Frost Dates for 35643 — Hillsboro, Alabama

Half of springs at Courtland 2 WSW, AL see their last 32°F night by March 28; only one in ten is past it by March 8, and one in ten still has one after April 13. Planting tender crops after April 3 leaves a 30% risk of a frost on them, after April 7 20%, and after April 13 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 80% of the 115 Alabama stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 3 in half of years, as early as October 22 one year in ten, and holds off past November 18 one year in ten. A hard freeze of 28°F follows 11 days later, around November 14; in spring the one-in-ten date for 28°F is April 2, 11 days before the 32°F one. The freeze-free season lasts 221 days in a typical year, shorter than at 70% of the 115 Alabama stations; it reaches 246 days one year in ten and falls short of 199 one year in ten. On average 64 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 9, and return around October 25. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 84%.

July is the warmest month at Courtland 2 WSW, AL, averaging 89°F by day and 70°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 41% of years.

Warmth for growing adds up to 4,915 growing degree days a year (base 50°F), fewer than at 83% of the 115 Alabama stations. 39% of them (1,939) have built up by the end of June, and July adds the most, 913. Precipitation totals 56.2 inches a year, most in February (5.5") and least in August (3.7"); May to September bring 39% of it.

The nearest other station, Moulton 2, AL, 12 miles southwest of Hillsboro, has a last frost 5 days later (April 2), a first frost 3 days earlier (October 31), a season 12 days shorter.

Measurable snow is rare here: only 10 of 23 winters from 1991 to 2020 recorded 0.1 inch or more at Athens, AL, 16.8 miles away, so there is no typical first-snow date to plan around.

ZIP 35643 is 8 miles from Courtland 2 WSW, AL, which stands at 575 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 35672 (Town Creek). The 2023 USDA Plant Hardiness Zone Map lists ZIP 35643 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.