Niles, MI 49120 Frost Dates
49120, near Niles, MI: the frost window
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/25, roughly 180 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Niles in Zone 6a (-10 to -5°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
Niles's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Niles against the rest of the dataset
At roughly 180 frost-free days, Niles places 24,814 of 40,283 ZIP codes in this dataset. Within MI, it ranks 84 of 1,153.
Learn more
Two guides worth reading on 49120: zone vs. frost date, on why Zone 6a and Niles's frost date answer different questions, and the frost range, on how to read the range around Niles's dates instead of trusting one.