Frost Dates for 84050 — Morgan, Utah

Half of springs at Morgan, UT see their last 32°F night by May 25; only one in ten is past it by May 7, and one in ten still has one after June 13. Planting tender crops after June 3 leaves a 30% risk of a frost on them, after June 7 20%, and after June 13 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 55% of the 66 Utah stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 24 in half of years, as early as September 11 one year in ten, and holds off past October 6 one year in ten. A hard freeze of 28°F follows 10 days later, around October 4; in spring the one-in-ten date for 28°F is May 31, 13 days before the 32°F one. The freeze-free season lasts 119 days in a typical year, shorter than at 77% of the 66 Utah stations; it reaches 142 days one year in ten and falls short of 97 one year in ten. On average 181 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 17 days longer, to about June 11, and return around September 14. Severe cold of 16°F or below comes every winter, usually between November 8 and March 20.

July is the warmest month at Morgan, UT, averaging 92°F by day and 52°F at night; January is the coldest at 37°F and 14°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 36% of years.

Warmth for growing adds up to 2,331 growing degree days a year (base 50°F), fewer than at 70% of the 66 Utah stations. 27% of them (633) have built up by the end of June, and July adds the most, 679. Precipitation totals 17.1 inches a year, most in January (1.8") and least in July (0.6"); May to September bring 33% of it.

The nearest other station, Weber Basin Pump Plt 3, UT, 11 miles west of Morgan and 200 feet lower, has a last frost 26 days earlier (April 29), a first frost 26 days later (October 20), a season 53 days longer.

The first measurable snow (0.1 inch or more) in Morgan usually arrives around November 6, and the last of the season around April 3. Those are the middle dates across the winters of 1991–2020 at Morgan, UT, 1.2 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 52 days after the last snow.

ZIP 84050 is 1 mile from Morgan, UT, which stands at 5,100 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 84050 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.