Salt Lake City, UT 84133 Frost Dates
Frost dates for Salt Lake City, UT, ZIP 84133
Around 04/08 is the usual last spring frost, about 223 days away. The first fall frost typically arrives around 10/31, about 204 frost-free days later.
The USDA Plant Hardiness Zone Map puts Salt Lake City in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7b around Salt Lake City has about 9 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.
Why 04/08 isn't a guarantee
04/08 is the middle of 30 years of NOAA records, not a promise. Plant by 03/17 and you're betting against frost in roughly 9 years out of 10. 04/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Salt Lake City compares
At roughly 204 frost-free days, Salt Lake City places 16,446 of 40,283 ZIP codes in this dataset. Within UT, it ranks 26 of 344.
Learn more
the frost range explains how to read the range around Salt Lake City's dates instead of trusting one, and local microclimates explains what one yard in Salt Lake City can differ from the 84133 normal.