Upton, WY 82730 Frost Dates
When can you plant in Upton, WY?
Around 05/20 is the usual last spring frost, about 265 days away. The first fall frost typically arrives around 09/23, about 123 frost-free days later.
The USDA Plant Hardiness Zone Map puts Upton in Zone 4b (-25 to -20°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 Upton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Upton's last frost
05/20 is the middle of 30 years of NOAA records, not a promise. Plant by 05/08 and you're betting against frost in roughly 9 years out of 10. 06/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Upton compares
At roughly 123 frost-free days, Upton places 38,910 of 40,283 ZIP codes in this dataset. Within WY, it ranks 87 of 192.
Learn more
the frost range covers how to read the range around Upton's dates instead of trusting one. local microclimates covers what one yard in Upton can differ from the 82730 normal.