Frost Dates for 71639 — Dumas, Arkansas

Half of springs at Dumas, AR see their last 32°F night by March 12; only one in ten is past it by February 24, and one in ten still has one after March 29. Planting tender crops after March 20 leaves a 30% risk of a frost on them, after March 25 20%, and after March 29 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 41% of the 105 Arkansas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 14 in half of years, as early as October 30 one year in ten, and holds off past December 2 one year in ten. A hard freeze of 28°F follows 13 days later, around November 27; in spring the one-in-ten date for 28°F is March 19, 10 days before the 32°F one. The freeze-free season lasts 245 days in a typical year, longer than at 91% of the 105 Arkansas stations; it reaches 268 days one year in ten and falls short of 223 one year in ten. On average 42 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 3. Nights of 24°F, cold enough to damage hardier plants, come in 99% of winters and 16°F in 44%.

July is the warmest month at Dumas, AR, averaging 92°F by day and 72°F at night; January is the coldest at 53°F and 35°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From April to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 79% of years.

Warmth for growing adds up to 5,829 growing degree days a year (base 50°F), more than at 95% of the 105 Arkansas stations. 41% of them (2,400) have built up by the end of June, and July adds the most, 987. Precipitation totals 51.2 inches a year, most in April (5.5") and least in September (2.8"); May to September bring 34% of it.

The nearest other station, Cane Creek Sp, AR, 16 miles west of Dumas, has a last frost 3 days later (March 15), a first frost 3 days later (November 17), a season 1 day longer.

Measurable snow is rare here: only 6 of 24 winters from 1991 to 2020 recorded 0.1 inch or more at Dumas, AR, 2 miles away, so there is no typical first-snow date to plan around.

ZIP 71639 is 2 miles from Dumas, AR, which stands at 163 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 71639 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.