Frost dates for Idyllwild Fire Dept, CA
At Idyllwild Fire Dept, the median last spring frost (32°F) is May 16 and the median first fall frost is Oct 24, for a typical growing season of 160 days. For a 90% chance that the last frost has passed, wait until Jun 5. Nearby ZIP codes are in USDA hardiness zones 8a to 9b.
- 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 24First fall frost (median)50% chance of 32°F by this date
- 160 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 14 | Jun 1 | Jun 19 |
| 32°F | Apr 23 | May 16 | Jun 5 |
| 28°F | Mar 31 | Apr 24 | May 19 |
| 24°F | Mar 1 | Mar 31 | May 3 |
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 17 | Oct 6 | Oct 26 |
| 32°F | Oct 1 | Oct 24 | Nov 11 |
| 28°F | Oct 17 | Nov 10 | Dec 3 |
| 24°F | Nov 9 | Dec 1 | Dec 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 | 101 days | 127 days | 153 days |
| 32°F | 131 days | 160 days | 191 days |
| 28°F | 167 days | 200 days | 234 days |
| 24°F | 207 days | 246 days | 285 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 |
|---|---|---|---|
| 92549 | 8a | 10 to 15°F | 6 km |
| 92230 | 9b | 25 to 30°F | 18 km |
| 92561 | 8b | 15 to 20°F | 18 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 USC00044211, at 33.7572, -116.7067, elevation 1640 m (5,380 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 107.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hemet (17 km)
- Palm Springs (20 km)
- Palm Springs Regional Airport (20 km)
- San Jacinto (25 km)
- Morongo Valley N (39 km)
- Palomar Mountain Obsy (44 km)
- Indio Fire Station (46 km)
- Yucca Valley (51 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.