Frost Dates for 72360 — Marianna, Arkansas

Half of springs at Marianna 2 S, AR see their last 32°F night by March 18; only one in ten is past it by March 1, and one in ten still has one after April 5. Planting tender crops after March 26 leaves a 30% risk of a frost on them, after March 31 20%, and after April 5 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 60% of the 105 Arkansas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 11 in half of years, as early as October 28 one year in ten, and holds off past December 1 one year in ten. A hard freeze of 28°F follows 15 days later, around November 26; in spring the one-in-ten date for 28°F is March 22, 14 days before the 32°F one. The freeze-free season lasts 238 days in a typical year, longer than at 80% of the 105 Arkansas stations; it reaches 263 days one year in ten and falls short of 214 one year in ten. On average 55 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 31, and return around November 1. Nights of 24°F, cold enough to damage hardier plants, come in 99% of winters and 16°F in 68%.

July is the warmest month at Marianna 2 S, AR, averaging 91°F by day and 72°F at night; January is the coldest at 49°F and 32°F. A freezing night is all but certain in every month from December 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 19% of years.

Warmth for growing adds up to 5,410 growing degree days a year (base 50°F), more than at 73% of the 105 Arkansas stations. 40% of them (2,156) have built up by the end of June, and July adds the most, 967. Precipitation totals 52.1 inches a year, most in March (5.7") and least in August (2.8"); May to September bring 36% of it.

The nearest other station, Helena, AR, 20 miles southeast of Marianna, has a last frost 3 days earlier (March 15), a first frost 5 days later (November 16), a season 8 days longer.

The first measurable snow (0.1 inch or more) in Marianna usually arrives around January 23, and the last of the season around February 2. Those are the middle dates across the winters of 1991–2020 at Marianna 2 S, AR, 1.9 miles away: half of years saw snow earlier, half later. Snow fell in 60% of those winters. The last 32°F night of spring typically comes 44 days after the last snow.

ZIP 72360 is 2 miles from Marianna 2 S, AR, which stands at 234 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 72360 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.