Brigham City, UT 84302 Frost Dates
Frost dates for Brigham City, UT, ZIP 84302
Typically, the last spring freeze lands around 05/05, roughly 250 days out. The first fall frost typically arrives around 10/05, about 150 frost-free days later.
Brigham City sits in USDA Zone 6b (-5 to 0°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 6b around Brigham City 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.
How much risk comes with planting early here
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 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 Brigham City compares
Brigham City's growing season runs about 150 days, ranking 35,251 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 196 of 344.
Learn more
the frost range explains how to read the range around Brigham City's dates instead of trusting one, and local microclimates explains what one yard in Brigham City can differ from the 84302 normal.