Manderson, WY 82432 Frost Dates
When can you plant in Manderson, WY?
Around 04/28 is the usual last spring frost, about 243 days away. The first fall frost typically arrives around 10/10, about 164 frost-free days later.
The USDA Plant Hardiness Zone Map puts Manderson 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 6 weeks of growing season left in Manderson 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 Manderson compares
About 164 days separate Manderson's last and first frost, putting it 31,254 of 40,283 ZIP codes nationally. Within WY, it ranks 2 of 192.
Learn more
zone vs. frost date covers why Zone 4b and Manderson's frost date answer different questions. the frost range covers how to read the range around Manderson's dates instead of trusting one.