Frost Dates for 73438 — Healdton, Oklahoma

Half of springs at Healdton 3 E, OK see their last 32°F night by April 6; only one in ten is past it by March 20, and one in ten still has one after April 25. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 20 20%, and after April 25 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 81% 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 15 one year in ten, and holds off past November 14 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 15, 10 days before the 32°F one. The freeze-free season lasts 204 days in a typical year, shorter than at 78% of the 114 Oklahoma stations; it reaches 228 days one year in ten and falls short of 180 one year in ten. On average 74 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 14 days longer, to about April 20, and return around October 21. Severe cold of 16°F or below comes in 98% of winters, usually between December 13 and February 17.

July is the warmest month at Healdton 3 E, OK, averaging 95°F by day and 69°F at night; January is the coldest at 53°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 66% of years.

Warmth for growing adds up to 5,225 growing degree days a year (base 50°F), more than at 62% of the 114 Oklahoma stations. 38% of them (1,985) have built up by the end of June, and July adds the most, 994. Precipitation totals 37.2 inches a year, most in May (5.2") and least in January (1.8"); May to September bring 49% of it.

The nearest other station, Ardmore 7WNW Mesonet, OK, 16 miles east of Healdton, has a last frost 16 days earlier (March 21), a first frost 7 days later (November 8), a season 27 days longer.

The first measurable snow (0.1 inch or more) in Healdton usually arrives around December 23, and the last of the season around February 14. Those are the middle dates across the winters of 1991–2020 at Healdton 3 E, OK, 3.9 miles away: half of years saw snow earlier, half later. Snow fell in 75% of those winters. The last 32°F night of spring typically comes 51 days after the last snow.

ZIP 73438 is 4 miles from Healdton 3 E, OK, which stands at 902 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 73463 (Wilson). The 2023 USDA Plant Hardiness Zone Map lists ZIP 73438 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.