Frost Dates for 35175 — Union Grove, Alabama

Half of springs at Owens Cross Roads 3S, AL see their last 32°F night by April 4; only one in ten is past it by March 18, and one in ten still has one after April 20. Planting tender crops after April 10 leaves a 30% risk of a frost on them, after April 14 20%, and after April 20 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 October 30 in half of years, as early as October 17 one year in ten, and holds off past November 13 one year in ten. A hard freeze of 28°F follows 9 days later, around November 8; in spring the one-in-ten date for 28°F is April 9, 11 days before the 32°F one. The freeze-free season lasts 210 days in a typical year, shorter than at 85% of the 115 Alabama stations; it reaches 229 days one year in ten and falls short of 189 one year in ten. On average 78 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 16, and return around October 22. Severe cold of 16°F or below comes in 91% of winters, usually between January 1 and February 4.

July is the warmest month at Owens Cross Roads 3S, AL, averaging 88°F by day and 68°F at night; January is the coldest at 50°F and 30°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 61% of years.

Warmth for growing adds up to 4,600 growing degree days a year (base 50°F), fewer than at 95% of the 115 Alabama stations. 38% of them (1,756) have built up by the end of June, and July adds the most, 873. Precipitation totals 58.0 inches a year, most in December (6.2") and least in August (3.7"); May to September bring 37% of it.

The nearest other station, Guntersville, AL, 13 miles southeast of Union Grove, has a last frost 16 days earlier (March 19), a first frost 19 days later (November 18), a season 34 days longer.

Measurable snow is rare here: only 5 of 23 winters from 1991 to 2020 recorded 0.1 inch or more at Guntersville, AL, 12.5 miles away, so there is no typical first-snow date to plan around.

ZIP 35175 is 10 miles from Owens Cross Roads 3S, AL, which stands at 590 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 9 other ZIP codes share the station; its figures are presented in full for 35811 (Huntsville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 35175 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.