Frost Dates for 84604 — Provo, Utah

Half of springs at Provo Byu, UT see their last 32°F night by April 18; only one in ten is past it by March 31, and one in ten still has one after May 5. Planting tender crops after April 25 leaves a 30% risk of a frost on them, after April 30 20%, and after May 5 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 21 in half of years, as early as October 7 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 11 days later, around November 1; in spring the one-in-ten date for 28°F is April 17, 18 days before the 32°F one. The freeze-free season lasts 185 days in a typical year, longer than at 85% of the 66 Utah stations; it reaches 208 days one year in ten and falls short of 163 one year in ten. On average 111 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 3, and return around October 10. Severe cold of 16°F or below comes in 99% of winters, usually between December 6 and February 9.

July is the warmest month at Provo Byu, UT, averaging 95°F by day and 62°F at night; January is the coldest at 41°F and 24°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 87% of years and May still brings one in 18% of years.

Warmth for growing adds up to 3,665 growing degree days a year (base 50°F), more than at 86% of the 66 Utah stations. 33% of them (1,192) have built up by the end of June, and July adds the most, 891. Precipitation totals 17.2 inches a year, most in January (2.0") and least in July (0.5"); May to September bring 31% of it.

The nearest other station, Orem Trtmt Plt, UT, 5 miles west of Provo, has a last frost 1 day later (April 19), a first frost 2 days earlier (October 19), a season 3 days shorter.

The first measurable snow (0.1 inch or more) in Provo usually arrives around November 6, and the last of the season around April 8. Those are the middle dates across the winters of 1991–2020 at Provo Byu, UT, 2.4 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 84604 is 2 miles from Provo Byu, UT, which stands at 4,570 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 84604 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.