USDA Hardiness Zone 10a
Frost Dates for 92004 — Borrego Springs, California
NOAA 1991–2020 normals from Ocotillo Wells 2W, CA (390 ft), 6 miles east.
Updated
Frost is not a yearly event in Borrego Springs: a night at or below 32°F came in 17% of the winters of 1991–2020 at Ocotillo Wells 2W, CA, and a 36°F night, cold enough for frost on exposed leaves, in 60%. There is no reliable "last frost date" here; most years have none.
- Winters with a freeze
- 17%
- Winters with 36°F
- 60%
- Coldest month low
- 47°F
- Hardiness zone
- 10a
32°F or below, 1991–2020
frost possible on leaves
average, December
30 to 35°F (-1.1 to 1.7°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 20 observed
NOAA normal
Frost risk by date in Borrego Springs
At Ocotillo Wells 2W, CA, 6 miles east of Borrego Springs, 17% of the winters of 1991–2020 had at least one night at or below 32°F, 2% reached 28°F. Nights of 36°F, enough for frost on exposed leaves, are more common (60% of winters) and, when they come, fall between about December 26 and January 5. January is the month most likely to bring one: a 8% chance in a given year. 62 of the 283 other California stations behind this site's ZIP pages freeze in fewer than half of winters too.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F60% of yrs | Dec 11 | Dec 19 | Dec 28 | Dec 31 | Jan 5 | Jan 11 | Jan 21 | Jan 30 | Feb 12 |
| 32°F17% of yrs | too rare for a date | ||||||||
| 28°F2% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F60% of yrs | Dec 3 | Dec 11 | Dec 15 | Dec 22 | Dec 26 | Dec 29 | Jan 2 | Jan 9 | Jan 25 |
| 32°F17% of yrs | too rare for a date | ||||||||
| 28°F2% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Ocotillo Wells 2W, CA, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 92004 →Compare Borrego Springs with another place →
Weather by month in Borrego Springs
July is the warmest month at Ocotillo Wells 2W, CA, averaging 108°F by day and 83°F at night; December is the coldest at 68°F and 47°F. Every month stays under a 10% chance of a 32°F night; January is the likeliest at 8%.
Warmth for growing adds up to 9,743 growing degree days a year (base 50°F), the most of the 283 California stations. 42% of them (4,056) have built up by the end of June, and July adds the most, 1,417. Precipitation totals 4.1 inches a year, most in February (0.8") and least in May (0.0"); May to September bring 24% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 69 | 49 | 0.7 | 8% | <1 | 278 |
| Feb | 73 | 52 | 0.8 | 3% | <1 | 350 |
| Mar | 80 | 58 | 0.5 | 0% | 0 | 580 |
| Apr | 86 | 61 | 0.1 | 0% | 0 | 707 |
| May | 94 | 69 | 0.0 | 0% | 0 | 975 |
| Jun | 102 | 76 | 0.0 | 0% | 0 | 1167 |
| Jul | 108 | 83 | 0.3 | 0% | 0 | 1417 |
| Aug | 108 | 84 | 0.4 | 0% | 0 | 1415 |
| Sep | 102 | 78 | 0.3 | 0% | 0 | 1197 |
| Oct | 91 | 68 | 0.3 | 0% | 0 | 902 |
| Nov | 79 | 56 | 0.2 | 0% | 0 | 515 |
| Dec | 68 | 47 | 0.5 | 7% | <1 | 241 |
Monthly normals 1991–2020 at Ocotillo Wells 2W, CA (390 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Cuyamaca, CA, 23 miles southwest of Borrego Springs and 4,250 feet higher, has a 32°F night in 100% of winters against 17% here, and a coolest-month low 15°F colder (32°F).
When it snows in Borrego Springs, California
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Borrego Desert Park, CA, 9.4 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 92004 is 6 miles from Ocotillo Wells 2W, CA, which stands at 390 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 92004 in zone 10a, the band where the coldest night of the year averaged 30 to 35°F (-1.1 to 1.7°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across California →
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.