Frost Dates for 74441 — Hulbert, Oklahoma

Half of springs at Tahlequah, OK see their last 32°F night by April 4; only one in ten is past it by March 17, and one in ten still has one after April 24. Planting tender crops after April 11 leaves a 30% risk of a frost on them, after April 16 20%, and after April 24 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 October 31 in half of years, as early as October 16 one year in ten, and holds off past November 16 one year in ten. A hard freeze of 28°F follows 10 days later, around November 10; in spring the one-in-ten date for 28°F is April 9, 15 days before the 32°F one. The freeze-free season lasts 209 days in a typical year, shorter than at 58% of the 114 Oklahoma stations; it reaches 236 days one year in ten and falls short of 186 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 11 days longer, to about April 15, and return around October 23. Severe cold of 16°F or below comes in 99% of winters, usually between December 17 and February 16.

July is the warmest month at Tahlequah, OK, averaging 93°F by day and 69°F at night; January is the coldest at 51°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 59% of years.

Warmth for growing adds up to 5,106 growing degree days a year (base 50°F), fewer than at 57% of the 114 Oklahoma stations. 39% of them (1,969) have built up by the end of June, and July adds the most, 962. Precipitation totals 51.0 inches a year, most in May (6.3") and least in January (2.5"); May to September bring 49% of it.

The nearest other station, Wagoner, OK, 12 miles west of Hulbert and 260 feet lower, has a last frost 6 days earlier (March 29), a first frost 5 days later (November 5), a season 14 days longer.

The first measurable snow (0.1 inch or more) in Hulbert usually arrives around January 11, and the last of the season around February 7. Those are the middle dates across the winters of 1991–2020 at Tahlequah, OK, 10.8 miles away: half of years saw snow earlier, half later. Snow fell in 67% of those winters. The last 32°F night of spring typically comes 56 days after the last snow.

ZIP 74441 is 11 miles from Tahlequah, OK, which stands at 850 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 74464 (Tahlequah). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74441 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.