Marion, MI 49665 Frost Dates
When can you plant in Marion, MI?
Around 05/22 is the usual last spring frost, about 267 days away. The first fall frost typically arrives around 09/26, about 125 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 Marion, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Marion before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/22 isn't a guarantee
05/22 is the middle of 30 years of NOAA records, not a promise. Plant by 05/08 and you're betting against frost in roughly 9 years out of 10. 06/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Marion compares
At roughly 125 frost-free days, Marion places 38,782 of 40,283 ZIP codes in this dataset. Within MI, it ranks 1,080 of 1,153.
Learn more
the frost range covers how to read the range around Marion's dates instead of trusting one. local microclimates covers what one yard in Marion can differ from the 49665 normal.