Frost Dates for 73443 — Lone Grove, Oklahoma

Half of springs at Ardmore 7WNW Mesonet, OK see their last 32°F night by March 21; only one in ten is past it by March 3, and one in ten still has one after April 10. Planting tender crops after March 30 leaves a 30% risk of a frost on them, after April 3 20%, and after April 10 10%. The 20 days between the even-odds date and the one-in-ten date is wider than at 92% 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 24 one year in ten, and holds off past November 28 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 27, 14 days before the 32°F one. The freeze-free season lasts 231 days in a typical year, longer than at 96% of the 114 Oklahoma stations; it reaches 259 days one year in ten and falls short of 205 one year in ten. On average 56 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 15 days longer, to about April 5, and return around November 1. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 79%.

July is the warmest month at Ardmore 7WNW Mesonet, OK, averaging 94°F by day and 72°F at night; January is the coldest at 53°F and 31°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 27% of years.

Warmth for growing adds up to 5,650 growing degree days a year (base 50°F), more than at 95% of the 114 Oklahoma stations. 39% of them (2,214) have built up by the end of June, and July adds the most, 1,021.

The nearest other station, Ardmore, OK, 7 miles east of Lone Grove, has a last frost 6 days earlier (March 15), a first frost 6 days later (November 14), a season 13 days longer.

The first measurable snow (0.1 inch or more) in Lone Grove 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, 8.5 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 35 days after the last snow.

ZIP 73443 is 6 miles from Ardmore 7WNW Mesonet, OK, which stands at 928 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73443 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.