Frost Dates for 84532 — Moab, Utah

Half of springs at Moab, UT see their last 32°F night by April 11; only one in ten is past it by March 25, and one in ten still has one after April 28. Planting tender crops after April 18 leaves a 30% risk of a frost on them, after April 21 20%, and after April 28 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 68% of the 66 Utah stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 23 in half of years, as early as October 8 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 9 days later, around November 1; in spring the one-in-ten date for 28°F is April 12, 16 days before the 32°F one. The freeze-free season lasts 192 days in a typical year, longer than at 92% of the 66 Utah stations; it reaches 214 days one year in ten and falls short of 172 one year in ten. On average 117 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 April 26, and return around October 11. Severe cold of 16°F or below comes in 99% of winters, usually between December 7 and February 3.

July is the warmest month at Moab, UT, averaging 99°F by day and 66°F at night; January is the coldest at 44°F and 21°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 76% of years.

Warmth for growing adds up to 4,517 growing degree days a year (base 50°F), more than at 97% of the 66 Utah stations. 37% of them (1,651) have built up by the end of June, and July adds the most, 1,015. Precipitation totals 9.3 inches a year, most in October (1.0") and least in June (0.4"); May to September bring 42% of it.

The first measurable snow (0.1 inch or more) in Moab usually arrives around December 11, and the last of the season around February 15. Those are the middle dates across the winters of 1991–2020 at Moab, UT, 2.8 miles away: half of years saw snow earlier, half later. Snow fell in 97% of those winters. The last 32°F night of spring typically comes 55 days after the last snow.

ZIP 84532 is 3 miles from Moab, UT, which stands at 4,053 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 84532 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.