Frost Dates for 80470 — Pine, Colorado

Half of springs at Bailey, CO see their last 32°F night by June 16; only one in ten is past it by June 2, and one in ten still has one after July 1. Planting tender crops after June 22 leaves a 30% risk of a frost on them, after June 27 20%, and after July 1 10%. The 15 days between the even-odds date and the one-in-ten date is wider than at 56% of the 110 Colorado stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 8 in half of years, as early as August 27 one year in ten, and holds off past September 20 one year in ten. A hard freeze of 28°F follows 11 days later, around September 19; in spring the one-in-ten date for 28°F is June 15, 16 days before the 32°F one. The freeze-free season lasts 84 days in a typical year, shorter than at 94% of the 110 Colorado stations; it reaches 104 days one year in ten and falls short of 64 one year in ten. On average 235 nights a year drop to 32°F or below. Severe cold of 16°F or below comes every winter, usually between October 19 and April 21.

July is the warmest month at Bailey, CO, averaging 79°F by day and 44°F at night; December is the coldest at 37°F and 9°F. A freezing night is all but certain in every month from September to June (a 90% chance or more). No month is safe from a 32°F night: even the warmest has at least a 10% chance. In spring, July still brings one in 11% of years.

Warmth for growing adds up to 1,085 growing degree days a year (base 50°F), fewer than at 89% of the 110 Colorado stations. 24% of them (264) have built up by the end of June, and July adds the most, 369. Precipitation totals 17.2 inches a year, most in July (2.7") and least in January (0.5"); May to September bring 59% of it.

The nearest other station, Evergreen, CO, 13 miles north of Pine and 767 feet lower, has a last frost 24 days earlier (May 23), a first frost 14 days later (September 22), a season 34 days longer.

The first measurable snow (0.1 inch or more) in Pine usually arrives around October 9, and the last of the season around May 15. Those are the middle dates across the winters of 1991–2020 at Bailey, CO, 6.7 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 32 days after the last snow.

ZIP 80470 is 7 miles from Bailey, CO, which stands at 7,752 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 80421 (Bailey). The 2023 USDA Plant Hardiness Zone Map lists ZIP 80470 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.