West Valley City, UT 84120 Frost Dates
West Valley City, UT: when does the frost end?
Around 04/08 is the usual last spring frost, about 223 days away. Fall's first freeze usually shows up around 10/31, roughly 204 days after the last spring frost.
Zone 7b (5 to 10°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 West Valley City, not a forecast for this year.
Stretching the season past the first frost
With roughly 9 weeks until West Valley City's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/08 isn't a guarantee
04/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
West Valley City against the rest of the dataset
West Valley City's growing season runs about 204 days, ranking 16,460 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 29 of 344.
Learn more
Before leaning on 84120's figures: the frost range explains how to read the range around West Valley City's dates instead of trusting one, while local microclimates explains what one yard in West Valley City can differ from the 84120 normal.