Frost Dates for 82431 — Lovell, Wyoming

Half of springs at Lovell, WY see their last 32°F night by May 9; only one in ten is past it by April 27, and one in ten still has one after May 25. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 19 20%, and after May 25 10%. The 16 days between the even-odds date and the one-in-ten date is wider than at 55% of the 33 Wyoming stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 29 in half of years, as early as September 16 one year in ten, and holds off past October 11 one year in ten. A hard freeze of 28°F follows 10 days later, around October 9; in spring the one-in-ten date for 28°F is May 12, 13 days before the 32°F one. The freeze-free season lasts 142 days in a typical year, longer than at 88% of the 33 Wyoming stations; it reaches 160 days one year in ten and falls short of 122 one year in ten. On average 182 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 13 days longer, to about May 22, and return around September 19. Severe cold of 16°F or below comes every winter, usually between November 6 and March 24.

July is the warmest month at Lovell, WY, averaging 87°F by day and 56°F at night; January is the coldest at 31°F and 7°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 78% of years.

Warmth for growing adds up to 2,207 growing degree days a year (base 50°F), more than at 64% of the 33 Wyoming stations. 29% of them (649) have built up by the end of June, and July adds the most, 652. Precipitation totals 6.5 inches a year, most in June (1.2") and least in January (0.2"); May to September bring 62% of it.

The nearest other station, Powell Field Stn, WY, 21 miles west of Lovell and 525 feet higher, has a last frost 10 days later (May 19), a first frost 9 days earlier (September 20), a season 19 days shorter.

The first measurable snow (0.1 inch or more) in Lovell usually arrives around November 22, and the last of the season around March 8. Those are the middle dates across the winters of 1991–2020 at Lovell, WY, 4.9 miles away: half of years saw snow earlier, half later. Snow fell in 93% of those winters. The last 32°F night of spring typically comes 62 days after the last snow.

ZIP 82431 is 5 miles from Lovell, WY, which stands at 3,847 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 82431 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.