USDA Hardiness Zone 10a
Frost Dates for 94806 — San Pablo, California
NOAA 1991–2020 normals from Richmond, CA (20 ft), 4 miles southwest.
Updated
Frost is not a yearly event in San Pablo: a night at or below 32°F came in 22% of the winters of 1991–2020 at Richmond, CA, and a 36°F night, cold enough for frost on exposed leaves, in 80%. There is no reliable "last frost date" here; most years have none.
- Winters with a freeze
- 22%
- Winters with 36°F
- 80%
- Coldest month low
- 44°F
- Hardiness zone
- 10a
32°F or below, 1991–2020
frost possible on leaves
average, January
30 to 35°F (-1.1 to 1.7°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 10%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
2 of 20 observed
NOAA normal
Frost risk by date in San Pablo
At Richmond, CA, 4 miles southwest of San Pablo, 22% of the winters of 1991–2020 had at least one night at or below 32°F, 0% reached 28°F. Nights of 36°F, enough for frost on exposed leaves, are more common (80% of winters) and, when they come, fall between about December 24 and January 17. January is the month most likely to bring one: a 14% 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°F80% of yrs | Dec 22 | Dec 31 | Jan 4 | Jan 11 | Jan 17 | Jan 23 | Jan 30 | Feb 8 | Feb 23 |
| 32°F22% of yrs | too rare for a date | ||||||||
| 28°F0% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F80% of yrs | Dec 2 | Dec 9 | Dec 14 | Dec 19 | Dec 24 | Dec 30 | Jan 3 | Jan 10 | Jan 21 |
| 32°F22% of yrs | too rare for a date | ||||||||
| 28°F0% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Richmond, 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 94806 →Compare San Pablo with another place →
Weather by month in San Pablo
September is the warmest month at Richmond, CA, averaging 75°F by day and 56°F at night; January is the coldest at 58°F and 44°F. From February to December the chance of a 32°F night stays under 10% each month.
Warmth for growing adds up to 3,322 growing degree days a year (base 50°F), fewer than at 76% of the 283 California stations. 40% of them (1,331) have built up by the end of June, and September adds the most, 464. Precipitation totals 24.5 inches a year, most in December (4.9") and least in July (0.0"); May to September bring 4% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 58 | 44 | 4.8 | 14% | <1 | 70 |
| Feb | 61 | 46 | 4.8 | 1% | 0 | 114 |
| Mar | 64 | 47 | 3.2 | 0% | 0 | 184 |
| Apr | 67 | 49 | 1.6 | 0% | 0 | 248 |
| May | 69 | 52 | 0.7 | 0% | 0 | 326 |
| Jun | 72 | 54 | 0.3 | 0% | 0 | 390 |
| Jul | 71 | 55 | 0.0 | 0% | 0 | 403 |
| Aug | 72 | 56 | 0.1 | 0% | 0 | 436 |
| Sep | 75 | 56 | 0.0 | 0% | 0 | 464 |
| Oct | 73 | 54 | 1.4 | 0% | 0 | 411 |
| Nov | 65 | 49 | 2.7 | 0% | 0 | 206 |
| Dec | 58 | 44 | 4.9 | 10% | <1 | 72 |
Monthly normals 1991–2020 at Richmond, CA (20 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, Berkeley, CA, 8 miles southeast of San Pablo and 290 feet higher, has a 32°F night in 27% of winters against 22% here, and a coolest-month low 1°F colder (43°F).
When it snows in San Pablo, California
Measurable snow is rare here: only 2 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Richmond, CA, 4.2 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 94806 is 4 miles from Richmond, CA, which stands at 20 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 94806 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.