Frost Dates for 72519 — Calico Rock, Arkansas

Half of springs at Calico Rock 2 WSW, AR see their last 32°F night by April 14; only one in ten is past it by March 30, and one in ten still has one after April 29. Planting tender crops after April 20 leaves a 30% risk of a frost on them, after April 24 20%, and after April 29 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 86% of the 105 Arkansas stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 28 in half of years, as early as October 12 one year in ten, and holds off past November 8 one year in ten. A hard freeze of 28°F follows 8 days later, around November 5; in spring the one-in-ten date for 28°F is April 17, 12 days before the 32°F one. The freeze-free season lasts 196 days in a typical year, shorter than at 94% of the 105 Arkansas stations; it reaches 215 days one year in ten and falls short of 176 one year in ten. On average 100 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 11 days longer, to about April 25, and return around October 17. Severe cold of 16°F or below comes every winter, usually between December 14 and February 24.

July is the warmest month at Calico Rock 2 WSW, AR, averaging 88°F by day and 65°F at night; January is the coldest at 46°F and 25°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 85% of years.

Warmth for growing adds up to 4,023 growing degree days a year (base 50°F), fewer than at 96% of the 105 Arkansas stations. 37% of them (1,480) have built up by the end of June, and July adds the most, 820. Precipitation totals 48.9 inches a year, most in April (5.5") and least in February (3.3"); May to September bring 41% of it.

The nearest other station, Mountain Home 1 NNW, AR, 19 miles northwest of Calico Rock and 450 feet higher, has a last frost 14 days earlier (March 31), a first frost 4 days later (November 1), a season 18 days longer.

The first measurable snow (0.1 inch or more) in Calico Rock usually arrives around January 3, and the last of the season around February 15. Those are the middle dates across the winters of 1991–2020 at Calico Rock 2 WSW, AR, 1.6 miles away: half of years saw snow earlier, half later. Snow fell in 85% of those winters. The last 32°F night of spring typically comes 58 days after the last snow.

ZIP 72519 is 2 miles from Calico Rock 2 WSW, AR, which stands at 350 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 72556 (Melbourne). The 2023 USDA Plant Hardiness Zone Map lists ZIP 72519 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.