Frost dates for Campo, CA
At Campo, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 26, for a typical growing season of 174 days. For a 90% chance that the last frost has passed, wait until Jun 1. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- Jun 1Safer planting date10% chance of 32°F after this date
- Oct 26First fall frost (median)50% chance of 32°F by this date
- 174 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 3 | Jun 3 | Jun 29 |
| 32°F | Apr 9 | Apr 30 | Jun 1 |
| 28°F | Feb 23 | Apr 2 | Apr 28 |
| 24°F | Dec 29 | Feb 13 | Mar 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 | Sep 2 | Oct 2 | Oct 23 |
| 32°F | Sep 30 | Oct 26 | Nov 12 |
| 28°F | Oct 22 | Nov 14 | Dec 5 |
| 24°F | Nov 11 | Dec 5 | Jan 8 |
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 | 80 days | 118 days | 155 days |
| 32°F | 135 days | 174 days | 207 days |
| 28°F | 191 days | 226 days | 271 days |
| 24°F | 249 days | 297 days | 344 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 97% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 91906 | 9a | 20 to 25°F | 4 km |
| 91963 | 9a | 20 to 25°F | 12 km |
| 91980 | 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 USC00041424, at 32.6264, -116.4700, elevation 802 m (2,630 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 71.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Campo Asos (0 km)
- Mount Laguna #3 (27 km)
- Alpine (37 km)
- Cuyamaca (42 km)
- El Capitan Dam (43 km)
- El Cajon (47 km)
- San Diego Brown Field (48 km)
- Julian Cdf (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.