Frost dates for Redding 12 WNW, CA
At Redding 12 WNW, the median last spring frost (32°F) is Mar 19 and the median first fall frost is Nov 22, for a typical growing season of 250 days. For a 90% chance that the last frost has passed, wait until Apr 11. Nearby ZIP codes are in USDA hardiness zone 9a.
- Mar 19Last spring frost (median)50% chance of 32°F after this date
- Apr 11Safer planting date10% chance of 32°F after this date
- Nov 22First fall frost (median)50% chance of 32°F by this date
- 250 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 20 | Apr 10 | May 1 |
| 32°F | Feb 17 | Mar 19 | Apr 11 |
| 28°F | Dec 31 | Feb 10 | Mar 20 |
| 24°F | Dec 10 | Jan 4 | Feb 11 |
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 23 | Nov 7 | Nov 25 |
| 32°F | Nov 4 | Nov 22 | Dec 13 |
| 28°F | Nov 16 | Dec 11 | Jan 10 |
| 24°F | Nov 30 | Dec 26 | Jan 29 |
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 | 184 days | 210 days | 237 days |
| 32°F | 219 days | 250 days | 285 days |
| 28°F | 258 days | 300 days | 346 days |
| 24°F | 307 days | 355 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 97% |
| 24°F | 62% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 96087 | 9a | 20 to 25°F | 3 km |
| 96033 | 9a | 20 to 25°F | 10 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 USW00004222, at 40.6508, -122.6067, elevation 432 m (1,418 ft).
- Data quality: Representative (10+ years), 18 years of freeze data.
- Average days per year at or below 32°F: 29.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Whiskeytown Rsvr (8 km)
- Shasta Dam (18 km)
- Trinity River Hatchery (18 km)
- Weaverville (30 km)
- Redding Muni Airport (30 km)
- Big Bar 4 E (52 km)
- Red Bluff Muni Airport (63 km)
- Dunsmuir Trtmt Pl (65 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.