USDA Hardiness Zone 10a
Frost Dates for 91321 — Santa Clarita, California
NOAA 1991–2020 normals from Newhall 5NW, CA (1,765 ft), 5 miles west.
Updated
Frost is not a yearly event in Santa Clarita: a night at or below 32°F came in 37% of the winters of 1991–2020 at Newhall 5NW, CA, and a 36°F night, cold enough for frost on exposed leaves, in 93%. There is no reliable "last frost date" here; most years have none.
- Winters with a freeze
- 37%
- Winters with 36°F
- 93%
- Coldest month low
- 44°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 18 observed
NOAA normal
Frost risk by date in Santa Clarita
At Newhall 5NW, CA, 5 miles west of Santa Clarita, 37% of the winters of 1991–2020 had at least one night at or below 32°F, 3% reached 28°F. Nights of 36°F, enough for frost on exposed leaves, are more common (93% of winters) and, when they come, fall between about December 19 and February 22. January is the month most likely to bring one: a 16% 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°F93% of yrs | Dec 21 | Jan 5 | Jan 25 | Feb 7 | Feb 22 | Mar 1 | Mar 12 | Mar 27 | Apr 8 |
| 32°F37% of yrs | too rare for a date | ||||||||
| 28°F3% of yrs | too rare for a date | ||||||||
| 24°F0% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F93% of yrs | Nov 23 | Dec 1 | Dec 8 | Dec 12 | Dec 19 | Dec 24 | Dec 28 | Jan 11 | Feb 8 |
| 32°F37% of yrs | too rare for a date | ||||||||
| 28°F3% of yrs | too rare for a date | ||||||||
| 24°F0% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Newhall 5NW, 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 91321 →Compare Santa Clarita with another place →
Weather by month in Santa Clarita
August is the warmest month at Newhall 5NW, CA, averaging 96°F by day and 64°F at night; December is the coldest at 62°F and 44°F. From February to November the chance of a 32°F night stays under 10% each month.
Warmth for growing adds up to 5,822 growing degree days a year (base 50°F), more than at 87% of the 283 California stations. 37% of them (2,164) have built up by the end of June, and August adds the most, 928. Precipitation totals 16.6 inches a year, most in February (4.4") and least in June (0.0"); May to September bring 2% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 63 | 47 | 4.2 | 16% | 1 | 185 |
| Feb | 65 | 45 | 4.4 | 3% | 0 | 155 |
| Mar | 70 | 47 | 2.9 | 5% | <1 | 283 |
| Apr | 74 | 49 | 0.8 | 1% | <1 | 348 |
| May | 81 | 54 | 0.3 | 0% | 0 | 532 |
| Jun | 87 | 57 | 0.0 | 0% | 0 | 662 |
| Jul | 94 | 63 | 0.0 | 0% | 0 | 889 |
| Aug | 96 | 64 | 0.0 | 0% | 0 | 928 |
| Sep | 91 | 62 | 0.1 | 0% | 0 | 799 |
| Oct | 81 | 56 | 0.5 | 0% | 0 | 580 |
| Nov | 71 | 49 | 0.8 | 4% | 0 | 315 |
| Dec | 62 | 44 | 2.6 | 16% | <1 | 146 |
Monthly normals 1991–2020 at Newhall 5NW, CA (1,765 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, Northridge Cal State, CA, 9 miles south of Santa Clarita and 861 feet lower, has a 32°F night in 18% of winters against 37% here, and a coolest-month low 2°F warmer (46°F).
When it snows in Santa Clarita, California
Measurable snow is rare here: only 0 of 18 winters from 1991 to 2020 recorded 0.1 inch or more at Pacoima Dam Fc33a-E, CA, 7.3 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 91321 is 5 miles from Newhall 5NW, CA, which stands at 1,765 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 7 other ZIP codes share the station; its figures are presented in full for 91387 (Canyon Country). The 2023 USDA Plant Hardiness Zone Map lists ZIP 91321 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.