Bluff, UT 84531 Frost Dates
84531, near Bluff, UT: the frost window
Typically, the last spring freeze lands around 04/11, roughly 226 days out. Fall's first freeze usually shows up around 10/30, roughly 201 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Bluff in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Bluff's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/26 and only about 1 year in 10 sees frost after that.
Bluff against the rest of the dataset
About 201 days separate Bluff's last and first frost, putting it 17,656 of 40,283 ZIP codes nationally. Within UT, it ranks 68 of 344.
Learn more
Two guides worth reading on 84531: zone vs. frost date, on why Zone 7b and Bluff's frost date answer different questions, and the frost range, on how to read the range around Bluff's dates instead of trusting one.