Frost Dates for 31305 — Darien, Georgia

Half of springs at Sapelo Is, GA see their last 32°F night by February 20; only one in ten is past it by January 25, and one in ten still has one after March 16. Planting tender crops after March 2 leaves a 30% risk of a frost on them, after March 6 20%, and after March 16 10%. The 24 days between the even-odds date and the one-in-ten date is wider than at 98% of the 127 Georgia 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 19 in half of years, as early as November 23 one year in ten, and holds off past January 15 one year in ten. A hard freeze of 28°F follows 15 days later, around January 3; in spring the one-in-ten date for 28°F is March 3, 13 days before the 32°F one. The freeze-free season lasts 298 days in a typical year, longer than at 98% of the 127 Georgia stations; it reaches 332 days one year in ten and falls short of 266 one year in ten. On average 12 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 14 days longer, to about March 6, and return around November 29. Nights of 24°F, cold enough to damage hardier plants, come in 50% of winters and 16°F in 2%.

July is the warmest month at Sapelo Is, GA, averaging 91°F by day and 75°F at night; January is the coldest at 62°F and 43°F. From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 74% of years and March still brings one in 32% of years.

Warmth for growing adds up to 6,930 growing degree days a year (base 50°F), more than at 97% of the 127 Georgia stations. 41% of them (2,857) have built up by the end of June, and July adds the most, 1,025. Precipitation totals 50.0 inches a year, most in August (6.7") and least in November (2.3"); May to September bring 53% of it.

The nearest other station, Brunswick Malcolm Mckinnon Airport, GA, 18 miles south of Darien, has a last frost 11 days earlier (February 9), a first frost 7 days later (December 26), a season 14 days longer.

Measurable snow is rare here: only 0 of 30 winters from 1991 to 2020 recorded 0.1 inch or more at Sapelo Is, GA, 6.5 miles away, so there is no typical first-snow date to plan around.

ZIP 31305 is 7 miles from Sapelo Is, GA, which stands at 10 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 31331 (Townsend). The 2023 USDA Plant Hardiness Zone Map lists ZIP 31305 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.