Frost dates for Susanville 2sw, CA
At Susanville 2sw, the median last spring frost (32°F) is May 16 and the median first fall frost is Oct 8, for a typical growing season of 143 days. For a 90% chance that the last frost has passed, wait until Jun 5. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- May 16Last spring frost (median)50% chance of 32°F after this date
- Jun 5Safer planting date10% chance of 32°F after this date
- Oct 8First fall frost (median)50% chance of 32°F by this date
- 143 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 18 | Jun 4 | Jun 18 |
| 32°F | Apr 29 | May 16 | Jun 5 |
| 28°F | Apr 7 | Apr 26 | May 17 |
| 24°F | Mar 17 | Apr 6 | Apr 28 |
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 12 | Sep 26 | Oct 8 |
| 32°F | Sep 25 | Oct 8 | Oct 22 |
| 28°F | Oct 5 | Oct 21 | Nov 3 |
| 24°F | Oct 15 | Nov 2 | Nov 17 |
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 | 92 days | 114 days | 135 days |
| 32°F | 118 days | 143 days | 167 days |
| 28°F | 151 days | 176 days | 201 days |
| 24°F | 182 days | 208 days | 234 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 |
|---|---|---|---|
| 96130 | 7a | 0 to 5°F | 15 km |
| 96114 | 7a | 0 to 5°F | 20 km |
| 96128 | 7a | 0 to 5°F | 23 km |
| 96117 | 6b | -5 to 0°F | 38 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 USC00048702, at 40.4167, -120.6631, elevation 1284 m (4,212 ft).
- Data quality: Representative (10+ years), 19 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
- Canyon Dam (45 km)
- Chester (51 km)
- Quincy (59 km)
- Doyle 4 SSE (70 km)
- Portola (70 km)
- Manzanita Lake (79 km)
- Mineral (81 km)
- Adin Ranger Station (90 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.