Frost Dates for 84054 — North Salt Lake, Utah

Half of springs at Bountiful-Val Verda, UT see their last 32°F night by April 24; only one in ten is past it by April 5, and one in ten still has one after May 14. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 6 20%, and after May 14 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 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 28, 16 days before the 32°F one. The freeze-free season lasts 178 days in a typical year, longer than at 76% of the 66 Utah stations; it reaches 201 days one year in ten and falls short of 155 one year in ten. On average 118 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 15 days longer, to about May 9, and return around October 9. Severe cold of 16°F or below comes every winter, usually between December 2 and February 12.

July is the warmest month at Bountiful-Val Verda, UT, averaging 91°F by day and 63°F at night; January is the coldest at 38°F and 22°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 29% of years.

Warmth for growing adds up to 3,174 growing degree days a year (base 50°F), more than at 70% of the 66 Utah stations. 30% of them (948) have built up by the end of June, and July adds the most, 837. Precipitation totals 22.6 inches a year, most in April (3.3") and least in July (0.8"); May to September bring 31% of it.

The nearest other station, Bountiful Bench, UT, 4 miles northeast of North Salt Lake and 410 feet higher, has a last frost 1 day later (April 25), a first frost 5 days later (October 24), a season 3 days longer.

The first measurable snow (0.1 inch or more) in North Salt Lake usually arrives around November 8, and the last of the season around April 1. Those are the middle dates across the winters of 1991–2020 at Bountiful-Val Verda, UT, 1.1 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 23 days after the last snow.

ZIP 84054 is 1 mile from Bountiful-Val Verda, UT, which stands at 4,540 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 84054 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.