Last spring frost
Apr 16
Frost Dates for Trinity Village, CA
First fall frost
Oct 31
Growing season
197 days
Hardiness zone
8b
In an average year around Trinity Village, CA, the last spring frost (32°F) is about Apr 16 and the first fall frost is about Oct 31, giving roughly a 197-day growing season. To be safe most years, wait until Mar 23 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) | May 29 | May 6 | Apr 21 |
| Freeze (32°F) | May 3 | Apr 16 | Mar 23 |
| Hard (28°F) | Apr 16 | Mar 17 | Feb 2 |
| Severe (24°F) | Mar 8 | Jan 31 | Dec 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 29 | May 19 | May 14 | May 10 | May 6 | May 4 | May 1 | Apr 27 | Apr 21 |
| 32°F | May 3 | Apr 28 | Apr 24 | Apr 20 | Apr 16 | Apr 11 | Apr 7 | Apr 1 | Mar 23 |
| 28°F | Apr 16 | Apr 5 | Mar 31 | Mar 24 | Mar 17 | Mar 10 | Feb 28 | Feb 20 | Feb 2 |
| 24°F | Mar 8 | Feb 26 | Feb 16 | Feb 7 | Jan 31 | Jan 19 | Jan 7 | Dec 28 | Dec 12 |
| 20°F | Feb 10 | Jan 29 | Jan 21 | Jan 10 | Jan 4 | Dec 30 | Dec 21 | Dec 9 | Nov 29 |
| 16°F | Jan 24 | Jan 17 | Jan 1 | Dec 26 | Dec 21 | Dec 16 | Dec 8 | Dec 3 | Nov 29 |
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) | Sep 27 | Oct 14 | Nov 1 |
| Freeze (32°F) | Oct 13 | Oct 31 | Nov 26 |
| Hard (28°F) | Oct 24 | Nov 19 | Dec 20 |
| Severe (24°F) | Nov 7 | Dec 9 | Jan 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 27 | Oct 2 | Oct 6 | Oct 10 | Oct 14 | Oct 17 | Oct 22 | Oct 26 | Nov 1 |
| 32°F | Oct 13 | Oct 18 | Oct 23 | Oct 27 | Oct 31 | Nov 3 | Nov 9 | Nov 17 | Nov 26 |
| 28°F | Oct 24 | Oct 31 | Nov 4 | Nov 12 | Nov 19 | Nov 24 | Dec 1 | Dec 9 | Dec 20 |
| 24°F | Nov 7 | Nov 17 | Nov 26 | Dec 2 | Dec 9 | Dec 16 | Dec 27 | Jan 6 | Jan 28 |
| 20°F | Nov 21 | Nov 29 | Dec 5 | Dec 13 | Dec 23 | Dec 31 | Jan 7 | Jan 19 | Jan 30 |
| 16°F | Nov 27 | Dec 1 | Dec 5 | Dec 12 | Dec 17 | Dec 23 | Dec 30 | Jan 4 | Jan 23 |
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: Big Bar 4 E, Ca, about 18.3 miles away@if(!empty($station['elevation_ft'])), at 1,253 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 Trinity Village, CA?
On average, the last spring frost (32°F) around Trinity Village, CA is about Apr 16. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 23.
When is the first frost in the fall?
The first fall frost around Trinity Village, CA typically arrives about Oct 31. 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 Apr 16 on average, or Mar 23 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 197 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 95527 Planting calendar → California frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026