Frost dates for Morongo Valley N, CA
At Morongo Valley N, the median last spring frost (32°F) is Feb 25 and the median first fall frost is Dec 15, for a typical growing season of 297 days. For a 90% chance that the last frost has passed, wait until Apr 3. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Feb 25Last spring frost (median)50% chance of 32°F after this date
- Apr 3Safer planting date10% chance of 32°F after this date
- Dec 15First fall frost (median)50% chance of 32°F by this date
- 297 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 20 | Mar 31 | Apr 29 |
| 32°F | Jan 7 | Feb 25 | Apr 3 |
| 28°F | Dec 20 | Jan 25 | Feb 28 |
| 24°F | Jan 3 | Jan 14 | Jan 31 |
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 7 | Dec 1 | Dec 16 |
| 32°F | Nov 23 | Dec 15 | Jan 16 |
| 28°F | Dec 8 | Jan 6 | Feb 14 |
| 24°F | Jan 2 | Jan 13 | Jan 30 |
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 | 208 days | 244 days | 287 days |
| 32°F | 250 days | 297 days | 343 days |
| 28°F | 306 days | 352 days | 365 days |
| 24°F | 362 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 98% |
| 28°F | 64% |
| 24°F | 14% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 92256 | 9b | 25 to 30°F | 5 km |
| 92268 | 9a | 20 to 25°F | 8 km |
| 92282 | 9b | 25 to 30°F | 16 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 USC00045860, at 34.0864, -116.5622, elevation 959 m (3,145 ft).
- Data quality: Representative (10+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 13.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Yucca Valley (17 km)
- Yucca Mesa (20 km)
- Joshua Tree (27 km)
- Palm Springs (29 km)
- Palm Springs Regional Airport (29 km)
- Johnson Valley (30 km)
- Big Bear Lake (37 km)
- Idyllwild Fire Dept (39 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.