Pierson, MI 49339 Frost Dates
When can you plant in Pierson, MI?
The last spring frost here typically falls around 05/18, about 263 days from today. The first fall frost typically arrives around 09/28, about 133 frost-free days later.
Zone 5b (-15 to -10°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 Pierson, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Pierson before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/18 isn't a guarantee
05/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/29 and you're betting against frost in roughly 9 years out of 10. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pierson compares
At roughly 133 frost-free days, Pierson places 38,140 of 40,283 ZIP codes in this dataset. Within MI, it ranks 1,017 of 1,153.
Learn more
local microclimates covers what one yard in Pierson can differ from the 49339 normal. zone vs. frost date covers why Zone 5b and Pierson's frost date answer different questions.