Chatham, MI 49826 Frost Dates
Chatham, MI: when does the frost end?
Around 05/30 is the usual last spring frost, about 275 days away. Fall's first freeze usually shows up around 09/27, roughly 119 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Chatham in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 4 weeks until Chatham's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Chatham's last frost
05/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/21 and only about 1 year in 10 sees frost after that.
Chatham against the rest of the dataset
About 119 days separate Chatham's last and first frost, putting it 39,181 of 40,283 ZIP codes nationally. Within MI, it ranks 1,112 of 1,153.
Learn more
Before leaning on 49826's figures: the frost range explains how to read the range around Chatham's dates instead of trusting one, while local microclimates explains what one yard in Chatham can differ from the 49826 normal.