Last spring frost
Feb 25
Frost Dates for Kelseyville, CA
First fall frost
Dec 3
Growing season
279 days
Hardiness zone
8b
In an average year around Kelseyville, CA, the last spring frost (32°F) is about Feb 25 and the first fall frost is about Dec 3, giving roughly a 279-day growing season. To be safe most years, wait until Jan 18 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 27 | Apr 5 | Mar 4 |
| Freeze (32°F) | Apr 2 | Feb 25 | Jan 18 |
| Hard (28°F) | Feb 21 | Jan 12 | Dec 20 |
| Severe (24°F) | Jan 23 | Dec 31 | Dec 8 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 27 | Apr 19 | Apr 15 | Apr 9 | Apr 5 | Mar 31 | Mar 27 | Mar 16 | Mar 4 |
| 32°F | Apr 2 | Mar 24 | Mar 10 | Mar 2 | Feb 25 | Feb 17 | Feb 8 | Jan 29 | Jan 18 |
| 28°F | Feb 21 | Feb 5 | Jan 28 | Jan 19 | Jan 12 | Jan 6 | Jan 1 | Dec 27 | Dec 20 |
| 24°F | Jan 23 | Jan 14 | Jan 8 | Jan 3 | Dec 31 | Dec 28 | Dec 21 | Dec 17 | Dec 8 |
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) | Oct 29 | Nov 14 | Dec 2 |
| Freeze (32°F) | Nov 14 | Dec 3 | Dec 25 |
| Hard (28°F) | Nov 27 | Dec 19 | Jan 18 |
| Severe (24°F) | Dec 2 | Dec 27 | Jan 20 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 29 | Nov 2 | Nov 7 | Nov 11 | Nov 14 | Nov 18 | Nov 22 | Nov 27 | Dec 2 |
| 32°F | Nov 14 | Nov 20 | Nov 26 | Nov 30 | Dec 3 | Dec 6 | Dec 11 | Dec 16 | Dec 25 |
| 28°F | Nov 27 | Dec 3 | Dec 9 | Dec 13 | Dec 19 | Dec 24 | Dec 31 | Jan 5 | Jan 18 |
| 24°F | Dec 2 | Dec 11 | Dec 17 | Dec 22 | Dec 27 | Dec 31 | Jan 4 | Jan 9 | Jan 20 |
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: Cloverdale, Ca, about 16.6 miles away@if(!empty($station['elevation_ft'])), at 400 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 Kelseyville, CA?
On average, the last spring frost (32°F) around Kelseyville, CA is about Feb 25. In cooler years it can run later, so for a safer bet many gardeners wait until Jan 18.
When is the first frost in the fall?
The first fall frost around Kelseyville, CA typically arrives about Dec 3. 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 25 on average, or Jan 18 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 279 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 95435 Planting calendar → California frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026