Frost Dates for 84528 — Huntington, Utah

Half of springs at Castle Dale, UT see their last 32°F night by May 18; only one in ten is past it by May 4, and one in ten still has one after June 8. Planting tender crops after May 26 leaves a 30% risk of a frost on them, after May 31 20%, and after June 8 10%. The 21 days between the even-odds date and the one-in-ten date is wider than at 74% of the 66 Utah stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.

In fall the first 32°F night comes by September 27 in half of years, as early as September 14 one year in ten, and holds off past October 9 one year in ten. A hard freeze of 28°F follows 8 days later, around October 5; in spring the one-in-ten date for 28°F is May 20, 19 days before the 32°F one. The freeze-free season lasts 128 days in a typical year, shorter than at 68% of the 66 Utah stations; it reaches 149 days one year in ten and falls short of 108 one year in ten. On average 186 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 16 days longer, to about June 3, and return around September 18. Severe cold of 16°F or below comes every winter, usually between November 6 and March 21.

July is the warmest month at Castle Dale, UT, averaging 91°F by day and 54°F at night; January is the coldest at 40°F and 10°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 18% of years.

Warmth for growing adds up to 2,574 growing degree days a year (base 50°F), fewer than at 58% of the 66 Utah stations. 31% of them (787) have built up by the end of June, and July adds the most, 705. Precipitation totals 8.0 inches a year, most in September (1.0") and least in April (0.5"); May to September bring 46% of it.

The nearest other station, Price Carbon Co Airport, UT, 22 miles northeast of Huntington and 292 feet higher, has a last frost 15 days earlier (May 3), a first frost 15 days later (October 12), a season 32 days longer.

The first measurable snow (0.1 inch or more) in Huntington usually arrives around December 8, and the last of the season around March 9. Those are the middle dates across the winters of 1991–2020 at Castle Dale, UT, 9.6 miles away: half of years saw snow earlier, half later. Snow fell in 93% of those winters. The last 32°F night of spring typically comes 70 days after the last snow.

ZIP 84528 is 10 miles from Castle Dale, UT, which stands at 5,629 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 84528 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.