Frost Dates for 93622 — Firebaugh, California

In the 90% of winters that bring a 32°F night, half of springs at Los Banos Det Resv, CA see their last 32°F night by January 13; only one in ten is past it by December 22, and one in ten still has one after February 10. Counting the winters with no freeze at all, the risk of a 32°F night after February 10 is under 9% and after January 13 45%. 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 14 in half of years, as early as December 1 one year in ten, and holds off past January 10 one year in ten. A hard freeze of 28°F is less common: it came in 43% of winters. The freeze-free season lasts 338 days in a typical year, longer than at 89% of the 219 California stations; it reaches 365 days one year in ten and falls short of 305 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 26 days longer, to about February 8, and return around December 2. A 24°F night is unusual: 5% of winters had one.

July is the warmest month at Los Banos Det Resv, CA, averaging 95°F by day and 66°F at night; December is the coldest at 56°F and 39°F. From March to November the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 18% of years.

Warmth for growing adds up to 5,414 growing degree days a year (base 50°F), more than at 77% of the 283 California stations. 37% of them (2,029) have built up by the end of June, and July adds the most, 942. Precipitation totals 8.0 inches a year, most in January (1.8") and least in July (0.0"); May to September bring 6% of it.

The nearest other station, Los Banos, CA, 24 miles northwest of Firebaugh and 287 feet lower, has a last frost 13 days later (January 26), a first frost 4 days earlier (December 10), a season 16 days shorter.

Measurable snow is rare here: only 0 of 17 winters from 1991 to 2020 recorded 0.1 inch or more at Los Banos Det Resv, CA, 23.4 miles away, so there is no typical first-snow date to plan around.

ZIP 93622 is 23 miles from Los Banos Det Resv, CA, which stands at 407 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 93622 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.