Howell, UT 84316 Frost Dates
Frost dates for Howell, UT, ZIP 84316
Typically, the last spring freeze lands around 05/17, roughly 262 days out. The first fall frost typically arrives around 09/24, about 128 frost-free days later.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Howell, not a forecast for this year.
What to do before the first frost
Zone 6a around Howell has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/17 isn't a guarantee
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/05 and you're betting against frost in roughly 9 years out of 10. 06/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Howell compares
Howell's growing season runs about 128 days, ranking 38,577 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 257 of 344.
Learn more
local microclimates explains what one yard in Howell can differ from the 84316 normal, and zone vs. frost date explains why Zone 6a and Howell's frost date answer different questions.