Basin, WY 82410 Frost Dates
When can you plant in Basin, WY?
The last spring frost here typically falls around 04/28, about 243 days from today. The first fall frost typically arrives around 10/10, about 164 frost-free days later.
Basin sits in USDA Zone 4b (-25 to -20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 6 weeks of growing season left in Basin before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Basin compares
About 164 days separate Basin's last and first frost, putting it 31,031 of 40,283 ZIP codes nationally. Within WY, it ranks 1 of 192.
Learn more
local microclimates covers what one yard in Basin can differ from the 82410 normal. zone vs. frost date covers why Zone 4b and Basin's frost date answer different questions.