Frost dates for Twentynine Palms, CA
At Twentynine Palms, the median last spring frost (32°F) is Jan 24 and the median first fall frost is Dec 10, for a typical growing season of 321 days. For a 90% chance that the last frost has passed, wait until Feb 22. Nearby ZIP codes are in USDA hardiness zone 9b.
- Jan 24Last spring frost (median)50% chance of 32°F after this date
- Feb 22Safer planting date10% chance of 32°F after this date
- Dec 10First fall frost (median)50% chance of 32°F by this date
- 321 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 | Jan 22 | Feb 19 | Mar 11 |
| 32°F | Dec 22 | Jan 24 | Feb 22 |
| 28°F | Dec 11 | Jan 3 | Feb 8 |
| 24°F | Dec 14 | Jan 4 | Feb 6 |
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 13 | Nov 27 | Dec 13 |
| 32°F | Nov 24 | Dec 10 | Jan 1 |
| 28°F | Dec 3 | Dec 23 | Jan 28 |
| 24°F | Dec 12 | Jan 2 | Jan 31 |
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 | 254 days | 280 days | 313 days |
| 32°F | 284 days | 321 days | 354 days |
| 28°F | 324 days | 357 days | 365 days |
| 24°F | 355 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 97% |
| 28°F | 63% |
| 24°F | 16% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 92278 | 9b | 25 to 30°F | 12 km |
| 92277 | 9b | 25 to 30°F | 32 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 USC00049099, at 34.1281, -116.0369, elevation 602 m (1,975 ft).
- Data quality: Representative (10+ years), 26 years of freeze data.
- Average days per year at or below 32°F: 17.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Joshua Tree (22 km)
- Yucca Valley (32 km)
- Yucca Mesa (36 km)
- Morongo Valley N (49 km)
- Indio Fire Station (49 km)
- Johnson Valley (53 km)
- Palm Springs Regional Airport (55 km)
- Palm Springs (55 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.