Frost Dates for 30040 — Cumming, Georgia

Half of springs at Cumming 2N, GA see their last 32°F night by April 4; only one in ten is past it by March 16, and one in ten still has one after April 19. Planting tender crops after April 10 leaves a 30% risk of a frost on them, after April 14 20%, and after April 19 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 83% of the 127 Georgia stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 4 in half of years, as early as October 23 one year in ten, and holds off past November 23 one year in ten. A hard freeze of 28°F follows 11 days later, around November 15; in spring the one-in-ten date for 28°F is April 7, 12 days before the 32°F one. The freeze-free season lasts 214 days in a typical year, shorter than at 85% of the 127 Georgia stations; it reaches 241 days one year in ten and falls short of 194 one year in ten. On average 67 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 16, and return around October 25. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 82%.

July is the warmest month at Cumming 2N, GA, averaging 89°F by day and 67°F at night; January is the coldest at 51°F and 31°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 63% of years.

Warmth for growing adds up to 4,626 growing degree days a year (base 50°F), fewer than at 84% of the 127 Georgia stations. 38% of them (1,768) have built up by the end of June, and July adds the most, 871. Precipitation totals 56.4 inches a year, most in January (5.4") and least in September (4.0"); May to September bring 40% of it.

The nearest other station, Gainesville, GA, 19 miles east of Cumming, has a last frost 8 days earlier (March 27), a first frost 8 days later (November 12), a season 17 days longer.

Measurable snow is rare here: only 7 of 22 winters from 1991 to 2020 recorded 0.1 inch or more at Cumming 2N, GA, 2.7 miles away, so there is no typical first-snow date to plan around.

ZIP 30040 is 3 miles from Cumming 2N, GA, which stands at 1,140 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 9 other ZIP codes share the station; its figures are presented in full for 30043 (Lawrenceville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 30040 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.