Frost dates for Adin Ranger Station, CA
At Adin Ranger Station, the median last spring frost (32°F) is May 28 and the median first fall frost is Sep 29, for a typical growing season of 125 days. For a 90% chance that the last frost has passed, wait until Jun 16. Nearby ZIP codes are in USDA hardiness zone 7a.
- May 28Last spring frost (median)50% chance of 32°F after this date
- Jun 16Safer planting date10% chance of 32°F after this date
- Sep 29First fall frost (median)50% chance of 32°F by this date
- 125 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 28 | Jun 13 | Jun 29 |
| 32°F | May 7 | May 28 | Jun 16 |
| 28°F | Apr 16 | May 2 | May 29 |
| 24°F | Mar 23 | Apr 13 | May 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 | Aug 26 | Sep 15 | Oct 1 |
| 32°F | Sep 10 | Sep 29 | Oct 15 |
| 28°F | Sep 27 | Oct 13 | Nov 2 |
| 24°F | Oct 9 | Oct 30 | Nov 16 |
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 | 67 days | 91 days | 115 days |
| 32°F | 99 days | 125 days | 152 days |
| 28°F | 132 days | 162 days | 188 days |
| 24°F | 173 days | 200 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 |
|---|---|---|---|
| 96006 | 7a | 0 to 5°F | 11 km |
| 96054 | 7a | 0 to 5°F | 16 km |
| 96009 | 7a | 0 to 5°F | 17 km |
| 96068 | 7a | 0 to 5°F | 24 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 USC00040029, at 41.1936, -120.9447, elevation 1279 m (4,195 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 152.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Canby 3 SW (26 km)
- Alturas Muni Airport (46 km)
- Alturas (47 km)
- Jess Valley (55 km)
- Hat Creek (58 km)
- Burney (69 km)
- Lava Beds Nat Mon (73 km)
- Cedarville (74 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.