USDA Hardiness Zone 9b
Frost Dates for 95991 — Yuba City, California
NOAA 1991–2020 normals from Marysville, CA (57 ft), 3 miles northeast.
Updated
A freeze (32°F) reaches Yuba City in 89% of winters. When it does, the first fall frost comes around December 12 and the last spring frost around January 15; after February 18 the chance of another is under 9%.
- Last spring frost
- January 15
- First fall frost
- December 12
- Winters with a freeze
- 89%
- Hardiness zone
- 9b
50%, in freezing years
50%, in freezing years
32°F or below, 1991–2020
25 to 30°F (-3.9 to -1.1°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 6%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
1 of 17 observed
NOAA normal
Frost risk by date in Yuba City
In the 89% of winters that bring a 32°F night, half of springs at Marysville, CA see their last 32°F night by January 15; only one in ten is past it by December 18, and one in ten still has one after February 18. Counting the winters with no freeze at all, the risk of a 32°F night after February 18 is under 9% and after January 15 44%. The 34 days between the even-odds date and the one-in-ten date is wider than at 65% of the 220 California stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.
In fall the first 32°F night comes by December 12 in half of years, as early as November 24 one year in ten, and holds off past January 9 one year in ten. A hard freeze of 28°F is less common: it came in 41% of winters. The freeze-free season lasts 333 days in a typical year, longer than at 84% of the 219 California stations; it reaches 365 days one year in ten and falls short of 299 one year in ten. On average 8 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 37 days longer, to about February 21, and return around November 28. A 24°F night is unusual: 6% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jan 18 | Jan 30 | Feb 7 | Feb 14 | Feb 21 | Feb 27 | Mar 3 | Mar 9 | Mar 23 |
| 32°F89% of yrs | Dec 18 | Dec 28 | Jan 2 | Jan 8 | Jan 15 | Jan 22 | Jan 30 | Feb 5 | Feb 18 |
| 28°F41% of yrs | too rare for a date | ||||||||
| 24°F6% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Nov 13 | Nov 18 | Nov 21 | Nov 24 | Nov 28 | Dec 1 | Dec 4 | Dec 9 | Dec 19 |
| 32°F89% of yrs | Nov 24 | Nov 30 | Dec 4 | Dec 7 | Dec 12 | Dec 17 | Dec 22 | Dec 30 | Jan 9 |
| 28°F41% of yrs | too rare for a date | ||||||||
| 24°F6% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Marysville, 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 95991 →Compare Yuba City with another place →
Weather by month in Yuba City
July is the warmest month at Marysville, CA, averaging 98°F by day and 64°F at night; January is the coldest at 57°F and 40°F. From March to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 24% of years.
Warmth for growing adds up to 5,478 growing degree days a year (base 50°F), more than at 80% of the 283 California stations. 38% of them (2,109) have built up by the end of June, and July adds the most, 959.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 57 | 40 | 57% | 3 | 41 |
| Feb | 63 | 43 | 24% | 1 | 99 |
| Mar | 68 | 46 | 2% | <1 | 225 |
| Apr | 75 | 49 | 0% | 0 | 358 |
| May | 83 | 56 | 0% | 0 | 594 |
| Jun | 92 | 61 | 0% | 0 | 792 |
| Jul | 98 | 64 | 0% | 0 | 959 |
| Aug | 97 | 63 | 0% | 0 | 925 |
| Sep | 91 | 60 | 0% | 0 | 756 |
| Oct | 80 | 53 | 0% | 0 | 508 |
| Nov | 67 | 44 | 19% | 1 | 176 |
| Dec | 58 | 40 | 68% | 4 | 45 |
Monthly normals 1991–2020 at Marysville, CA (57 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, Marysville Yuba Co Airport, CA, 3 miles east of Yuba City, has a last frost 27 days later (February 11), a first frost 12 days earlier (November 30), a season 44 days shorter.
When it snows in Yuba City, California
Measurable snow is rare here: only 1 of 17 winters from 1991 to 2020 recorded 0.1 inch or more at Marysville, CA, 2.9 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 95991 is 3 miles from Marysville, CA, which stands at 57 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 95991 in zone 9b, the band where the coldest night of the year averaged 25 to 30°F (-3.9 to -1.1°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.