Alma, MI 48830 Frost Dates
Frost dates for Alma, MI, ZIP 48830
Around 05/01 is the usual last spring frost, about 246 days away. The first fall frost typically arrives around 10/13, about 164 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 Alma, not a forecast for this year.
What to do before the first frost
Zone 6a around Alma 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
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 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 Alma compares
At roughly 164 frost-free days, Alma places 30,882 of 40,283 ZIP codes in this dataset. Within MI, it ranks 474 of 1,153.
Learn more
the frost range explains how to read the range around Alma's dates instead of trusting one, and local microclimates explains what one yard in Alma can differ from the 48830 normal.