Salt Lake City, UT 84103 Frost Dates
84103, near Salt Lake City, UT: the frost window
Typically, the last spring freeze lands around 04/08, roughly 223 days out. Fall's first freeze usually shows up around 10/31, roughly 204 days after the last spring frost.
Salt Lake 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.
Stretching the season past the first frost
Salt Lake City'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.
The actual range around Salt Lake City's last frost
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.
Salt Lake City against the rest of the dataset
At roughly 204 frost-free days, Salt Lake City places 16,442 of 40,283 ZIP codes in this dataset. Within UT, it ranks 22 of 344.
Learn more
Two guides worth reading on 84103: local microclimates, on what one yard in Salt Lake City can differ from the 84103 normal, and zone vs. frost date, on why Zone 6b and Salt Lake City's frost date answer different questions.