | Oct 18 | Nov 2 |
| 32°F | Oct 16 | Nov 1 | Nov 23 |
| 28°F | Oct 30 | Nov 22 | Dec 17 |
| 24°F | Nov 12 | Dec 10 | Jan 16 |
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 | 149 days | 171 days | 193 days |
| 32°F | 183 days | 212 days | 245 days |
| 28°F | 227 days | 264 days | 304 days |
| 24°F | 274 days | 318 days | 358 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 93% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97310 | 8b | 15 to 20°F | 4 km |
| 97302 | 8b | 15 to 20°F | 5 km |
| 97301 | 8b | 15 to 20°F | 5 km |
| 97317 | 8b | 15 to 20°F | 7 km |
| 97306 | 8b | 15 to 20°F | 10 km |
| 97303 | 8b | 15 to 20°F | 14 km |
| 97351 | 8b | 15 to 20°F | 14 km |
| 97304 | 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 USW00024232, at 44.9050, -123.0011, elevation 62 m (205 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 49.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Stayton (20 km)
- Silverton (21 km)
- Dallas 2 NE (23 km)
- Silver Creek Falls (28 km)
- Corvallis State Univ (34 km)
- McMinnville Muni Airport (34 km)
- Falls City 2 SSW (36 km)
- Mc Minnville (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.