Last spring frost
May 28
Frost Dates for Adin, CA
First fall frost
Sep 29
Growing season
125 days
Hardiness zone
7a
In an average year around Adin, CA, the last spring frost (32°F) is about May 28 and the first fall frost is about Sep 29, giving roughly a 125-day growing season. To be safe most years, wait until May 7 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) | Jun 29 | Jun 13 | May 28 |
| Freeze (32°F) | Jun 16 | May 28 | May 7 |
| Hard (28°F) | May 29 | May 2 | Apr 16 |
| Severe (24°F) | May 2 | Apr 13 | Mar 23 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 29 | Jun 23 | Jun 20 | Jun 16 | Jun 13 | Jun 10 | Jun 7 | Jun 3 | May 28 |
| 32°F | Jun 16 | Jun 10 | Jun 4 | Jun 1 | May 28 | May 23 | May 19 | May 13 | May 7 |
| 28°F | May 29 | May 19 | May 12 | May 6 | May 2 | Apr 30 | Apr 27 | Apr 23 | Apr 16 |
| 24°F | May 2 | Apr 27 | Apr 21 | Apr 17 | Apr 13 | Apr 9 | Apr 5 | Mar 31 | Mar 23 |
| 20°F | Apr 12 | Apr 5 | Apr 1 | Mar 28 | Mar 22 | Mar 16 | Mar 11 | Mar 4 | Feb 24 |
| 16°F | Mar 26 | Mar 15 | Mar 8 | Mar 1 | Feb 24 | Feb 18 | Feb 11 | Feb 3 | Jan 17 |
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) | Aug 26 | Sep 15 | Oct 1 |
| Freeze (32°F) | Sep 10 | Sep 29 | Oct 15 |
| Hard (28°F) | Sep 27 | Oct 13 | Nov 2 |
| Severe (24°F) | Oct 9 | Oct 30 | Nov 16 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Aug 26 | Sep 3 | Sep 7 | Sep 11 | Sep 15 | Sep 18 | Sep 21 | Sep 24 | Oct 1 |
| 32°F | Sep 10 | Sep 17 | Sep 22 | Sep 26 | Sep 29 | Oct 1 | Oct 4 | Oct 9 | Oct 15 |
| 28°F | Sep 27 | Oct 2 | Oct 5 | Oct 9 | Oct 13 | Oct 17 | Oct 21 | Oct 26 | Nov 2 |
| 24°F | Oct 9 | Oct 16 | Oct 21 | Oct 26 | Oct 30 | Nov 3 | Nov 6 | Nov 11 | Nov 16 |
| 20°F | Oct 22 | Oct 30 | Nov 3 | Nov 8 | Nov 12 | Nov 16 | Nov 20 | Nov 25 | Dec 1 |
| 16°F | Nov 3 | Nov 12 | Nov 17 | Nov 22 | Nov 26 | Nov 30 | Dec 3 | Dec 8 | Dec 16 |
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: Adin Rs, Ca, about 6.7 miles away@if(!empty($station['elevation_ft'])), at 4,195 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 Adin, CA?
On average, the last spring frost (32°F) around Adin, CA is about May 28. In cooler years it can run later, so for a safer bet many gardeners wait until May 7.
When is the first frost in the fall?
The first fall frost around Adin, CA typically arrives about Sep 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 May 28 on average, or May 7 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 125 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 96006 Planting calendar → California frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026