Frost Dates for 74735 — Fort Towson, Oklahoma

Half of springs at Hugo, OK see their last 32°F night by March 15; only one in ten is past it by February 25, and one in ten still has one after April 4. Planting tender crops after March 24 leaves a 30% risk of a frost on them, after March 29 20%, and after April 4 10%. The 20 days between the even-odds date and the one-in-ten date is wider than at 92% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 15 in half of years, as early as October 29 one year in ten, and holds off past December 3 one year in ten. A hard freeze of 28°F follows 15 days later, around November 30; in spring the one-in-ten date for 28°F is March 22, 13 days before the 32°F one. The freeze-free season lasts 244 days in a typical year, the longest of the 114 Oklahoma stations; it reaches 272 days one year in ten and falls short of 216 one year in ten. On average 52 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 16 days longer, to about March 31, and return around November 4. Nights of 24°F, cold enough to damage hardier plants, come in 99% of winters and 16°F in 53%.

July is the warmest month at Hugo, OK, averaging 93°F by day and 71°F at night; January is the coldest at 54°F and 32°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 81% of years and April still brings one in 15% of years.

Warmth for growing adds up to 5,725 growing degree days a year (base 50°F), more than at 97% of the 114 Oklahoma stations. 39% of them (2,254) have built up by the end of June, and July adds the most, 1,000.

The nearest other station, Antlers, OK, 24 miles northwest of Fort Towson, has a last frost 19 days later (April 3), a first frost 14 days earlier (November 1), a season 31 days shorter.

Measurable snow is rare here: only 9 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Valliant 3 W, OK, 7.5 miles away, so there is no typical first-snow date to plan around.

ZIP 74735 is 16 miles from Hugo, OK, which stands at 520 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 74743 (Hugo). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74735 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.