Frost dates for Shasta Dam, CA
At Shasta Dam, the median last spring frost (32°F) is Feb 8 and the median first fall frost is Dec 28, for a typical growing season of 322 days. For a 90% chance that the last frost has passed, wait until Mar 28. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Feb 8Last spring frost (median)50% chance of 32°F after this date
- Mar 28Safer planting date10% chance of 32°F after this date
- Dec 28First fall frost (median)50% chance of 32°F by this date
- 322 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 6 | Mar 19 | Apr 16 |
| 32°F | Dec 26 | Feb 8 | Mar 28 |
| 28°F | Dec 14 | Jan 18 | Mar 14 |
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 | Nov 16 | Dec 6 | Dec 30 |
| 32°F | Dec 1 | Dec 28 | Feb 18 |
| 28°F | Dec 10 | Jan 4 | Mar 10 |
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 | 231 days | 263 days | 313 days |
| 32°F | 268 days | 322 days | 365 days |
| 28°F | 321 days | 365 days | 365 days |
| 24°F | 365 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 86% |
| 28°F | 27% |
| 24°F | 3% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 96019 | 9b | 25 to 30°F | 3 km |
| 96003 | 9b | 25 to 30°F | 10 km |
| 96051 | 9a | 20 to 25°F | 24 km |
| 96008 | 9b | 25 to 30°F | 26 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 USC00048135, at 40.7142, -122.4161, elevation 328 m (1,075 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 6.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Whiskeytown Rsvr (15 km)
- Redding 12 WNW (18 km)
- Redding Muni Airport (24 km)
- Trinity River Hatchery (32 km)
- Weaverville (44 km)
- Dunsmuir Trtmt Pl (53 km)
- Red Bluff Muni Airport (64 km)
- McCloud (64 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.