Cottonwood Heights, UT 84121 Frost Dates
When can you plant in Cottonwood Heights, UT?
Around 05/07 is the usual last spring frost, about 252 days away. The first fall frost typically arrives around 10/14, about 158 frost-free days later.
The USDA Plant Hardiness Zone Map puts Cottonwood Heights in Zone 6a (-10 to -5°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
About 7 weeks of growing season left in Cottonwood Heights before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cottonwood Heights compares
At roughly 158 frost-free days, Cottonwood Heights places 32,900 of 40,283 ZIP codes in this dataset. Within UT, it ranks 176 of 344.
Learn more
zone vs. frost date covers why Zone 6a and Cottonwood Heights's frost date answer different questions. the frost range covers how to read the range around Cottonwood Heights's dates instead of trusting one.