Frost dates for Blue Canyon Airport, CA
At Blue Canyon Airport, the median last spring frost (32°F) is May 4 and the median first fall frost is Nov 4, for a typical growing season of 183 days. For a 90% chance that the last frost has passed, wait until May 31. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- May 4Last spring frost (median)50% chance of 32°F after this date
- May 31Safer planting date10% chance of 32°F after this date
- Nov 4First fall frost (median)50% chance of 32°F by this date
- 183 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 | Apr 27 | May 22 | Jun 10 |
| 32°F | Apr 12 | May 4 | May 31 |
| 28°F | Mar 17 | Apr 16 | May 13 |
| 24°F | Feb 10 | Mar 29 | Apr 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 | Sep 28 | Oct 20 | Nov 10 |
| 32°F | Oct 12 | Nov 4 | Nov 26 |
| 28°F | Nov 1 | Nov 23 | Dec 15 |
| 24°F | Nov 14 | Dec 10 | Jan 15 |
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 | 123 days | 153 days | 183 days |
| 32°F | 150 days | 183 days | 219 days |
| 28°F | 183 days | 219 days | 255 days |
| 24°F | 219 days | 259 days | 310 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 |
|---|---|---|---|
| 95701 | 8b | 15 to 20°F | 7 km |
| 95986 | 8b | 15 to 20°F | 10 km |
| 95714 | 9a | 20 to 25°F | 14 km |
| 95959 | 9a | 20 to 25°F | 16 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 USW00023225, at 39.2775, -120.7103, elevation 1608 m (5,276 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 79.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Lake Spaulding (8 km)
- Bowman Dam (20 km)
- Nevada City (25 km)
- Colfax (29 km)
- Grass Valley #2 (32 km)
- Downieville (33 km)
- Georgetown Ranger Station (39 km)
- Donner Mem State Park (41 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.