Frost Dates for 91962 — Pine Valley, California

Half of springs at Mt Laguna #3, CA see their last 32°F night by April 22; only one in ten is past it by March 25, and one in ten still has one after May 21. Planting tender crops after May 4 leaves a 30% risk of a frost on them, after May 13 20%, and after May 21 10%. The 29 days between the even-odds date and the one-in-ten date is narrower than at 52% 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 8 in half of years, as early as October 10 one year in ten, and holds off past December 4 one year in ten. A hard freeze of 28°F follows 23 days later, around December 1; in spring the one-in-ten date for 28°F is May 8, 13 days before the 32°F one. The freeze-free season lasts 197 days in a typical year, shorter than at 81% of the 219 California stations; it reaches 232 days one year in ten and falls short of 163 one year in ten. On average 63 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 18 days longer, to about May 10, and return around October 23. Nights of 24°F, cold enough to damage hardier plants, come in 97% of winters and 16°F in 29%.

July is the warmest month at Mt Laguna #3, CA, averaging 83°F by day and 60°F at night; January is the coldest at 50°F and 33°F. A freezing night is all but certain in every month from December to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 76% of years and May still brings one in 36% of years.

Warmth for growing adds up to 2,908 growing degree days a year (base 50°F), fewer than at 86% of the 283 California stations. 30% of them (879) have built up by the end of June, and July adds the most, 656.

The nearest other station, Campo, CA, 10 miles south of Pine Valley and 3,290 feet lower, has a last frost 8 days later (April 30), a first frost 13 days earlier (October 26), a season 23 days shorter.

Measurable snow is rare here: only 4 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Campo, CA, 10.2 miles away, so there is no typical first-snow date to plan around.

ZIP 91962 is 8 miles from Mt Laguna #3, CA, which stands at 5,920 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 91962 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.