Alanson, MI 49706 Frost Dates
When can you plant in Alanson, MI?
The last spring frost here typically falls around 05/31, about 276 days from today. The first fall frost typically arrives around 09/18, about 108 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 Alanson, not a forecast for this year.
What to do before the first frost
About 3 weeks of growing season left in Alanson before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/31 isn't a guarantee
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/16 and you're betting against frost in roughly 9 years out of 10. 06/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Alanson compares
At roughly 108 frost-free days, Alanson places 39,546 of 40,283 ZIP codes in this dataset. Within MI, it ranks 1,134 of 1,153.
Learn more
zone vs. frost date covers why Zone 5a and Alanson's frost date answer different questions. the frost range covers how to read the range around Alanson's dates instead of trusting one.