Last spring frost
Apr 29
Frost Dates for Jacumba, CA
First fall frost
Nov 1
Growing season
184 days
Hardiness zone
9b
In an average year around Jacumba, CA, the last spring frost (32°F) is about Apr 29 and the first fall frost is about Nov 1, giving roughly a 184-day growing season. To be safe most years, wait until Apr 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 23 | May 31 | May 2 |
| Freeze (32°F) | Jun 1 | Apr 29 | Apr 7 |
| Hard (28°F) | Apr 26 | Mar 31 | Feb 23 |
| Severe (24°F) | Mar 24 | Feb 13 | Dec 24 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 23 | Jun 14 | Jun 8 | Jun 4 | May 31 | May 26 | May 22 | May 14 | May 2 |
| 32°F | Jun 1 | May 22 | May 13 | May 4 | Apr 29 | Apr 24 | Apr 19 | Apr 13 | Apr 7 |
| 28°F | Apr 26 | Apr 14 | Apr 8 | Apr 4 | Mar 31 | Mar 24 | Mar 16 | Mar 6 | Feb 23 |
| 24°F | Mar 24 | Mar 10 | Feb 28 | Feb 20 | Feb 13 | Feb 4 | Jan 28 | Jan 10 | Dec 24 |
| 20°F | Feb 28 | Feb 18 | Feb 9 | Feb 2 | Jan 25 | Jan 19 | Jan 7 | Dec 27 | Dec 19 |
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 12 | Oct 8 | Nov 1 |
| Freeze (32°F) | Oct 5 | Nov 1 | Nov 23 |
| Hard (28°F) | Oct 29 | Nov 27 | Dec 18 |
| Severe (24°F) | Nov 25 | Dec 16 | Feb 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 12 | Sep 24 | Sep 29 | Oct 3 | Oct 8 | Oct 13 | Oct 17 | Oct 24 | Nov 1 |
| 32°F | Oct 5 | Oct 13 | Oct 21 | Oct 27 | Nov 1 | Nov 3 | Nov 8 | Nov 15 | Nov 23 |
| 28°F | Oct 29 | Nov 6 | Nov 13 | Nov 21 | Nov 27 | Dec 1 | Dec 4 | Dec 9 | Dec 18 |
| 24°F | Nov 25 | Dec 2 | Dec 6 | Dec 10 | Dec 16 | Dec 22 | Jan 1 | Jan 12 | Feb 2 |
| 20°F | Dec 11 | Dec 20 | Dec 27 | Jan 1 | Jan 10 | Jan 19 | Jan 28 | Feb 8 | Feb 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: Campo Asos, Ca, about 18.4 miles away@if(!empty($station['elevation_ft'])), at 2,641 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 Jacumba, CA?
On average, the last spring frost (32°F) around Jacumba, CA is about Apr 29. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 7.
When is the first frost in the fall?
The first fall frost around Jacumba, CA typically arrives about Nov 1. 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 29 on average, or Apr 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 184 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 91934 Planting calendar → California frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026