Frost dates for Dobbins 1 S, CA
At Dobbins 1 S, the median last spring frost (32°F) is Apr 1 and the median first fall frost is Nov 17, for a typical growing season of 229 days. For a 90% chance that the last frost has passed, wait until Apr 22. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Apr 1Last spring frost (median)50% chance of 32°F after this date
- Apr 22Safer planting date10% chance of 32°F after this date
- Nov 17First fall frost (median)50% chance of 32°F by this date
- 229 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 4 | Apr 23 | May 12 |
| 32°F | Mar 4 | Apr 1 | Apr 22 |
| 28°F | Jan 24 | Feb 27 | Mar 27 |
| 24°F | Dec 25 | Feb 1 | Feb 28 |
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 12 | Nov 1 | Nov 16 |
| 32°F | Oct 31 | Nov 17 | Dec 5 |
| 28°F | Nov 14 | Dec 1 | Dec 29 |
| 24°F | Nov 25 | Dec 18 | Jan 24 |
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 | 165 days | 192 days | 217 days |
| 32°F | 199 days | 229 days | 260 days |
| 28°F | 245 days | 281 days | 316 days |
| 24°F | 288 days | 328 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 88% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95935 | 9a | 20 to 25°F | 3 km |
| 95962 | 9b | 25 to 30°F | 7 km |
| 95919 | 9a | 20 to 25°F | 10 km |
| 95918 | 9b | 25 to 30°F | 13 km |
| 95972 | 9b | 25 to 30°F | 14 km |
| 95914 | 9b | 25 to 30°F | 16 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 USC00042456, at 39.3575, -121.2011, elevation 500 m (1,640 ft).
- Data quality: Representative (10+ years), 18 years of freeze data.
- Average days per year at or below 32°F: 58.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Grass Valley #2 (21 km)
- Nevada City (21 km)
- Strawberry Valley (24 km)
- Oroville (35 km)
- Colfax (37 km)
- Oroville Muni Airport (39 km)
- Downieville (40 km)
- Marysville (41 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.