Frost Dates for 29440 — Georgetown, South Carolina

Half of springs at Georgetown Co Airport, SC see their last 32°F night by March 12; only one in ten is past it by February 18, and one in ten still has one after March 30. Planting tender crops after March 20 leaves a 30% risk of a frost on them, after March 24 20%, and after March 30 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 77% of the 105 South Carolina stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 24 in half of years, as early as November 6 one year in ten, and holds off past December 19 one year in ten. A hard freeze of 28°F follows 16 days later, around December 10; in spring the one-in-ten date for 28°F is March 19, 11 days before the 32°F one. The freeze-free season lasts 258 days in a typical year, longer than at 90% of the 105 South Carolina stations; it reaches 291 days one year in ten and falls short of 231 one year in ten. On average 33 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 March 25, and return around November 10. Nights of 24°F, cold enough to damage hardier plants, come in 89% of winters and 16°F in 18%.

July is the warmest month at Georgetown Co Airport, SC, averaging 91°F by day and 73°F at night; January is the coldest at 59°F and 37°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 72% of years.

Warmth for growing adds up to 5,993 growing degree days a year (base 50°F), more than at 86% of the 105 South Carolina stations. 40% of them (2,387) have built up by the end of June, and July adds the most, 986.

The nearest other station, Andrews, SC, 14 miles west of Georgetown, has a last frost 11 days later (March 23), a first frost 11 days earlier (November 13), a season 21 days shorter.

Measurable snow is rare here: only 2 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Andrews, SC, 14.3 miles away, so there is no typical first-snow date to plan around.

ZIP 29440 is 5 miles from Georgetown Co Airport, SC, which stands at 30 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 29440 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°C) over 1991–2020; a zone describes winter lows, not frost dates.