Frost Dates for 73018 — Chickasha, Oklahoma

Half of springs at Chickasha Exp Station, OK see their last 32°F night by April 4; only one in ten is past it by March 20, and one in ten still has one after April 20. Planting tender crops after April 10 leaves a 30% risk of a frost on them, after April 14 20%, and after April 20 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 1 in half of years, as early as October 18 one year in ten, and holds off past November 15 one year in ten. A hard freeze of 28°F follows 7 days later, around November 8; in spring the one-in-ten date for 28°F is April 8, 12 days before the 32°F one. The freeze-free season lasts 211 days in a typical year, longer than at 51% of the 114 Oklahoma stations; it reaches 233 days one year in ten and falls short of 190 one year in ten. On average 79 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 14, and return around October 23. Severe cold of 16°F or below comes in 99% of winters, usually between December 14 and February 15.

July is the warmest month at Chickasha Exp Station, OK, averaging 97°F by day and 71°F at night; January is the coldest at 54°F and 27°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 63% of years.

Warmth for growing adds up to 5,552 growing degree days a year (base 50°F), more than at 92% of the 114 Oklahoma stations. 39% of them (2,149) have built up by the end of June, and July adds the most, 1,049. Precipitation totals 36.7 inches a year, most in May (5.0") and least in January (1.4"); May to September bring 53% of it.

The nearest other station, Anadarko 3 E, OK, 14 miles west of Chickasha, has a last frost 4 days later (April 8), a first frost 2 days earlier (October 30), a season 9 days shorter.

The first measurable snow (0.1 inch or more) in Chickasha usually arrives around December 20, and the last of the season around January 31. Those are the middle dates across the winters of 1991–2020 at Chickasha Exp Station, OK, 1.9 miles away: half of years saw snow earlier, half later. Snow fell in 76% of those winters. The last 32°F night of spring typically comes 63 days after the last snow.

ZIP 73018 is 2 miles from Chickasha Exp Station, OK, which stands at 1,085 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73018 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.