Hinckley, UT 84635 Frost Dates
Frost dates for Hinckley, UT, ZIP 84635
Around 05/16 is the usual last spring frost, about 261 days away. The first fall frost typically arrives around 09/29, about 137 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 Hinckley, not a forecast for this year.
What to do before the first frost
Zone 6a around Hinckley 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.
Why 05/16 isn't a guarantee
05/16 is the middle of 30 years of NOAA records, not a promise. Plant by 04/29 and you're betting against frost in roughly 9 years out of 10. 06/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hinckley compares
At roughly 137 frost-free days, Hinckley places 37,558 of 40,283 ZIP codes in this dataset. Within UT, it ranks 229 of 344.
Learn more
the frost range explains how to read the range around Hinckley's dates instead of trusting one, and local microclimates explains what one yard in Hinckley can differ from the 84635 normal.