Park City, UT 84098 Frost Dates
When can you plant in Park City, UT?
Around 05/29 is the usual last spring frost, about 274 days away. The first fall frost typically arrives around 09/25, about 117 frost-free days later.
The USDA Plant Hardiness Zone Map puts Park City in Zone 5b (-15 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
About 4 weeks of growing season left in Park City before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/29 isn't a guarantee
05/29 is the middle of 30 years of NOAA records, not a promise. Plant by 05/12 and you're betting against frost in roughly 9 years out of 10. 06/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Park City compares
Park City's growing season runs about 117 days, ranking 39,243 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 308 of 344.
Learn more
zone vs. frost date covers why Zone 5b and Park City's frost date answer different questions. the frost range covers how to read the range around Park City's dates instead of trusting one.