Millville, UT 84326 Frost Dates
Frost dates for Millville, UT, ZIP 84326
Around 05/12 is the usual last spring frost, about 257 days away. The first fall frost typically arrives around 09/28, about 138 frost-free days later.
Millville sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6a around Millville 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.
How much risk comes with planting early here
05/12 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Millville compares
Millville's growing season runs about 138 days, ranking 37,400 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 225 of 344.
Learn more
the frost range explains how to read the range around Millville's dates instead of trusting one, and local microclimates explains what one yard in Millville can differ from the 84326 normal.