Frost dates for Fort Bidwell, CA
At Fort Bidwell, the median last spring frost (32°F) is May 26 and the median first fall frost is Oct 1, for a typical growing season of 127 days. For a 90% chance that the last frost has passed, wait until Jun 13. Nearby ZIP codes are in USDA hardiness zone 6b.
- May 26Last spring frost (median)50% chance of 32°F after this date
- Jun 13Safer planting date10% chance of 32°F after this date
- Oct 1First fall frost (median)50% chance of 32°F by this date
- 127 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 24 | Jun 11 | Jun 27 |
| 32°F | May 4 | May 26 | Jun 13 |
| 28°F | Apr 16 | May 3 | May 28 |
| 24°F | Mar 20 | Apr 12 | May 1 |
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 | Aug 28 | Sep 15 | Oct 1 |
| 32°F | Sep 12 | Oct 1 | Oct 16 |
| 28°F | Sep 29 | Oct 14 | Nov 1 |
| 24°F | Oct 11 | Oct 29 | Nov 14 |
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 | 72 days | 96 days | 120 days |
| 32°F | 100 days | 127 days | 154 days |
| 28°F | 136 days | 164 days | 188 days |
| 24°F | 172 days | 198 days | 225 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 |
|---|---|---|---|
| 96112 | 6b | -5 to 0°F | 3 km |
| 97635 | 6b | -5 to 0°F | 13 km |
| 96108 | 6b | -5 to 0°F | 22 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 USC00043157, at 41.8714, -120.1575, elevation 1444 m (4,739 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 149.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cedarville (38 km)
- Alturas (53 km)
- Alturas Muni Airport (54 km)
- Jess Valley (68 km)
- Canby 3 SW (80 km)
- Adin Ranger Station (100 km)
- Tulelake (109 km)
- Lava Beds Nat Mon (113 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.