Frost Dates for 74006 — Bartlesville, Oklahoma

Half of springs at Bartlesville 3, OK see their last 32°F night by April 11; only one in ten is past it by March 27, and one in ten still has one after April 30. Planting tender crops after April 19 leaves a 30% risk of a frost on them, after April 23 20%, and after April 30 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 October 24 in half of years, as early as October 8 one year in ten, and holds off past November 6 one year in ten. A hard freeze of 28°F follows 9 days later, around November 2; in spring the one-in-ten date for 28°F is April 15, 15 days before the 32°F one. The freeze-free season lasts 195 days in a typical year, shorter than at 94% of the 114 Oklahoma stations; it reaches 215 days one year in ten and falls short of 173 one year in ten. On average 109 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 23, and return around October 15. Severe cold of 16°F or below comes every winter, usually between December 2 and February 28.

July is the warmest month at Bartlesville 3, OK, averaging 93°F by day and 68°F at night; January is the coldest at 48°F and 22°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 80% of years.

Warmth for growing adds up to 4,575 growing degree days a year (base 50°F), fewer than at 95% of the 114 Oklahoma stations. 37% of them (1,691) have built up by the end of June, and July adds the most, 947. Precipitation totals 39.7 inches a year, most in June (5.3") and least in February (1.9"); May to September bring 52% of it.

The nearest other station, Nowata, OK, 16 miles east of Bartlesville, has a last frost 7 days earlier (April 4), a first frost 8 days later (November 1), a season 15 days longer.

The first measurable snow (0.1 inch or more) in Bartlesville usually arrives around December 16, and the last of the season around February 9. Those are the middle dates across the winters of 1991–2020 at Wann, OK, 14.8 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 61 days after the last snow.

ZIP 74006 is 5 miles from Bartlesville 3, OK, which stands at 715 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 74006 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.