Frost Dates for 73020 — Choctaw, Oklahoma

Half of springs at Spencer 2ENE Mesonet, 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 18. Planting tender crops after April 8 leaves a 30% risk of a frost on them, after April 13 20%, and after April 18 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 61% 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 20 one year in ten, and holds off past November 20 one year in ten. A hard freeze of 28°F follows 8 days later, around November 13; in spring the one-in-ten date for 28°F is April 6, 12 days before the 32°F one. The freeze-free season lasts 217 days in a typical year, longer than at 70% of the 114 Oklahoma stations; it reaches 243 days one year in ten and falls short of 194 one year in ten. On average 68 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 10 days longer, to about April 12, and return around October 28. Severe cold of 16°F or below comes in 96% of winters, usually between December 24 and February 9.

July is the warmest month at Spencer 2ENE Mesonet, OK, averaging 92°F by day and 72°F at night; January is the coldest at 50°F and 29°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 5,172 growing degree days a year (base 50°F), more than at 57% of the 114 Oklahoma stations. 38% of them (1,975) have built up by the end of June, and July adds the most, 993.

The nearest other station, Meeker 5 W, OK, 17 miles east of Choctaw and 298 feet lower, has a last frost 2 days later (April 4), a first frost 6 days earlier (October 30), a season 9 days shorter.

The first measurable snow (0.1 inch or more) in Choctaw usually arrives around January 7, and the last of the season around January 29. Those are the middle dates across the winters of 1991–2020 at Meeker 5 W, OK, 16.5 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 63 days after the last snow.

ZIP 73020 is 7 miles from Spencer 2ENE Mesonet, OK, which stands at 1,223 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 16 other ZIP codes share the station; its figures are presented in full for 73013 (Edmond). The 2023 USDA Plant Hardiness Zone Map lists ZIP 73020 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.