Lake Ann, MI 49637 Frost Dates
Frost dates for Lake Ann, MI, ZIP 49637
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 10/15, about 156 frost-free days later.
The USDA Plant Hardiness Zone Map puts Lake Ann in Zone 6a (-10 to -5°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
Zone 6a around Lake Ann has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 and you're betting against frost in roughly 9 years out of 10. 05/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lake Ann compares
Lake Ann's growing season runs about 156 days, ranking 33,833 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 760 of 1,153.
Learn more
local microclimates explains what one yard in Lake Ann can differ from the 49637 normal, and zone vs. frost date explains why Zone 6a and Lake Ann's frost date answer different questions.