Frost dates for Colusa 2 SSW, CA
At Colusa 2 SSW, the median last spring frost (32°F) is Feb 14 and the median first fall frost is Dec 1, for a typical growing season of 293 days. For a 90% chance that the last frost has passed, wait until Mar 31. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 14Last spring frost (median)50% chance of 32°F after this date
- Mar 31Safer planting date10% chance of 32°F after this date
- Dec 1First fall frost (median)50% chance of 32°F by this date
- 293 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 | Feb 21 | Mar 31 | Apr 22 |
| 32°F | Jan 2 | Feb 14 | Mar 31 |
| 28°F | Dec 11 | Jan 8 | Feb 20 |
| 24°F | Dec 5 | Dec 31 | Jan 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 28 | Nov 12 | Nov 30 |
| 32°F | Nov 11 | Dec 1 | Dec 26 |
| 28°F | Nov 24 | Dec 15 | Jan 17 |
| 24°F | Dec 2 | Dec 22 | Jan 22 |
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 | 198 days | 228 days | 269 days |
| 32°F | 240 days | 293 days | 334 days |
| 28°F | 306 days | 342 days | 365 days |
| 24°F | 347 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 98% |
| 28°F | 74% |
| 24°F | 21% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95932 | 9b | 25 to 30°F | 7 km |
| 95950 | 9b | 25 to 30°F | 19 km |
| 95982 | 9b | 25 to 30°F | 19 km |
| 95955 | 9b | 25 to 30°F | 19 km |
| 95987 | 9b | 25 to 30°F | 21 km |
| 95912 | 9b | 25 to 30°F | 21 km |
| 95970 | 9b | 25 to 30°F | 25 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 USC00041948, at 39.1875, -122.0269, elevation 15 m (50 ft).
- Data quality: Standard (24+ years of data), 25 years of freeze data.
- Average days per year at or below 32°F: 17.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Marysville (38 km)
- Marysville Yuba Co Airport (41 km)
- Willows 6 W (44 km)
- East Park Rsvr (46 km)
- Oroville Muni Airport (49 km)
- Oroville (55 km)
- Clearlake 4 SE (55 km)
- Chico Univ Farm (59 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.