Frost dates for Ramona Fire Dept, CA
At Ramona Fire Dept, the median last spring frost (32°F) is Mar 4 and the median first fall frost is Dec 4, for a typical growing season of 270 days. For a 90% chance that the last frost has passed, wait until Apr 10. Nearby ZIP codes are in USDA hardiness zone 9b.
- Mar 4Last spring frost (median)50% chance of 32°F after this date
- Apr 10Safer planting date10% chance of 32°F after this date
- Dec 4First fall frost (median)50% chance of 32°F by this date
- 270 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 17 | Apr 10 | Apr 28 |
| 32°F | Jan 29 | Mar 4 | Apr 10 |
| 28°F | Dec 23 | Jan 31 | Mar 1 |
| 24°F | Dec 16 | Jan 11 | Feb 19 |
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 26 | Nov 19 | Dec 4 |
| 32°F | Nov 17 | Dec 4 | Dec 18 |
| 28°F | Dec 1 | Dec 19 | Jan 16 |
| 24°F | Dec 12 | Jan 3 | Feb 13 |
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 | 193 days | 221 days | 247 days |
| 32°F | 234 days | 270 days | 308 days |
| 28°F | 286 days | 327 days | 361 days |
| 24°F | 332 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 92% |
| 24°F | 38% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 92065 | 9b | 25 to 30°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 USC00047228, at 33.0114, -116.9081, elevation 448 m (1,470 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 28.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ramona Airport (3 km)
- San Pasqual Animal Pk (13 km)
- Rancho Bernardo (16 km)
- El Capitan Dam (16 km)
- Escondido #2 (21 km)
- Alpine (23 km)
- El Cajon (24 km)
- Valley Center 1n (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.