Frost dates for Manzanita Lake, CA
At Manzanita Lake, the median last spring frost (32°F) is Jun 9 and the median first fall frost is Sep 21, for a typical growing season of 102 days. For a 90% chance that the last frost has passed, wait until Jun 27. Nearby ZIP codes are in USDA hardiness zones 7a to 9b.
- Jun 9Last spring frost (median)50% chance of 32°F after this date
- Jun 27Safer planting date10% chance of 32°F after this date
- Sep 21First fall frost (median)50% chance of 32°F by this date
- 102 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 7a (0 to 5°F) · see all zone 7a frost dates
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 |
|---|---|---|---|
| 32°F | May 21 | Jun 9 | Jun 27 |
| 28°F | Apr 30 | May 22 | Jun 10 |
| 24°F | Apr 13 | Apr 29 | May 23 |
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 |
|---|---|---|---|
| 32°F | Sep 1 | Sep 21 | Oct 11 |
| 28°F | Sep 18 | Oct 11 | Oct 31 |
| 24°F | Oct 7 | 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 | 37 days | 64 days | 92 days |
| 32°F | 73 days | 102 days | 127 days |
| 28°F | 112 days | 141 days | 170 days |
| 24°F | 150 days | 181 days | 205 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 |
|---|---|---|---|
| 96071 | 7a | 0 to 5°F | 20 km |
| 96088 | 9b | 25 to 30°F | 26 km |
| 96096 | 9a | 20 to 25°F | 27 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 USC00045311, at 40.5411, -121.5767, elevation 1753 m (5,750 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 195.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mineral (22 km)
- Burney (38 km)
- Chester (39 km)
- Hat Creek (44 km)
- Canyon Dam (58 km)
- Redding Muni Airport (61 km)
- Red Bluff Muni Airport (72 km)
- Shasta Dam (73 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.