Frost dates for Antioch Pumping Plant #3, CA
At Antioch Pumping Plant #3, the median last spring frost (32°F) is Jan 12 and the median first fall frost is Dec 19, for a typical growing season of 343 days. For a 90% chance that the last frost has passed, wait until Feb 1. Nearby ZIP codes are in USDA hardiness zone 9b.
- Jan 12Last spring frost (median)50% chance of 32°F after this date
- Feb 1Safer planting date10% chance of 32°F after this date
- Dec 19First fall frost (median)50% chance of 32°F by this date
- 343 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 11 | Feb 8 | Mar 12 |
| 32°F | Dec 20 | Jan 12 | Feb 1 |
| 28°F | Dec 16 | Jan 2 | Jan 22 |
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 18 | Dec 4 | Dec 28 |
| 32°F | Nov 29 | Dec 19 | Jan 12 |
| 28°F | Dec 9 | Dec 29 | Jan 16 |
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 | 263 days | 299 days | 331 days |
| 32°F | 315 days | 343 days | 365 days |
| 28°F | 347 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 | 81% |
| 28°F | 35% |
| 24°F | 5% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 94531 | 9b | 25 to 30°F | 4 km |
| 94509 | 9b | 25 to 30°F | 5 km |
| 94561 | 9b | 25 to 30°F | 5 km |
| 94513 | 9b | 25 to 30°F | 9 km |
| 94548 | 9b | 25 to 30°F | 9 km |
| 94511 | 9b | 25 to 30°F | 12 km |
| 94512 | 9b | 25 to 30°F | 18 km |
| 94571 | 9b | 25 to 30°F | 19 km |
| 95641 | 9b | 25 to 30°F | 23 km |
| 95690 | 9b | 25 to 30°F | 27 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 USC00040232, at 37.9833, -121.7525, elevation 18 m (60 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 7.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mount Diablo Junction (19 km)
- Tracy Pumping Plant (26 km)
- Concord Buchanan Field (27 km)
- Concord Wastewater Plant (28 km)
- Martinez Water Plant (32 km)
- Livermore (33 km)
- Livermore Muni Airport (33 km)
- Stockton Fire Station 4 (38 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.