Frost Dates for 74081 — Terlton, Oklahoma

Half of springs at Mannford 6 NW, OK see their last 32°F night by April 6; only one in ten is past it by March 19, and one in ten still has one after April 23. Planting tender crops after April 13 leaves a 30% risk of a frost on them, after April 17 20%, and after April 23 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 41% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 29 in half of years, as early as October 14 one year in ten, and holds off past November 13 one year in ten. A hard freeze of 28°F follows 9 days later, around November 7; in spring the one-in-ten date for 28°F is April 11, 12 days before the 32°F one. The freeze-free season lasts 207 days in a typical year, shorter than at 68% of the 114 Oklahoma stations; it reaches 230 days one year in ten and falls short of 182 one year in ten. On average 77 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 12 days longer, to about April 18, and return around October 20. Severe cold of 16°F or below comes every winter, usually between December 13 and February 20.

July is the warmest month at Mannford 6 NW, OK, averaging 93°F by day and 71°F at night; January is the coldest at 50°F and 28°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 65% of years.

Warmth for growing adds up to 5,161 growing degree days a year (base 50°F), more than at 54% of the 114 Oklahoma stations. 38% of them (1,980) have built up by the end of June, and July adds the most, 989. Precipitation totals 41.9 inches a year, most in May (6.0") and least in February (1.7"); May to September bring 54% of it.

The nearest other station, Cushing, OK, 23 miles southwest of Terlton, has a last frost 5 days earlier (April 1), a first frost 7 days later (November 5), a season 10 days longer.

The first measurable snow (0.1 inch or more) in Terlton usually arrives around December 21, and the last of the season around February 15. Those are the middle dates across the winters of 1991–2020 at Mannford 6 NW, OK, 0.4 miles away: half of years saw snow earlier, half later. Snow fell in 95% of those winters. The last 32°F night of spring typically comes 50 days after the last snow.

ZIP 74081 is under a mile from Mannford 6 NW, OK, which stands at 830 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 74044 (Mannford). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74081 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.