Frost Dates for 84049 — Midway, Utah

Half of springs at Snake Creek Powerhouse, UT see their last 32°F night by May 31; only one in ten is past it by May 13, and one in ten still has one after June 23. Planting tender crops after June 7 leaves a 30% risk of a frost on them, after June 12 20%, and after June 23 10%. The 23 days between the even-odds date and the one-in-ten date is wider than at 86% 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 11 in half of years, as early as August 14 one year in ten, and holds off past September 28 one year in ten. A hard freeze of 28°F follows 14 days later, around September 25; in spring the one-in-ten date for 28°F is June 7, 16 days before the 32°F one. The freeze-free season lasts 101 days in a typical year, shorter than at 91% of the 66 Utah stations; it reaches 126 days one year in ten and falls short of 69 one year in ten. On average 206 nights a year drop to 32°F or below. Severe cold of 16°F or below comes every winter, usually between November 6 and March 31.

July is the warmest month at Snake Creek Powerhouse, UT, averaging 88°F by day and 47°F at night; January is the coldest at 36°F and 14°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). July is the only month with under a 10% chance of a 32°F night. In spring, June still brings one in 43% of years.

Warmth for growing adds up to 1,760 growing degree days a year (base 50°F), fewer than at 86% of the 66 Utah stations. 28% of them (485) have built up by the end of June, and July adds the most, 545. Precipitation totals 21.7 inches a year, most in January (2.8") and least in July (0.7"); May to September bring 30% of it.

The nearest other station, Heber, UT, 4 miles southeast of Midway and 420 feet lower, has a last frost 4 days later (June 4), a first frost 9 days later (September 20), a season 5 days longer.

The first measurable snow (0.1 inch or more) in Midway usually arrives around October 31, and the last of the season around April 19. Those are the middle dates across the winters of 1991–2020 at Heber, UT, 4.2 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 42 days after the last snow.

ZIP 84049 is 2 miles from Snake Creek Powerhouse, UT, which stands at 6,010 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 84049 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.