Last spring frost
May 16
Frost Dates for Wrightwood, CA
First fall frost
Oct 13
Growing season
151 days
Hardiness zone
8a
In an average year around Wrightwood, CA, the last spring frost (32°F) is about May 16 and the first fall frost is about Oct 13, giving roughly a 151-day growing season. To be safe most years, wait until Apr 25 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 20 | Jun 4 | May 14 |
| Freeze (32°F) | Jun 9 | May 16 | Apr 25 |
| Hard (28°F) | May 13 | Apr 25 | Apr 6 |
| Severe (24°F) | Apr 25 | Apr 4 | Mar 7 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 20 | Jun 15 | Jun 11 | Jun 8 | Jun 4 | Jun 1 | May 28 | May 23 | May 14 |
| 32°F | Jun 9 | Jun 3 | May 29 | May 22 | May 16 | May 10 | May 4 | Apr 30 | Apr 25 |
| 28°F | May 13 | May 4 | May 1 | Apr 28 | Apr 25 | Apr 21 | Apr 17 | Apr 12 | Apr 6 |
| 24°F | Apr 25 | Apr 19 | Apr 13 | Apr 9 | Apr 4 | Mar 29 | Mar 22 | Mar 15 | Mar 7 |
| 20°F | Apr 12 | Apr 2 | Mar 22 | Mar 13 | Mar 7 | Mar 2 | Feb 26 | Feb 19 | Feb 9 |
| 16°F | Mar 13 | Mar 2 | Feb 25 | Feb 20 | Feb 14 | Feb 6 | Jan 29 | Jan 15 | Dec 31 |
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 10 | Oct 1 | Oct 17 |
| Freeze (32°F) | Sep 25 | Oct 13 | Nov 1 |
| Hard (28°F) | Oct 10 | Oct 30 | Nov 13 |
| Severe (24°F) | Oct 22 | Nov 12 | Dec 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 10 | Sep 19 | Sep 24 | Sep 29 | Oct 1 | Oct 4 | Oct 7 | Oct 11 | Oct 17 |
| 32°F | Sep 25 | Oct 1 | Oct 5 | Oct 9 | Oct 13 | Oct 16 | Oct 20 | Oct 25 | Nov 1 |
| 28°F | Oct 10 | Oct 15 | Oct 20 | Oct 26 | Oct 30 | Nov 2 | Nov 5 | Nov 8 | Nov 13 |
| 24°F | Oct 22 | Oct 30 | Nov 4 | Nov 8 | Nov 12 | Nov 16 | Nov 20 | Nov 25 | Dec 1 |
| 20°F | Nov 7 | Nov 16 | Nov 20 | Nov 25 | Nov 29 | Dec 2 | Dec 6 | Dec 12 | Dec 20 |
| 16°F | Nov 23 | Nov 29 | Dec 4 | Dec 11 | Dec 17 | Dec 25 | Jan 1 | Jan 17 | Feb 3 |
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: Wrightwood, Ca, about 10 miles away@if(!empty($station['elevation_ft'])), at 6,000 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 Wrightwood, CA?
On average, the last spring frost (32°F) around Wrightwood, CA is about May 16. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 25.
When is the first frost in the fall?
The first fall frost around Wrightwood, CA typically arrives about Oct 13. 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 16 on average, or Apr 25 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 151 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 93563 Planting calendar → California frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026