Frost Dates for 95209 — Stockton, California

Half of springs at Stockton Fire Stn 4, CA see their last 32°F night by February 5; only one in ten is past it by December 27, and one in ten still has one after March 11. Planting tender crops after February 19 leaves a 30% risk of a frost on them, after February 28 20%, and after March 11 10%. 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 8 in half of years, as early as November 17 one year in ten, and holds off past January 6 one year in ten. A hard freeze of 28°F follows 15 days later, around December 23; in spring the one-in-ten date for 28°F is February 21, 18 days before the 32°F one. The freeze-free season lasts 305 days in a typical year, longer than at 67% of the 219 California stations; it reaches 344 days one year in ten and falls short of 262 one year in ten. On average 25 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 27 days longer, to about March 4, and return around November 20. A 24°F night is unusual: 13% of winters had one.

July is the warmest month at Stockton Fire Stn 4, CA, averaging 95°F by day and 61°F at night; January is the coldest at 58°F and 39°F. From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 45% of years and March still brings one in 15% of years.

Warmth for growing adds up to 5,277 growing degree days a year (base 50°F), more than at 73% of the 283 California stations. 39% of them (2,078) have built up by the end of June, and July adds the most, 863. Precipitation totals 17.4 inches a year, most in January (3.6") and least in July (0.0"); May to September bring 5% of it.

The nearest other station, Lodi, CA, 6 miles northeast of Stockton, has a last frost 4 days later (February 9), a first frost 3 days earlier (December 5), a season 4 days shorter.

Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Stockton Fire Stn 4, CA, 2.9 miles away, so there is no typical first-snow date to plan around.

ZIP 95209 is 3 miles from Stockton Fire Stn 4, CA, which stands at 12 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 8 other ZIP codes share the station; its figures are presented in full for 95207 (Stockton). The 2023 USDA Plant Hardiness Zone Map lists ZIP 95209 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.