Allen, MI 49227 Frost Dates
When can you plant in Allen, MI?
Typically, the last spring freeze lands around 05/03, roughly 248 days out. The first fall frost typically arrives around 10/12, about 161 frost-free days later.
Zone 6a (-10 to -5°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 Allen, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Allen before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Allen compares
About 161 days separate Allen's last and first frost, putting it 32,172 of 40,283 ZIP codes nationally. Within MI, it ranks 612 of 1,153.
Learn more
local microclimates covers what one yard in Allen can differ from the 49227 normal. zone vs. frost date covers why Zone 6a and Allen's frost date answer different questions.