Frost Dates for 92307 — Apple Valley, California

Half of springs at Victorville, CA see their last 32°F night by March 18; only one in ten is past it by February 23, and one in ten still has one after April 12. Planting tender crops after March 31 leaves a 30% risk of a frost on them, after April 5 20%, and after April 12 10%. The 25 days between the even-odds date and the one-in-ten date is narrower than at 70% 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 November 11 in half of years, as early as October 27 one year in ten, and holds off past November 26 one year in ten. A hard freeze of 28°F follows 13 days later, around November 24; in spring the one-in-ten date for 28°F is March 19, 24 days before the 32°F one. The freeze-free season lasts 233 days in a typical year, shorter than at 73% of the 219 California stations; it reaches 262 days one year in ten and falls short of 203 one year in ten. On average 54 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 24 days longer, to about April 11, and return around November 1. Nights of 24°F, cold enough to damage hardier plants, come in 97% of winters and 16°F in 16%.

July is the warmest month at Victorville, CA, averaging 98°F by day and 64°F at night; December is the coldest at 57°F and 33°F. A freezing night is all but certain in every month from November to February (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 76% of years and April still brings one in 30% of years.

Warmth for growing adds up to 4,932 growing degree days a year (base 50°F), more than at 61% of the 283 California stations. 35% of them (1,744) have built up by the end of June, and July adds the most, 956. Precipitation totals 5.6 inches a year, most in February (1.3") and least in June (0.0"); May to September bring 11% of it.

The nearest other station, Hesperia 2E, CA, 10 miles southwest of Apple Valley and 175 feet higher, has a last frost 18 days earlier (February 28), a first frost 20 days later (December 1), a season 37 days longer.

Measurable snow is rare here: only 2 of 18 winters from 1991 to 2020 recorded 0.1 inch or more at Victorville, CA, 6.6 miles away, so there is no typical first-snow date to plan around.

ZIP 92307 is 7 miles from Victorville, CA, which stands at 2,880 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 92392 (Victorville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 92307 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°C) over 1991–2020; a zone describes winter lows, not frost dates.