Frost Dates for 74578 — Wilburton, Oklahoma

Half of springs at Wilburton 9 ENE, OK see their last 32°F night by April 2; only one in ten is past it by March 12, and one in ten still has one after April 19. Planting tender crops after April 9 leaves a 30% risk of a frost on them, after April 13 20%, and after April 19 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 November 5 in half of years, as early as October 22 one year in ten, and holds off past November 21 one year in ten. A hard freeze of 28°F follows 10 days later, around November 15; in spring the one-in-ten date for 28°F is April 7, 12 days before the 32°F one. The freeze-free season lasts 218 days in a typical year, longer than at 74% of the 114 Oklahoma stations; it reaches 243 days one year in ten and falls short of 194 one year in ten. On average 71 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 14, and return around October 28. Severe cold of 16°F or below comes in 90% of winters, usually between December 30 and February 1.

July is the warmest month at Wilburton 9 ENE, OK, averaging 94°F by day and 70°F at night; January is the coldest at 52°F and 30°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 55% of years.

Warmth for growing adds up to 5,281 growing degree days a year (base 50°F), more than at 71% of the 114 Oklahoma stations. 38% of them (2,020) have built up by the end of June, and July adds the most, 985. Precipitation totals 50.9 inches a year, most in May (7.4") and least in July (2.7"); May to September bring 46% of it.

The nearest other station, Tuskahoma, OK, 19 miles south of Wilburton, has a last frost 9 days later (April 11), a first frost 9 days earlier (October 27), a season 19 days shorter.

Measurable snow is rare here: only 5 of 19 winters from 1991 to 2020 recorded 0.1 inch or more at Clayton 14 WNW, OK, 22.4 miles away, so there is no typical first-snow date to plan around.

ZIP 74578 is 9 miles from Wilburton 9 ENE, OK, which stands at 635 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 74578 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.