Frost Dates for 81615 — Snowmass Village, Colorado

Half of springs at Aspen Pitkin Co Airport, CO see their last 32°F night by May 31; only one in ten is past it by May 16, and one in ten still has one after June 14. Planting tender crops after June 5 leaves a 30% risk of a frost on them, after June 9 20%, and after June 14 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 45% of the 110 Colorado stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 23 in half of years, as early as September 11 one year in ten, and holds off past October 3 one year in ten. A hard freeze of 28°F follows 9 days later, around October 2; in spring the one-in-ten date for 28°F is June 1, 13 days before the 32°F one. The freeze-free season lasts 114 days in a typical year, shorter than at 72% of the 110 Colorado stations; it reaches 133 days one year in ten and falls short of 94 one year in ten. On average 212 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 June 12, and return around September 13. Severe cold of 16°F or below comes every winter, usually between October 29 and April 3.

July is the warmest month at Aspen Pitkin Co Airport, CO, averaging 82°F by day and 48°F at night; January is the coldest at 35°F and 9°F. A freezing night is all but certain in every month from October 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 46% of years.

Warmth for growing adds up to 1,507 growing degree days a year (base 50°F), fewer than at 79% of the 110 Colorado stations. 26% of them (390) have built up by the end of June, and July adds the most, 473. Precipitation totals 14.8 inches a year, most in April (1.8") and least in December (0.8"); May to September bring 47% of it.

The nearest other station, Aspen 1SW, CO, 6 miles east of Snowmass Village and 455 feet higher, has a last frost 2 days later (June 2), the same first-frost date, a season 1 day shorter.

The first measurable snow (0.1 inch or more) in Snowmass Village usually arrives around October 7, and the last of the season around May 14. Those are the middle dates across the winters of 1991–2020 at Aspen 1SW, CO, 6.1 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 17 days after the last snow.

ZIP 81615 is 4 miles from Aspen Pitkin Co Airport, CO, which stands at 7,720 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 81621 (Basalt). The 2023 USDA Plant Hardiness Zone Map lists ZIP 81615 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.