Frost dates for Auburn, CA
At Auburn, the median last spring frost (32°F) is Feb 25 and the median first fall frost is Dec 5, for a typical growing season of 286 days. For a 90% chance that the last frost has passed, wait until Apr 7. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Feb 25Last spring frost (median)50% chance of 32°F after this date
- Apr 7Safer planting date10% chance of 32°F after this date
- Dec 5First fall frost (median)50% chance of 32°F by this date
- 286 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 2 | Apr 5 | Apr 30 |
| 32°F | Jan 15 | Feb 25 | Apr 7 |
| 28°F | Dec 19 | Jan 13 | Feb 25 |
| 24°F | Dec 9 | Dec 31 | Jan 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 30 | Nov 19 | Dec 7 |
| 32°F | Nov 15 | Dec 5 | Dec 31 |
| 28°F | Dec 1 | Dec 22 | Jan 22 |
| 24°F | Dec 6 | Dec 28 | Jan 14 |
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 | 195 days | 227 days | 261 days |
| 32°F | 236 days | 286 days | 330 days |
| 28°F | 302 days | 344 days | 365 days |
| 24°F | 343 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 99% |
| 28°F | 80% |
| 24°F | 30% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95603 | 9b | 25 to 30°F | 0 km |
| 95658 | 9b | 25 to 30°F | 8 km |
| 95614 | 9b | 25 to 30°F | 9 km |
| 95602 | 9b | 25 to 30°F | 10 km |
| 95663 | 9b | 25 to 30°F | 10 km |
| 95664 | 9b | 25 to 30°F | 12 km |
| 95650 | 9b | 25 to 30°F | 13 km |
| 95651 | 9b | 25 to 30°F | 16 km |
| 95677 | 9b | 25 to 30°F | 18 km |
| 95746 | 9b | 25 to 30°F | 19 km |
| 95765 | 9b | 25 to 30°F | 19 km |
| 95648 | 9a | 20 to 25°F | 20 km |
| 95661 | 9b | 25 to 30°F | 23 km |
| 95678 | 9b | 25 to 30°F | 24 km |
| 95671 | 9b | 25 to 30°F | 24 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 USC00040383, at 38.9072, -121.0839, elevation 394 m (1,292 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 20.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Colfax (24 km)
- Georgetown Ranger Station (25 km)
- Placerville (33 km)
- Grass Valley #2 (33 km)
- Nevada City (38 km)
- Marysville Yuba Co Airport (47 km)
- Sacramento 5 ESE (49 km)
- Sacramento Metro Airport (50 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.