Frost Dates for 87410 — Aztec, New Mexico

Half of springs at Aztec Ruins Nm, NM see their last 32°F night by May 12; only one in ten is past it by April 29, and one in ten still has one after May 30. Planting tender crops after May 19 leaves a 30% risk of a frost on them, after May 24 20%, and after May 30 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 80% of the 70 New Mexico stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 6 in half of years, as early as September 24 one year in ten, and holds off past October 19 one year in ten. A hard freeze of 28°F follows 9 days later, around October 15; in spring the one-in-ten date for 28°F is May 12, 18 days before the 32°F one. The freeze-free season lasts 147 days in a typical year, shorter than at 69% of the 70 New Mexico stations; it reaches 164 days one year in ten and falls short of 127 one year in ten. On average 158 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 15 days longer, to about May 27, and return around September 30. Severe cold of 16°F or below comes every winter, usually between November 16 and March 13.

July is the warmest month at Aztec Ruins Nm, NM, averaging 94°F by day and 58°F at night; January is the coldest at 46°F and 17°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 83% of years.

Warmth for growing adds up to 3,277 growing degree days a year (base 50°F), fewer than at 53% of the 70 New Mexico stations. 32% of them (1,059) have built up by the end of June, and July adds the most, 807. Precipitation totals 10.1 inches a year, most in August (1.3") and least in June (0.3"); May to September bring 44% of it.

The nearest other station, Bloomfield 3 SE, NM, 12 miles south of Aztec and 162 feet higher, has a last frost 19 days earlier (April 23), a first frost 13 days later (October 19), a season 30 days longer.

The first measurable snow (0.1 inch or more) in Aztec usually arrives around November 30, and the last of the season around February 26. Those are the middle dates across the winters of 1991–2020 at Aztec Ruins Nm, NM, 1.9 miles away: half of years saw snow earlier, half later. Snow fell in 96% of those winters. The last 32°F night of spring typically comes 75 days after the last snow.

ZIP 87410 is 2 miles from Aztec Ruins Nm, NM, which stands at 5,644 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 87410 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.