Frost Dates for 30064 — Marietta, Georgia

Half of springs at Mableton 1 N, GA see their last 32°F night by March 27; only one in ten is past it by March 9, and one in ten still has one after April 12. Planting tender crops after April 3 leaves a 30% risk of a frost on them, after April 7 20%, and after April 12 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 70% of the 127 Georgia stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 7 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 12 days later, around November 19; in spring the one-in-ten date for 28°F is March 31, 12 days before the 32°F one. The freeze-free season lasts 225 days in a typical year, shorter than at 68% of the 127 Georgia stations; it reaches 249 days one year in ten and falls short of 205 one year in ten. On average 64 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 12 days longer, to about April 8, and return around October 30. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 75%.

July is the warmest month at Mableton 1 N, GA, averaging 84°F by day and 68°F at night; January is the coldest at 53°F and 32°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 38% of years.

Warmth for growing adds up to 4,519 growing degree days a year (base 50°F), fewer than at 89% of the 127 Georgia stations. 40% of them (1,786) have built up by the end of June, and July adds the most, 809. Precipitation totals 56.1 inches a year, most in July (7.0") and least in September (3.7"); May to September bring 42% of it.

The nearest other station, Dallas 7 NE, GA, 9 miles northwest of Marietta, has a last frost 6 days later (April 2), a first frost 3 days earlier (November 4), a season 7 days shorter.

Measurable snow is rare here: only 4 of 23 winters from 1991 to 2020 recorded 0.1 inch or more at Atlanta 9NW, GA, 10.3 miles away, so there is no typical first-snow date to plan around.

ZIP 30064 is 7 miles from Mableton 1 N, GA, which stands at 980 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 14 other ZIP codes share the station; its figures are presented in full for 30127 (Powder Springs). The 2023 USDA Plant Hardiness Zone Map lists ZIP 30064 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.