Frost Dates for 30141 — Hiram, Georgia

Half of springs at Dallas 7 NE, GA see their last 32°F night by April 2; only one in ten is past it by March 15, and one in ten still has one after April 19. Planting tender crops after April 9 leaves a 30% risk of a frost on them, after April 13 20%, and after April 19 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 4 in half of years, as early as October 23 one year in ten, and holds off past November 20 one year in ten. A hard freeze of 28°F follows 13 days later, around November 17; 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 218 days in a typical year, shorter than at 79% of the 127 Georgia stations; it reaches 244 days one year in ten and falls short of 196 one year in ten. On average 73 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 April 16, and return around October 26. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 83%.

July is the warmest month at Dallas 7 NE, GA, averaging 90°F by day and 68°F at night; January is the coldest at 53°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 53% of years.

Warmth for growing adds up to 4,990 growing degree days a year (base 50°F), fewer than at 71% of the 127 Georgia stations. 39% of them (1,946) have built up by the end of June, and July adds the most, 905. Precipitation totals 54.3 inches a year, most in February (5.1") and least in October (3.4"); May to September bring 41% of it.

The nearest other station, Mableton 1 N, GA, 11 miles east of Hiram, has a last frost 6 days earlier (March 27), a first frost 3 days later (November 7), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Hiram usually arrives around January 18, and the last of the season around February 11. Those are the middle dates across the winters of 1991–2020 at Dallas 7 NE, GA, 9.1 miles away: half of years saw snow earlier, half later. Snow fell in 92% of those winters. The last 32°F night of spring typically comes 50 days after the last snow.

ZIP 30141 is 9 miles from Dallas 7 NE, GA, which stands at 1,028 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 30101 (Acworth). The 2023 USDA Plant Hardiness Zone Map lists ZIP 30141 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.