Frost Dates for 84097 — Orem, Utah

Half of springs at Orem Trtmt Plt, UT see their last 32°F night by April 19; only one in ten is past it by April 2, and one in ten still has one after May 9. Planting tender crops after April 26 leaves a 30% risk of a frost on them, after May 1 20%, and after May 9 10%. The 20 days between the even-odds date and the one-in-ten date is wider than at 61% of the 66 Utah stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 19 in half of years, as early as October 5 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 12 days later, around October 31; in spring the one-in-ten date for 28°F is April 20, 19 days before the 32°F one. The freeze-free season lasts 182 days in a typical year, longer than at 82% of the 66 Utah stations; it reaches 205 days one year in ten and falls short of 158 one year in ten. On average 108 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 13 days longer, to about May 2, and return around October 8. Severe cold of 16°F or below comes every winter, usually between November 28 and February 17.

July is the warmest month at Orem Trtmt Plt, UT, averaging 93°F by day and 64°F at night; January is the coldest at 38°F and 20°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 90% of years and May still brings one in 20% of years.

Warmth for growing adds up to 3,465 growing degree days a year (base 50°F), more than at 82% of the 66 Utah stations. 33% of them (1,142) have built up by the end of June, and July adds the most, 874.

The nearest other station, Provo Byu, UT, 4 miles south of Orem, has a last frost 1 day earlier (April 18), a first frost 2 days later (October 21), a season 3 days longer.

The first measurable snow (0.1 inch or more) in Orem usually arrives around November 16, and the last of the season around April 7. Those are the middle dates across the winters of 1991–2020 at Orem Trtmt Plt, UT, 3.7 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 12 days after the last snow.

ZIP 84097 is 4 miles from Orem Trtmt Plt, UT, which stands at 4,510 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 84057 (Orem). The 2023 USDA Plant Hardiness Zone Map lists ZIP 84097 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.