Roy, UT 84315 Frost Dates
When can you plant in Roy, UT?
Around 04/22 is the usual last spring frost, about 237 days away. The first fall frost typically arrives around 10/22, about 180 frost-free days later.
The USDA Plant Hardiness Zone Map puts Roy in Zone 7a (0 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 8 weeks of growing season left in Roy before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/22 isn't a guarantee
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Roy compares
Roy's growing season runs about 180 days, ranking 24,783 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 103 of 344.
Learn more
the frost range covers how to read the range around Roy's dates instead of trusting one. local microclimates covers what one yard in Roy can differ from the 84315 normal.