Pavillion, WY 82516 Frost Dates
When can you plant in Pavillion, WY?
Around 05/16 is the usual last spring frost, about 261 days away. The first fall frost typically arrives around 09/28, about 133 frost-free days later.
Zone 5a (-20 to -15°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 Pavillion, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Pavillion before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/16 isn't a guarantee
05/16 is the middle of 30 years of NOAA records, not a promise. Plant by 05/01 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pavillion compares
About 133 days separate Pavillion's last and first frost, putting it 38,137 of 40,283 ZIP codes nationally. Within WY, it ranks 55 of 192.
Learn more
local microclimates covers what one yard in Pavillion can differ from the 82516 normal. zone vs. frost date covers why Zone 5a and Pavillion's frost date answer different questions.