Frost dates for Chino Airport, CA
At Chino Airport, the median last spring frost (32°F) is Jan 17 and the median first fall frost is Dec 19, for a typical growing season of 335 days. For a 90% chance that the last frost has passed, wait until Feb 22. Nearby ZIP codes are in USDA hardiness zones 9b to 10a.
- Jan 17Last spring frost (median)50% chance of 32°F after this date
- Feb 22Safer planting date10% chance of 32°F after this date
- Dec 19First fall frost (median)50% chance of 32°F by this date
- 335 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 | Jan 21 | Feb 24 | Mar 29 |
| 32°F | Dec 18 | Jan 17 | Feb 22 |
| 28°F | Dec 11 | Jan 3 | 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 | Nov 12 | Dec 1 | Dec 18 |
| 32°F | Nov 27 | Dec 19 | Jan 17 |
| 28°F | Dec 7 | Dec 30 | Jan 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 | 241 days | 278 days | 316 days |
| 32°F | 293 days | 335 days | 365 days |
| 28°F | 346 days | 365 days | 365 days |
| 24°F | 365 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 85% |
| 28°F | 29% |
| 24°F | 2% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 91708 | 9b | 25 to 30°F | 3 km |
| 91710 | 10a | 30 to 35°F | 5 km |
| 92880 | 10a | 30 to 35°F | 6 km |
| 91709 | 10a | 30 to 35°F | 9 km |
| 92860 | 10a | 30 to 35°F | 10 km |
| 92882 | 10a | 30 to 35°F | 13 km |
| 92881 | 10a | 30 to 35°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 USW00003179, at 33.9753, -117.6361, elevation 198 m (650 ft).
- Data quality: Representative (10+ years), 18 years of freeze data.
- Average days per year at or below 32°F: 11.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ontario Intl Airport (10 km)
- Pomona/fairplex (17 km)
- Riverside Muni Airport (18 km)
- Anaheim (23 km)
- Riverside Fire Station 3 (23 km)
- Riverside Citrus Exp. (25 km)
- Irvine Rch (30 km)
- Tustin Irvine Rch (32 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.