Frost dates for Watsonville Wtr Wks, CA
At Watsonville Wtr Wks, the median last spring frost (32°F) is Jan 28 and the median first fall frost is Dec 13, for a typical growing season of 324 days. For a 90% chance that the last frost has passed, wait until Mar 3. Nearby ZIP codes are in USDA hardiness zones 9b to 10a.
- Jan 28Last spring frost (median)50% chance of 32°F after this date
- Mar 3Safer planting date10% chance of 32°F after this date
- Dec 13First fall frost (median)50% chance of 32°F by this date
- 324 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 | Feb 4 | Mar 15 | Apr 14 |
| 32°F | Dec 23 | Jan 28 | Mar 3 |
| 28°F | Dec 13 | Jan 2 | Jan 30 |
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 8 | Nov 26 | Dec 12 |
| 32°F | Nov 25 | Dec 13 | Jan 15 |
| 28°F | Dec 4 | Dec 26 | Jan 17 |
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 | 218 days | 252 days | 297 days |
| 32°F | 278 days | 324 days | 362 days |
| 28°F | 339 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 | 91% |
| 28°F | 38% |
| 24°F | 2% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95076 | 9b | 25 to 30°F | 2 km |
| 95039 | 10a | 30 to 35°F | 11 km |
| 95004 | 9b | 25 to 30°F | 14 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 USC00049473, at 36.9308, -121.7692, elevation 29 m (95 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 8.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Watsonville Muni Airport (2 km)
- Gilroy (20 km)
- Santa Cruz (21 km)
- Salinas #2 (32 km)
- Hollister 2 (32 km)
- Ben Lomond #4 (33 km)
- Salinas Municipal Airport (33 km)
- Los Gatos (37 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.