Frost Dates for 80723 — Brush, Colorado

Half of springs at Woodrow 6NNE, CO see their last 32°F night by May 15; only one in ten is past it by May 3, and one in ten still has one after May 28. Planting tender crops after May 19 leaves a 30% risk of a frost on them, after May 23 20%, and after May 28 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 67% of the 110 Colorado stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 1 in half of years, as early as September 21 one year in ten, and holds off past October 12 one year in ten. A hard freeze of 28°F follows 8 days later, around October 9; in spring the one-in-ten date for 28°F is May 18, 10 days before the 32°F one. The freeze-free season lasts 140 days in a typical year, shorter than at 53% of the 110 Colorado stations; it reaches 154 days one year in ten and falls short of 122 one year in ten. On average 192 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 10 days longer, to about May 25, and return around September 24. Severe cold of 16°F or below comes every winter, usually between November 1 and April 1.

July is the warmest month at Woodrow 6NNE, CO, averaging 91°F by day and 57°F at night; January is the coldest at 42°F and 9°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 2,737 growing degree days a year (base 50°F), more than at 62% of the 110 Colorado stations. 29% of them (793) have built up by the end of June, and July adds the most, 751. Precipitation totals 16.0 inches a year, most in July (2.8") and least in January (0.3"); May to September bring 69% of it.

The nearest other station, Fort Morgan, CO, 14 miles west of Brush, has a last frost 9 days earlier (May 6), a first frost 5 days later (October 6), a season 13 days longer.

The first measurable snow (0.1 inch or more) in Brush usually arrives around November 1, and the last of the season around April 14. Those are the middle dates across the winters of 1991–2020 at Brush 0.8 S, CO, 1.4 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 31 days after the last snow.

ZIP 80723 is 11 miles from Woodrow 6NNE, CO, which stands at 4,374 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 80723 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.