Frost Dates for 95993 — Yuba City, California

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.

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.

The nearest other station, Marysville Yuba Co Airport, CA, 6 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.

Measurable snow is rare here: only 1 of 17 winters from 1991 to 2020 recorded 0.1 inch or more at Marysville, CA, 5.7 miles away, so there is no typical first-snow date to plan around.

ZIP 95993 is 6 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; its figures are presented in full for 95991 (Yuba City). The 2023 USDA Plant Hardiness Zone Map lists ZIP 95993 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.