Frost dates for Valley Center 1n, CA
At Valley Center 1n, the median last spring frost (32°F) is Feb 19 and the median first fall frost is Dec 1, for a typical growing season of 281 days. For a 90% chance that the last frost has passed, wait until Mar 31. Nearby ZIP codes are in USDA hardiness zones 9b to 10a.
- Feb 19Last spring frost (median)50% chance of 32°F after this date
- Mar 31Safer planting date10% chance of 32°F after this date
- Dec 1First fall frost (median)50% chance of 32°F by this date
- 281 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 | Mar 1 | Apr 2 | Apr 22 |
| 32°F | Jan 10 | Feb 19 | Mar 31 |
| 28°F | Dec 13 | Jan 8 | Feb 14 |
| 24°F | Dec 10 | Dec 30 | Jan 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 | Oct 22 | Nov 13 | Dec 1 |
| 32°F | Nov 11 | Dec 1 | Dec 20 |
| 28°F | Nov 28 | Dec 17 | Jan 12 |
| 24°F | Dec 9 | Dec 26 | Jan 21 |
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 | 197 days | 225 days | 256 days |
| 32°F | 240 days | 281 days | 321 days |
| 28°F | 303 days | 340 days | 365 days |
| 24°F | 347 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 85% |
| 24°F | 26% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 92082 | 9b | 25 to 30°F | 5 km |
| 92026 | 10a | 30 to 35°F | 8 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 USC00049226, at 33.2217, -117.0381, elevation 393 m (1,290 ft).
- Data quality: Estimated from nearby stations (2+ years), 4 years of freeze data.
- Average days per year at or below 32°F: 19.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Escondido #2 (12 km)
- San Pasqual Animal Pk (15 km)
- Vista (18 km)
- Rancho Bernardo (23 km)
- Ramona Airport (23 km)
- Carlsbad Palomar Airport (25 km)
- Palomar Mountain Obsy (25 km)
- Henshaw Dam (26 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.