Frost dates for Georgetown Ranger Station, CA
At Georgetown Ranger Station, the median last spring frost (32°F) is Apr 12 and the median first fall frost is Nov 21, for a typical growing season of 221 days. For a 90% chance that the last frost has passed, wait until May 10. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Apr 12Last spring frost (median)50% chance of 32°F after this date
- May 10Safer planting date10% chance of 32°F after this date
- Nov 21First fall frost (median)50% chance of 32°F by this date
- 221 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 11 | May 1 | May 27 |
| 32°F | Mar 13 | Apr 12 | May 10 |
| 28°F | Jan 31 | Mar 13 | Apr 14 |
| 24°F | Dec 22 | Feb 8 | Mar 19 |
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 9 | Nov 3 | Nov 22 |
| 32°F | Oct 29 | Nov 21 | Dec 9 |
| 28°F | Nov 18 | Dec 8 | Jan 6 |
| 24°F | Dec 1 | Jan 1 | Feb 18 |
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 | 148 days | 183 days | 214 days |
| 32°F | 182 days | 221 days | 255 days |
| 28°F | 229 days | 269 days | 316 days |
| 24°F | 278 days | 326 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 99% |
| 24°F | 80% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95634 | 9a | 20 to 25°F | 9 km |
| 95633 | 9a | 20 to 25°F | 10 km |
| 95635 | 9b | 25 to 30°F | 10 km |
| 95631 | 9a | 20 to 25°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 USC00043384, at 38.9331, -120.8008, elevation 915 m (3,001 ft).
- Data quality: Representative (10+ years), 22 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
- Colfax (22 km)
- Auburn (25 km)
- Placerville (26 km)
- Pacific House (32 km)
- Grass Valley #2 (38 km)
- Nevada City (39 km)
- Blue Canyon Airport (39 km)
- Lake Spaulding (45 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.