Frost Dates for 82941 — Pinedale, Wyoming

Half of springs at Burris, WY see their last 32°F night by June 1; only one in ten is past it by May 17, and one in ten still has one after June 19. Planting tender crops after June 8 leaves a 30% risk of a frost on them, after June 14 20%, and after June 19 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 82% of the 34 Wyoming stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 14 in half of years, as early as September 1 one year in ten, and holds off past September 27 one year in ten. A hard freeze of 28°F follows 12 days later, around September 26; in spring the one-in-ten date for 28°F is May 31, 19 days before the 32°F one. The freeze-free season lasts 104 days in a typical year, shorter than at 76% of the 34 Wyoming stations; it reaches 125 days one year in ten and falls short of 79 one year in ten. On average 206 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 19 days longer, to about June 20, and return around September 1. Severe cold of 16°F or below comes every winter, usually between October 26 and April 10.

July is the warmest month at Burris, WY, averaging 82°F by day and 48°F at night; December is the coldest at 36°F and 11°F. A freezing night is all but certain in every month from September to May (a 90% chance or more). From July to August the chance of a 32°F night stays under 10% each month. In spring, June still brings one in 52% of years.

Warmth for growing adds up to 1,422 growing degree days a year (base 50°F), fewer than at 76% of the 34 Wyoming stations. 25% of them (360) have built up by the end of June, and July adds the most, 461. Precipitation totals 8.9 inches a year, most in May (2.1") and least in January (0.1"); May to September bring 63% of it.

The first measurable snow (0.1 inch or more) in Pinedale usually arrives around October 14, and the last of the season around May 7. Those are the middle dates across the winters of 1991–2020 at Pinedale, WY, 0.1 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 25 days after the last snow.

ZIP 82941 is 45 miles from Burris, WY, which stands at 6,125 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. That is farther than 25 miles, so local frost can differ noticeably from these figures. The 2023 USDA Plant Hardiness Zone Map lists ZIP 82941 in zone 4b, the band where the coldest night of the year averaged -25 to -20°F (-31.7 to -28.9°C) over 1991–2020; a zone describes winter lows, not frost dates.