Frost dates for Weaverville, CA
At Weaverville, the median last spring frost (32°F) is May 3 and the median first fall frost is Oct 11, for a typical growing season of 159 days. For a 90% chance that the last frost has passed, wait until May 27. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- May 3Last spring frost (median)50% chance of 32°F after this date
- May 27Safer planting date10% chance of 32°F after this date
- Oct 11First fall frost (median)50% chance of 32°F by this date
- 159 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 18 |
| 32°F | Apr 16 | May 3 | May 27 |
| 28°F | Mar 20 | Apr 11 | Apr 30 |
| 24°F | Feb 1 | Mar 15 | Apr 12 |
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 11 | Sep 28 | Oct 14 |
| 32°F | Sep 28 | Oct 11 | Nov 1 |
| 28°F | Oct 8 | Oct 29 | Nov 23 |
| 24°F | Oct 20 | Nov 18 | Dec 22 |
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 | 95 days | 119 days | 146 days |
| 32°F | 131 days | 159 days | 188 days |
| 28°F | 168 days | 198 days | 232 days |
| 24°F | 204 days | 244 days | 295 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 |
|---|---|---|---|
| 96093 | 8b | 15 to 20°F | 3 km |
| 96048 | 8b | 15 to 20°F | 13 km |
| 96076 | 9a | 20 to 25°F | 38 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 USC00049490, at 40.7367, -122.9403, elevation 627 m (2,058 ft).
- Data quality: Representative (10+ years), 29 years of freeze data.
- Average days per year at or below 32°F: 106.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Trinity River Hatchery (12 km)
- Big Bar 4 E (23 km)
- Redding 12 WNW (30 km)
- Whiskeytown Rsvr (37 km)
- Shasta Dam (44 km)
- Cecilville (48 km)
- Redding Muni Airport (59 km)
- Callahan (68 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.