Frost dates for Trona, CA
At Trona, the median last spring frost (32°F) is Feb 15 and the median first fall frost is Nov 28, for a typical growing season of 285 days. For a 90% chance that the last frost has passed, wait until Mar 4. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 15Last spring frost (median)50% chance of 32°F after this date
- Mar 4Safer planting date10% chance of 32°F after this date
- Nov 28First fall frost (median)50% chance of 32°F by this date
- 285 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 | Feb 12 | Mar 4 | Apr 4 |
| 32°F | Jan 21 | Feb 15 | Mar 4 |
| 28°F | Dec 29 | Jan 23 | Feb 19 |
| 24°F | Dec 13 | Jan 7 | Feb 7 |
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 | Nov 3 | Nov 17 | Dec 2 |
| 32°F | Nov 11 | Nov 28 | Dec 16 |
| 28°F | Nov 18 | Dec 10 | Jan 2 |
| 24°F | Nov 25 | Dec 23 | Jan 23 |
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 | 226 days | 257 days | 283 days |
| 32°F | 259 days | 285 days | 315 days |
| 28°F | 288 days | 321 days | 350 days |
| 24°F | 314 days | 352 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 97% |
| 24°F | 71% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 93562 | 9a | 20 to 25°F | 10 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 USC00049035, at 35.7636, -117.3908, elevation 517 m (1,695 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 26.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- China Lake Naf (29 km)
- Inyokern (41 km)
- Randsburg (50 km)
- Haiwee (66 km)
- S Lake Fs (89 km)
- Death Valley National Park (91 km)
- Kern River Ph 3 (95 km)
- Stovepipe Wells 1 SW (96 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.