Frost Dates for 29847 — Trenton, South Carolina

Half of springs at Johnston 4 SW, SC see their last 32°F night by March 26; only one in ten is past it by March 6, and one in ten still has one after April 11. Planting tender crops after April 2 leaves a 30% risk of a frost on them, after April 6 20%, and after April 11 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 44% of the 105 South Carolina stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 8 in half of years, as early as October 25 one year in ten, and holds off past November 28 one year in ten. A hard freeze of 28°F follows 11 days later, around November 19; in spring the one-in-ten date for 28°F is March 31, 11 days before the 32°F one. The freeze-free season lasts 228 days in a typical year, shorter than at 55% of the 105 South Carolina stations; it reaches 254 days one year in ten and falls short of 203 one year in ten. On average 66 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 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 67%.

July is the warmest month at Johnston 4 SW, SC, averaging 93°F by day and 69°F at night; January is the coldest at 55°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 35% of years.

Warmth for growing adds up to 5,366 growing degree days a year (base 50°F), more than at 50% of the 105 South Carolina stations. 40% of them (2,133) have built up by the end of June, and July adds the most, 956. Precipitation totals 48.4 inches a year, most in June (5.1") and least in October (3.0"); May to September bring 45% of it.

The nearest other station, Edgefield 2.2 ENE, SC, 7 miles north of Trenton, has a last frost 10 days earlier (March 16), a first frost 5 days later (November 13), a season 16 days longer.

Measurable snow is rare here: only 10 of 25 winters from 1991 to 2020 recorded 0.1 inch or more at Johnston 4 SW, SC, 5.5 miles away, so there is no typical first-snow date to plan around.

ZIP 29847 is 6 miles from Johnston 4 SW, SC, which stands at 629 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 29832 (Johnston). The 2023 USDA Plant Hardiness Zone Map lists ZIP 29847 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.