Frost Dates for 84404 — Ogden, Utah

Half of springs at Ogden Sugar Factory, UT see their last 32°F night by April 22; only one in ten is past it by April 5, and one in ten still has one after May 9. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 3 20%, and after May 9 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 68% of the 66 Utah stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 18 in half of years, as early as October 1 one year in ten, and holds off past November 2 one year in ten. A hard freeze of 28°F follows 11 days later, around October 29; in spring the one-in-ten date for 28°F is April 22, 17 days before the 32°F one. The freeze-free season lasts 177 days in a typical year, longer than at 74% of the 66 Utah stations; it reaches 201 days one year in ten and falls short of 154 one year in ten. On average 128 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 7, and return around October 6. Severe cold of 16°F or below comes every winter, usually between November 28 and February 18.

July is the warmest month at Ogden Sugar Factory, UT, averaging 95°F by day and 62°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 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 28% of years.

Warmth for growing adds up to 3,409 growing degree days a year (base 50°F), more than at 79% of the 66 Utah stations. 31% of them (1,070) have built up by the end of June, and July adds the most, 878. Precipitation totals 18.9 inches a year, most in January (2.4") and least in July (0.6"); May to September bring 32% of it.

The nearest other station, Ogden Pioneer Ph, UT, 4 miles southeast of Ogden, has a last frost 1 day earlier (April 21), a first frost 5 days later (October 23), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Ogden usually arrives around November 29, and the last of the season around March 3. Those are the middle dates across the winters of 1991–2020 at Ogden Pioneer Ph, UT, 4.2 miles away: half of years saw snow earlier, half later. Snow fell in 89% of those winters. The last 32°F night of spring typically comes 50 days after the last snow.

ZIP 84404 is 3 miles from Ogden Sugar Factory, UT, which stands at 4,280 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 84404 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.