Altamont, UT 84001 Frost Dates
When can you plant in Altamont, UT?
Typically, the last spring freeze lands around 05/31, roughly 276 days out. The first fall frost typically arrives around 09/23, about 112 frost-free days later.
The USDA Plant Hardiness Zone Map puts Altamont 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 Altamont 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
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/16 and you're betting against frost in roughly 9 years out of 10. 06/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Altamont compares
Altamont's growing season runs about 112 days, ranking 39,436 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 319 of 344.
Learn more
zone vs. frost date covers why Zone 5b and Altamont's frost date answer different questions. the frost range covers how to read the range around Altamont's dates instead of trusting one.