Frost dates for Red Bluff Muni Airport, CA
At Red Bluff Muni Airport, the median last spring frost (32°F) is Feb 22 and the median first fall frost is Nov 29, for a typical growing season of 281 days. For a 90% chance that the last frost has passed, wait until Mar 30. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Feb 22Last spring frost (median)50% chance of 32°F after this date
- Mar 30Safer planting date10% chance of 32°F after this date
- Nov 29First fall frost (median)50% chance of 32°F by this date
- 281 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 1 | Mar 30 | Apr 19 |
| 32°F | Jan 17 | Feb 22 | Mar 30 |
| 28°F | Dec 18 | Jan 13 | Feb 21 |
| 24°F | Dec 11 | Dec 31 | Jan 25 |
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 1 | Nov 15 | Nov 30 |
| 32°F | Nov 12 | Nov 29 | Dec 18 |
| 28°F | Nov 28 | Dec 15 | Jan 12 |
| 24°F | Dec 5 | Dec 25 | Jan 19 |
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 | 205 days | 231 days | 261 days |
| 32°F | 242 days | 281 days | 321 days |
| 28°F | 301 days | 336 days | 365 days |
| 24°F | 342 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 86% |
| 24°F | 34% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 96078 | 9a | 20 to 25°F | 10 km |
| 96035 | 9a | 20 to 25°F | 14 km |
| 96080 | 9b | 25 to 30°F | 16 km |
| 96090 | 9a | 20 to 25°F | 20 km |
| 96055 | 9b | 25 to 30°F | 22 km |
| 96029 | 9b | 25 to 30°F | 31 km |
| 96092 | 9b | 25 to 30°F | 31 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 USW00024216, at 40.1519, -122.2536, elevation 108 m (353 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 19.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Redding Muni Airport (41 km)
- Orland (45 km)
- Whiskeytown Rsvr (56 km)
- Mineral (59 km)
- De Sabla (63 km)
- Redding 12 WNW (63 km)
- Chico Univ Farm (63 km)
- Shasta Dam (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.