Monticello, UT 84535 Frost Dates
Frost dates for Monticello, UT, ZIP 84535
Typically, the last spring freeze lands around 05/19, roughly 264 days out. The first fall frost typically arrives around 10/02, about 133 frost-free days later.
The USDA Plant Hardiness Zone Map puts Monticello in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6b around Monticello has about 5 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.
The actual range around Monticello's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 06/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Monticello compares
At roughly 133 frost-free days, Monticello places 38,069 of 40,283 ZIP codes in this dataset. Within UT, it ranks 239 of 344.
Learn more
the frost range explains how to read the range around Monticello's dates instead of trusting one, and local microclimates explains what one yard in Monticello can differ from the 84535 normal.