Frost dates for Tracy Pumping Plant, CA
At Tracy Pumping Plant, the median last spring frost (32°F) is Jan 19 and the median first fall frost is Dec 10, for a typical growing season of 330 days. For a 90% chance that the last frost has passed, wait until Feb 17. Nearby ZIP codes are in USDA hardiness zone 9b.
- Jan 19Last spring frost (median)50% chance of 32°F after this date
- Feb 17Safer planting date10% chance of 32°F after this date
- Dec 10First fall frost (median)50% chance of 32°F by this date
- 330 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 22 | Feb 21 | Mar 24 |
| 32°F | Dec 25 | Jan 19 | Feb 17 |
| 28°F | Dec 12 | Jan 1 | Jan 22 |
| 24°F | Dec 13 | Dec 31 | Jan 11 |
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 13 | Nov 29 | Dec 13 |
| 32°F | Nov 26 | Dec 10 | Jan 7 |
| 28°F | Dec 4 | Dec 22 | Jan 10 |
| 24°F | Dec 10 | Dec 30 | Jan 9 |
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 | 247 days | 283 days | 313 days |
| 32°F | 297 days | 330 days | 358 days |
| 28°F | 336 days | 361 days | 365 days |
| 24°F | 361 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 94% |
| 28°F | 58% |
| 24°F | 14% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95391 | 9b | 25 to 30°F | 2 km |
| 94514 | 9b | 25 to 30°F | 6 km |
| 94505 | 9b | 25 to 30°F | 8 km |
| 95377 | 9b | 25 to 30°F | 15 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 USC00049001, at 37.7958, -121.5831, elevation 19 m (61 ft).
- Data quality: Standard (24+ years of data), 25 years of freeze data.
- Average days per year at or below 32°F: 10.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Livermore (23 km)
- Livermore Muni Airport (23 km)
- Tracy Carbona (24 km)
- Antioch Pumping Plant #3 (26 km)
- Mount Diablo Junction (32 km)
- Stockton Fire Station 4 (32 km)
- Stockton Metro Airport (33 km)
- Lodi (43 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.