Bluff, UT 86538 Frost Dates
Frost dates for Bluff, UT, ZIP 86538
Typically, the last spring freeze lands around 05/06, roughly 251 days out. The first fall frost typically arrives around 10/08, about 153 frost-free days later.
Bluff sits in USDA Zone 7a (0 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 7a around Bluff has about 6 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
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bluff compares
At roughly 153 frost-free days, Bluff places 34,636 of 40,283 ZIP codes in this dataset. Within UT, it ranks 195 of 344.
Learn more
local microclimates explains what one yard in Bluff can differ from the 86538 normal, and zone vs. frost date explains why Zone 7a and Bluff's frost date answer different questions.