Frost Dates for 30047 — Lilburn, Georgia

Half of springs at Atlanta Peachtree Airport, GA see their last 32°F night by March 25; only one in ten is past it by March 5, and one in ten still has one after April 12. Planting tender crops after April 1 leaves a 30% risk of a frost on them, after April 5 20%, and after April 12 10%. The 18 days between the even-odds date and the one-in-ten date is narrower than at 41% 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 26 one year in ten, and holds off past November 27 one year in ten. A hard freeze of 28°F follows 13 days later, around November 22; 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 228 days in a typical year, shorter than at 61% of the 127 Georgia stations; it reaches 253 days one year in ten and falls short of 205 one year in ten. On average 49 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 29. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 71%.

July is the warmest month at Atlanta Peachtree Airport, GA, averaging 89°F by day and 70°F at night; January is the coldest at 52°F and 33°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 32% of years.

Warmth for growing adds up to 5,025 growing degree days a year (base 50°F), fewer than at 69% of the 127 Georgia stations. 39% of them (1,985) have built up by the end of June, and July adds the most, 919. Precipitation totals 51.5 inches a year, most in March (4.7") and least in October (3.4"); May to September bring 42% of it.

The nearest other station, Winder 4S, GA, 23 miles east of Lilburn, has a last frost 9 days later (April 3), a first frost 2 days earlier (November 7), a season 9 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, 22 miles away, so there is no typical first-snow date to plan around.

ZIP 30047 is 11 miles from Atlanta Peachtree Airport, GA, which stands at 1,002 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 45 other ZIP codes share the station; its figures are presented in full for 30044 (Lawrenceville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 30047 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.