Pavillion, WY 82523 Frost Dates
When can you plant in Pavillion, WY?
Typically, the last spring freeze lands around 05/16, roughly 261 days out. 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.
How much risk comes with planting early here
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
Pavillion's growing season runs about 133 days, ranking 38,138 of 40,283 US ZIP codes measured here, longest to shortest. Within WY, it ranks 56 of 192.
Learn more
local microclimates covers what one yard in Pavillion can differ from the 82523 normal. zone vs. frost date covers why Zone 5a and Pavillion's frost date answer different questions.