Frost Dates for 73439 — Kingston, Oklahoma

Half of springs at Madill, OK see their last 32°F night by March 27; only one in ten is past it by March 7, and one in ten still has one after April 14. Planting tender crops after April 2 leaves a 30% risk of a frost on them, after April 6 20%, and after April 14 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 60% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 8 in half of years, as early as October 25 one year in ten, and holds off past November 25 one year in ten. A hard freeze of 28°F follows 11 days later, around November 19; in spring the one-in-ten date for 28°F is March 30, 15 days before the 32°F one. The freeze-free season lasts 227 days in a typical year, longer than at 91% of the 114 Oklahoma stations; it reaches 253 days one year in ten and falls short of 202 one year in ten. On average 63 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 8, and return around October 31. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 84%.

July is the warmest month at Madill, OK, averaging 95°F by day and 73°F at night; January is the coldest at 53°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 35% of years.

Warmth for growing adds up to 5,668 growing degree days a year (base 50°F), more than at 96% of the 114 Oklahoma stations. 38% of them (2,175) have built up by the end of June, and July adds the most, 1,054. Precipitation totals 41.4 inches a year, most in May (5.6") and least in January (2.2"); May to September bring 48% of it.

The nearest other station, Sherman, TX, 17 miles south of Kingston, has a last frost 13 days earlier (March 14), a first frost 11 days later (November 19), a season 23 days longer.

The first measurable snow (0.1 inch or more) in Kingston usually arrives around January 18, and the last of the season around January 27. Those are the middle dates across the winters of 1991–2020 at Kingston 5 SSE, OK, 1.1 miles away: half of years saw snow earlier, half later. Snow fell in 72% of those winters. The last 32°F night of spring typically comes 59 days after the last snow.

ZIP 73439 is 11 miles from Madill, OK, which stands at 770 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 73446 (Madill). The 2023 USDA Plant Hardiness Zone Map lists ZIP 73439 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.