Frost Dates for 74728 — Broken Bow, Oklahoma

Half of springs at Broken Bow 1 N, OK see their last 32°F night by April 1; only one in ten is past it by March 10, and one in ten still has one after April 17. Planting tender crops after April 7 leaves a 30% risk of a frost on them, after April 11 20%, and after April 17 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 2 in half of years, as early as October 20 one year in ten, and holds off past November 19 one year in ten. A hard freeze of 28°F follows 12 days later, around November 14; in spring the one-in-ten date for 28°F is April 3, 14 days before the 32°F one. The freeze-free season lasts 220 days in a typical year, longer than at 77% of the 114 Oklahoma stations; it reaches 244 days one year in ten and falls short of 196 one year in ten. On average 66 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 12 days longer, to about April 13, and return around October 25. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 87%.

July is the warmest month at Broken Bow 1 N, OK, averaging 93°F by day and 69°F at night; January is the coldest at 53°F and 28°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 51% of years.

Warmth for growing adds up to 5,211 growing degree days a year (base 50°F), more than at 61% of the 114 Oklahoma stations. 38% of them (1,989) have built up by the end of June, and July adds the most, 959. Precipitation totals 55.0 inches a year, most in May (6.3") and least in August (3.2"); May to September bring 40% of it.

The nearest other station, Idabel, OK, 15 miles south of Broken Bow, has a last frost 1 day earlier (March 31), a first frost 1 day later (November 3), a season 1 day longer.

The first measurable snow (0.1 inch or more) in Broken Bow usually arrives around January 1, and the last of the season around January 30. Those are the middle dates across the winters of 1991–2020 at Carter Twr, OK, 8.6 miles away: half of years saw snow earlier, half later. Snow fell in 72% of those winters. The last 32°F night of spring typically comes 61 days after the last snow.

ZIP 74728 is 7 miles from Broken Bow 1 N, OK, which stands at 475 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 74728 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.