Frost dates for Calaveras Big Trees, CA
At Calaveras Big Trees, the median last spring frost (32°F) is May 7 and the median first fall frost is Oct 28, for a typical growing season of 169 days. For a 90% chance that the last frost has passed, wait until May 31. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- May 7Last spring frost (median)50% chance of 32°F after this date
- May 31Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 169 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 | May 7 | May 30 | Jun 14 |
| 32°F | Apr 18 | May 7 | May 31 |
| 28°F | Mar 28 | Apr 18 | May 12 |
| 24°F | Feb 19 | Mar 27 | Apr 20 |
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 24 | Oct 11 | Nov 1 |
| 32°F | Oct 5 | Oct 28 | Nov 16 |
| 28°F | Oct 23 | Nov 14 | Dec 5 |
| 24°F | Nov 6 | Dec 3 | Dec 23 |
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 | 111 days | 136 days | 165 days |
| 32°F | 139 days | 169 days | 199 days |
| 28°F | 175 days | 207 days | 241 days |
| 24°F | 210 days | 249 days | 289 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95224 | 8b | 15 to 20°F | 5 km |
| 95233 | 8b | 15 to 20°F | 11 km |
| 95248 | 9a | 20 to 25°F | 14 km |
| 95246 | 9a | 20 to 25°F | 16 km |
| 95257 | 8b | 15 to 20°F | 18 km |
| 95255 | 9a | 20 to 25°F | 22 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 USC00041277, at 38.2769, -120.3114, elevation 1431 m (4,695 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 115.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- New Melones Dam HQ (34 km)
- Sonora (35 km)
- Sutter Hill Cdf (44 km)
- Camp Pardee (47 km)
- Cherry Valley Dam (48 km)
- Groveland 2 (49 km)
- Pacific House (56 km)
- Hetch Hetchy (58 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.