Frost Dates for 72761 — Siloam Springs, Arkansas

Half of springs at Fayetteville NW Ar Airport, AR see their last 32°F night by April 8; only one in ten is past it by March 21, and one in ten still has one after April 26. Planting tender crops after April 16 leaves a 30% risk of a frost on them, after April 21 20%, and after April 26 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 October 28 in half of years, as early as October 14 one year in ten, and holds off past November 12 one year in ten. A hard freeze of 28°F follows 10 days later, around November 7; in spring the one-in-ten date for 28°F is April 12, 14 days before the 32°F one. The freeze-free season lasts 203 days in a typical year, shorter than at 88% of the 105 Arkansas stations; it reaches 226 days one year in ten and falls short of 181 one year in ten. On average 92 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 14 days longer, to about April 22, and return around October 19. Severe cold of 16°F or below comes every winter, usually between December 14 and February 20.

July is the warmest month at Fayetteville NW Ar Airport, AR, averaging 90°F by day and 69°F at night; January is the coldest at 48°F and 27°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 71% of years.

Warmth for growing adds up to 4,540 growing degree days a year (base 50°F), fewer than at 82% of the 105 Arkansas stations. 37% of them (1,699) have built up by the end of June, and July adds the most, 911. Precipitation totals 45.4 inches a year, most in May (5.9") and least in February (2.2"); May to September bring 48% of it.

The nearest other station, Kansas 2 NE, OK, 16 miles west of Siloam Springs, has a last frost 8 days earlier (March 31), a first frost 5 days later (November 2), a season 13 days longer.

The first measurable snow (0.1 inch or more) in Siloam Springs usually arrives around December 17, and the last of the season around February 28. Those are the middle dates across the winters of 1991–2020 at Gravette, AR, 17.3 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 39 days after the last snow.

ZIP 72761 is 13 miles from Fayetteville NW Ar Airport, AR, which stands at 1,287 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 72761 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.