Frost Dates for 84025 — Farmington, Utah

Half of springs at Farmington 3 NW, UT see their last 32°F night by April 19; only one in ten is past it by April 1, and one in ten still has one after May 7. Planting tender crops after April 27 leaves a 30% risk of a frost on them, after May 1 20%, and after May 7 10%. The 18 days between the even-odds date and the one-in-ten date is narrower than at 47% 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 6 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 13 days later, around November 1; in spring the one-in-ten date for 28°F is April 19, 18 days before the 32°F one. The freeze-free season lasts 181 days in a typical year, longer than at 79% of the 66 Utah stations; it reaches 206 days one year in ten and falls short of 158 one year in ten. On average 122 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 14 days longer, to about May 3, and return around October 9. Severe cold of 16°F or below comes every winter, usually between December 3 and February 15.

July is the warmest month at Farmington 3 NW, UT, averaging 91°F by day and 64°F at night; January is the coldest at 36°F and 22°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 89% of years and May still brings one in 22% of years.

Warmth for growing adds up to 3,216 growing degree days a year (base 50°F), more than at 71% of the 66 Utah stations. 30% of them (958) have built up by the end of June, and July adds the most, 845. Precipitation totals 20.7 inches a year, most in May (2.7") and least in July (0.7"); May to September bring 33% of it.

The nearest other station, Bountiful Bench, UT, 7 miles south of Farmington and 570 feet higher, has a last frost 6 days later (April 25), a first frost 5 days later (October 24).

The first measurable snow (0.1 inch or more) in Farmington usually arrives around November 26, and the last of the season around April 9. Those are the middle dates across the winters of 1991–2020 at Farmington 3 NW, UT, 3.2 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 10 days after the last snow.

ZIP 84025 is 3 miles from Farmington 3 NW, UT, which stands at 4,380 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 84037 (Kaysville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 84025 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.