Frost dates for Cottage Grove 2e, OR
At Cottage Grove 2e, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 25, for a typical growing season of 183 days. For a 90% chance that the last frost has passed, wait until May 10. Nearby ZIP codes are in USDA hardiness zone 8b.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 10Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 183 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 26 | May 12 | May 30 |
| 32°F | Mar 31 | Apr 24 | May 10 |
| 28°F | Feb 21 | Mar 23 | Apr 22 |
| 24°F | Dec 29 | Feb 16 | Mar 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 | Sep 7 | Oct 1 | Oct 26 |
| 32°F | Sep 30 | Oct 25 | Nov 16 |
| 28°F | Oct 21 | Nov 18 | Dec 17 |
| 24°F | Nov 6 | Dec 15 | Jan 28 |
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 | 108 days | 140 days | 169 days |
| 32°F | 151 days | 183 days | 216 days |
| 28°F | 200 days | 239 days | 279 days |
| 24°F | 254 days | 307 days | 352 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 95% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97426 | 8b | 15 to 20°F | 12 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 USC00351897, at 43.7917, -123.0275, elevation 181 m (595 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 59.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Dorena (5 km)
- Cottage Grove Dam (9 km)
- Lookout Point Dam (25 km)
- Drain (28 km)
- Fern Ridge-Veneta (40 km)
- Eugene Mahlon Sweet Airport (40 km)
- Leaburg 1 SW (44 km)
- Idleyld Park 4 NE (47 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.