Frost dates for Lake Solano, CA
At Lake Solano, the median last spring frost (32°F) is Feb 4 and the median first fall frost is Dec 5, for a typical growing season of 304 days. For a 90% chance that the last frost has passed, wait until Mar 9. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 4Last spring frost (median)50% chance of 32°F after this date
- Mar 9Safer planting date10% chance of 32°F after this date
- Dec 5First fall frost (median)50% chance of 32°F by this date
- 304 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 7 | Mar 14 | Apr 18 |
| 32°F | Jan 2 | Feb 4 | Mar 9 |
| 28°F | Dec 15 | Jan 8 | Feb 12 |
| 24°F | Dec 9 | Dec 31 | Jan 24 |
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 2 | Nov 21 | Dec 8 |
| 32°F | Nov 18 | Dec 5 | Jan 2 |
| 28°F | Dec 1 | Dec 20 | Jan 21 |
| 24°F | Dec 7 | Dec 27 | Jan 18 |
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 | 210 days | 250 days | 285 days |
| 32°F | 266 days | 304 days | 341 days |
| 28°F | 315 days | 351 days | 365 days |
| 24°F | 350 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 97% |
| 28°F | 69% |
| 24°F | 21% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95688 | 9b | 25 to 30°F | 8 km |
| 95694 | 9b | 25 to 30°F | 10 km |
| 95625 | 9b | 25 to 30°F | 17 km |
| 95687 | 9b | 25 to 30°F | 19 km |
| 95616 | 9b | 25 to 30°F | 19 km |
| 94558 | 9b | 25 to 30°F | 20 km |
| 95653 | 9b | 25 to 30°F | 23 km |
| 94533 | 9b | 25 to 30°F | 23 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 USC00044712, at 38.4919, -122.0039, elevation 57 m (187 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 14.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Winters (4 km)
- Markley Cove (10 km)
- Vacaville (11 km)
- Vacaville Nut Tree Airport (13 km)
- Davis 2 WSW Exp. Farm (20 km)
- Fairfield (25 km)
- Woodland 1 WNW (28 km)
- Napa State Hospital (33 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.