Frost Dates for 58249 — Langdon, North Dakota

Half of springs at Langdon Exp Farm, ND see their last 32°F night by May 17; only one in ten is past it by May 4, and one in ten still has one after May 30. Planting tender crops after May 23 leaves a 30% risk of a frost on them, after May 26 20%, and after May 30 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 21% of the 33 North Dakota stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 26 in half of years, as early as September 13 one year in ten, and holds off past October 7 one year in ten. A hard freeze of 28°F follows 8 days later, around October 4; in spring the one-in-ten date for 28°F is May 21, 9 days before the 32°F one. The freeze-free season lasts 132 days in a typical year, shorter than at 79% of the 33 North Dakota stations; it reaches 150 days one year in ten and falls short of 114 one year in ten. On average 200 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 9 days longer, to about May 26, and return around September 18. Severe cold of 16°F or below comes every winter, usually between November 1 and April 9.

July is the warmest month at Langdon Exp Farm, ND, averaging 77°F by day and 56°F at night; January is the coldest at 13°F and -5°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month.

Warmth for growing adds up to 1,749 growing degree days a year (base 50°F), the fewest of the 33 North Dakota stations. 30% of them (531) have built up by the end of June, and July adds the most, 502. Precipitation totals 20.8 inches a year, most in June (4.2") and least in February (0.4"); May to September bring 74% of it.

The nearest other station, Cavalier 7NW, ND, 28 miles east of Langdon and 716 feet lower, has a last frost 5 days earlier (May 12), a first frost 4 days later (September 30), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Langdon usually arrives around October 31, and the last of the season around April 12. Those are the middle dates across the winters of 1991–2020 at Langdon Exp Farm, ND, 3.8 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 35 days after the last snow.

ZIP 58249 is 4 miles from Langdon Exp Farm, ND, which stands at 1,615 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 58249 in zone 3b, the band where the coldest night of the year averaged -35 to -30°F (-37.2 to -34.4°C) over 1991–2020; a zone describes winter lows, not frost dates.