Decatur, MI 49045 Frost Dates
When can you plant in Decatur, MI?
The last spring frost here typically falls around 05/04, about 249 days from today. The first fall frost typically arrives around 10/11, about 158 frost-free days later.
The USDA Plant Hardiness Zone Map puts Decatur 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
About 6 weeks of growing season left in Decatur before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Decatur's last frost
05/04 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Decatur compares
At roughly 158 frost-free days, Decatur places 33,019 of 40,283 ZIP codes in this dataset. Within MI, it ranks 667 of 1,153.
Learn more
the frost range covers how to read the range around Decatur's dates instead of trusting one. local microclimates covers what one yard in Decatur can differ from the 49045 normal.