Frost dates for Jess Valley, CA
At Jess Valley, the median last spring frost (32°F) is Jun 14 and the median first fall frost is Sep 18, for a typical growing season of 94 days. For a 90% chance that the last frost has passed, wait until Jul 3. Nearby ZIP codes are in USDA hardiness zones 6a to 7a.
- Jun 14Last spring frost (median)50% chance of 32°F after this date
- Jul 3Safer planting date10% chance of 32°F after this date
- Sep 18First fall frost (median)50% chance of 32°F by this date
- 94 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 |
|---|---|---|---|
| 32°F | May 26 | Jun 14 | Jul 3 |
| 28°F | May 5 | May 30 | Jun 24 |
| 24°F | Apr 16 | May 4 | Jun 5 |
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 | Aug 31 | Sep 18 | Oct 3 |
| 28°F | Sep 14 | Oct 1 | Oct 17 |
| 24°F | Sep 28 | Oct 15 | Nov 2 |
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 | 40 days | 68 days | 91 days |
| 32°F | 65 days | 94 days | 118 days |
| 28°F | 91 days | 124 days | 154 days |
| 24°F | 121 days | 162 days | 190 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 |
|---|---|---|---|
| 96116 | 6b | -5 to 0°F | 13 km |
| 96110 | 6b | -5 to 0°F | 15 km |
| 96119 | 6b | -5 to 0°F | 33 km |
| 96132 | 6a | -10 to -5°F | 45 km |
| 96123 | 6b | -5 to 0°F | 47 km |
| 89412 | 7a | 0 to 5°F | 52 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 USC00044374, at 41.2683, -120.2947, elevation 1646 m (5,400 ft).
- Data quality: Representative (10+ years), 19 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
- Cedarville (31 km)
- Alturas (32 km)
- Alturas Muni Airport (33 km)
- Canby 3 SW (53 km)
- Adin Ranger Station (55 km)
- Fort Bidwell (68 km)
- Susanville 2sw (100 km)
- Hat Creek (111 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.