Last spring frost
Feb 22
Frost Dates for Vina, CA
First fall frost
Nov 29
Growing season
281 days
Hardiness zone
9b
In an average year around Vina, CA, the last spring frost (32°F) is about Feb 22 and the first fall frost is about Nov 29, giving roughly a 281-day growing season. To be safe most years, wait until Jan 17 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Apr 19 | Mar 30 | Mar 1 |
| Freeze (32°F) | Mar 30 | Feb 22 | Jan 17 |
| Hard (28°F) | Feb 21 | Jan 13 | Dec 18 |
| Severe (24°F) | Jan 25 | Dec 31 | Dec 11 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 19 | Apr 12 | Apr 8 | Apr 4 | Mar 30 | Mar 24 | Mar 17 | Mar 11 | Mar 1 |
| 32°F | Mar 30 | Mar 14 | Mar 5 | Feb 28 | Feb 22 | Feb 16 | Feb 8 | Jan 31 | Jan 17 |
| 28°F | Feb 21 | Feb 5 | Jan 28 | Jan 20 | Jan 13 | Jan 5 | Dec 31 | Dec 25 | Dec 18 |
| 24°F | Jan 25 | Jan 15 | Jan 8 | Jan 3 | Dec 31 | Dec 28 | Dec 24 | Dec 18 | Dec 11 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Nov 1 | Nov 15 | Nov 30 |
| Freeze (32°F) | Nov 12 | Nov 29 | Dec 18 |
| Hard (28°F) | Nov 28 | Dec 15 | Jan 12 |
| Severe (24°F) | Dec 5 | Dec 25 | Jan 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Nov 1 | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 18 | Nov 21 | Nov 25 | Nov 30 |
| 32°F | Nov 12 | Nov 18 | Nov 22 | Nov 26 | Nov 29 | Dec 1 | Dec 6 | Dec 10 | Dec 18 |
| 28°F | Nov 28 | Dec 2 | Dec 6 | Dec 11 | Dec 15 | Dec 19 | Dec 26 | Jan 1 | Jan 12 |
| 24°F | Dec 5 | Dec 12 | Dec 17 | Dec 21 | Dec 25 | Dec 29 | Jan 2 | Jan 8 | Jan 19 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Red Bluff Muni Ap, Ca, about 19.5 miles away@if(!empty($station['elevation_ft'])), at 353 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Vina, CA?
On average, the last spring frost (32°F) around Vina, CA is about Feb 22. In cooler years it can run later, so for a safer bet many gardeners wait until Jan 17.
When is the first frost in the fall?
The first fall frost around Vina, CA typically arrives about Nov 29. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Feb 22 on average, or Jan 17 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 281 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 96092 Planting calendar → California frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026