Frost Dates for 93667 — Tollhouse, California

Half of springs at Auberry 2 NW, CA see their last 32°F night by March 25; only one in ten is past it by February 5, and one in ten still has one after April 22. Planting tender crops after April 7 leaves a 30% risk of a frost on them, after April 13 20%, and after April 22 10%. The 28 days between the even-odds date and the one-in-ten date is narrower than at 60% 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 3 in half of years, as early as November 14 one year in ten, and holds off past December 21 one year in ten. A hard freeze of 28°F follows 14 days later, around December 17; in spring the one-in-ten date for 28°F is April 1, 21 days before the 32°F one. The freeze-free season lasts 253 days in a typical year, shorter than at 66% of the 219 California stations; it reaches 305 days one year in ten and falls short of 214 one year in ten. On average 23 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 23 days longer, to about April 17, and return around November 17. A 24°F night is unusual: 30% of winters had one.

July is the warmest month at Auberry 2 NW, CA, averaging 94°F by day and 68°F at night; December is the coldest at 54°F and 37°F. A freezing night is all but certain in every month from December to January (a 90% chance or more). From May to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 72% of years and March still brings one in 56% of years and April still brings one in 38% of years.

Warmth for growing adds up to 4,836 growing degree days a year (base 50°F), more than at 59% of the 283 California stations. 33% of them (1,599) have built up by the end of June, and July adds the most, 972. Precipitation totals 25.1 inches a year, most in January (5.3") and least in August (0.0"); May to September bring 6% of it.

The nearest other station, Friant Government Camp, CA, 18 miles west of Tollhouse and 1,680 feet lower, has a last frost 16 days earlier (March 9), a first frost 2 days earlier (December 1), a season 9 days longer.

Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Pine Flat Dam, CA, 11.3 miles away, so there is no typical first-snow date to plan around.

ZIP 93667 is 11 miles from Auberry 2 NW, CA, which stands at 2,090 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 93602 (Auberry). The 2023 USDA Plant Hardiness Zone Map lists ZIP 93667 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°C) over 1991–2020; a zone describes winter lows, not frost dates.