Frost dates for Redding Muni Airport, CA
At Redding Muni Airport, the median last spring frost (32°F) is Mar 3 and the median first fall frost is Nov 21, for a typical growing season of 261 days. For a 90% chance that the last frost has passed, wait until Apr 9. Nearby ZIP codes are in USDA hardiness zone 9a.
- Mar 3Last spring frost (median)50% chance of 32°F after this date
- Apr 9Safer planting date10% chance of 32°F after this date
- Nov 21First fall frost (median)50% chance of 32°F by this date
- 261 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 9 | Apr 7 | Apr 26 |
| 32°F | Jan 31 | Mar 3 | Apr 9 |
| 28°F | Dec 20 | Jan 27 | Mar 1 |
| 24°F | Dec 5 | Jan 1 | Feb 2 |
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 28 | Nov 9 | Nov 22 |
| 32°F | Nov 7 | Nov 21 | Dec 7 |
| 28°F | Nov 20 | Dec 7 | Jan 5 |
| 24°F | Nov 30 | Dec 18 | Jan 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 | 191 days | 215 days | 245 days |
| 32°F | 223 days | 261 days | 299 days |
| 28°F | 277 days | 316 days | 356 days |
| 24°F | 329 days | 362 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 94% |
| 24°F | 52% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 96002 | 9a | 20 to 25°F | 2 km |
| 96007 | 9a | 20 to 25°F | 7 km |
| 96073 | 9a | 20 to 25°F | 13 km |
| 96062 | 9a | 20 to 25°F | 18 km |
| 96022 | 9a | 20 to 25°F | 24 km |
| 96069 | 9a | 20 to 25°F | 30 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 USW00024257, at 40.5175, -122.2986, elevation 152 m (497 ft).
- Data quality: Standard (24+ years of data), 25 years of freeze data.
- Average days per year at or below 32°F: 27.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Whiskeytown Rsvr (22 km)
- Shasta Dam (24 km)
- Redding 12 WNW (30 km)
- Red Bluff Muni Airport (41 km)
- Trinity River Hatchery (48 km)
- Weaverville (59 km)
- Manzanita Lake (61 km)
- Mineral (61 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.