Helper, UT 84529 Frost Dates
84529, near Helper, UT: the frost window
Typically, the last spring freeze lands around 05/03, roughly 248 days out. Fall's first freeze usually shows up around 10/12, roughly 160 days after the last spring frost.
Zone 6b (-5 to 0°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 Helper, not a forecast for this year.
Stretching the season past the first frost
Helper's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Helper against the rest of the dataset
Helper's growing season runs about 160 days, ranking 32,385 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 149 of 344.
Learn more
Two guides worth reading on 84529: the frost range, on how to read the range around Helper's dates instead of trusting one, and local microclimates, on what one yard in Helper can differ from the 84529 normal.