Lennon, MI 48449 Frost Dates
48449, near Lennon, MI: the frost window
Around 05/03 is the usual last spring frost, about 248 days away. Fall's first freeze usually shows up around 10/11, roughly 159 days after the last spring frost.
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 Lennon, not a forecast for this year.
Stretching the season past the first frost
Lennon's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Lennon's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
Lennon against the rest of the dataset
At roughly 159 frost-free days, Lennon places 32,739 of 40,283 ZIP codes in this dataset. Within MI, it ranks 658 of 1,153.
Learn more
Two guides worth reading on 48449: zone vs. frost date, on why Zone 6a and Lennon's frost date answer different questions, and the frost range, on how to read the range around Lennon's dates instead of trusting one.