Vernal, UT 84078 Frost Dates
When can you plant in Vernal, UT?
Around 05/07 is the usual last spring frost, about 252 days away. The first fall frost typically arrives around 10/06, about 150 frost-free days later.
Zone 5b (-15 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 Vernal, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Vernal before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Vernal compares
At roughly 150 frost-free days, Vernal places 35,258 of 40,283 ZIP codes in this dataset. Within UT, it ranks 197 of 344.
Learn more
the frost range covers how to read the range around Vernal's dates instead of trusting one. local microclimates covers what one yard in Vernal can differ from the 84078 normal.