Frost Dates for 74857 — Newalla, Oklahoma

Half of springs at Shawnee 3NNW Mesonet, OK see their last 32°F night by March 30; only one in ten is past it by March 10, and one in ten still has one after April 16. Planting tender crops after April 5 leaves a 30% risk of a frost on them, after April 9 20%, and after April 16 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 20 one year in ten. A hard freeze of 28°F follows 9 days later, around November 14; in spring the one-in-ten date for 28°F is April 3, 13 days before the 32°F one. The freeze-free season lasts 221 days in a typical year, longer than at 80% of the 114 Oklahoma stations; it reaches 245 days one year in ten and falls short of 198 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 13 days longer, to about April 12, and return around October 28. Severe cold of 16°F or below comes in 93% of winters, usually between December 25 and February 8.

July is the warmest month at Shawnee 3NNW Mesonet, OK, averaging 93°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 45% of years.

Warmth for growing adds up to 5,151 growing degree days a year (base 50°F), more than at 52% of the 114 Oklahoma stations. 38% of them (1,952) have built up by the end of June, and July adds the most, 996.

The nearest other station, Spencer 2ENE Mesonet, OK, 16 miles northwest of Newalla, has a last frost 3 days later (April 2), the same first-frost date, a season 4 days shorter.

The first measurable snow (0.1 inch or more) in Newalla usually arrives around December 22, and the last of the season around February 5. Those are the middle dates across the winters of 1991–2020 at Shawnee, OK, 15.5 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 53 days after the last snow.

ZIP 74857 is 14 miles from Shawnee 3NNW Mesonet, OK, which stands at 1,076 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 74804 (Shawnee). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74857 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.