Alton, UT 84762 Frost Dates
Frost dates for Alton, UT, ZIP 84762
The last spring frost here typically falls around 06/01, about 277 days from today. The first fall frost typically arrives around 09/30, about 120 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 Alton, not a forecast for this year.
What to do before the first frost
Zone 6a around Alton 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 06/01 isn't a guarantee
06/01 is the middle of 30 years of NOAA records, not a promise. Plant by 05/16 and you're betting against frost in roughly 9 years out of 10. 06/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Alton compares
Alton's growing season runs about 120 days, ranking 39,112 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 297 of 344.
Learn more
the frost range explains how to read the range around Alton's dates instead of trusting one, and local microclimates explains what one yard in Alton can differ from the 84762 normal.