Frost Dates for 30739 — Rock Spring, Georgia

Half of springs at Chickamauga 2 SW, GA see their last 32°F night by March 25; only one in ten is past it by March 4, and one in ten still has one after April 11. Planting tender crops after April 1 leaves a 30% risk of a frost on them, after April 5 20%, and after April 11 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 56% of the 127 Georgia stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 9 in half of years, as early as October 28 one year in ten, and holds off past December 1 one year in ten. A hard freeze of 28°F follows 16 days later, around November 25; in spring the one-in-ten date for 28°F is March 31, 11 days before the 32°F one. The freeze-free season lasts 232 days in a typical year, shorter than at 56% of the 127 Georgia stations; it reaches 259 days one year in ten and falls short of 207 one year in ten. On average 76 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 13 days longer, to about April 7, and return around October 30. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 66%.

July is the warmest month at Chickamauga 2 SW, GA, averaging 89°F by day and 70°F at night; January is the coldest at 51°F and 33°F. A freezing night is all but certain in every month from December 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 89% of years and April still brings one in 32% of years.

Warmth for growing adds up to 4,986 growing degree days a year (base 50°F), fewer than at 72% of the 127 Georgia stations. 39% of them (1,935) have built up by the end of June, and July adds the most, 907. Precipitation totals 57.0 inches a year, most in December (5.9") and least in October (3.3"); May to September bring 37% of it.

The nearest other station, Chickamauga Pk Larc, GA, 9 miles north of Rock Spring, has a last frost 12 days later (April 6), a first frost 10 days earlier (October 30), a season 27 days shorter.

Measurable snow is rare here: only 0 of 17 winters from 1991 to 2020 recorded 0.1 inch or more at Chickamauga Park, GA, 7.4 miles away, so there is no typical first-snow date to plan around.

ZIP 30739 is 6 miles from Chickamauga 2 SW, GA, which stands at 799 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 30728 (La Fayette). The 2023 USDA Plant Hardiness Zone Map lists ZIP 30739 in zone 8a, the band where the coldest night of the year averaged 10 to 15°F (-12.2 to -9.4°C) over 1991–2020; a zone describes winter lows, not frost dates.