Fennville, MI 49450 Frost Dates
49450, near Fennville, MI: the frost window
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/11, roughly 156 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Fennville 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
Fennville'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.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Fennville against the rest of the dataset
Fennville's growing season runs about 156 days, ranking 33,678 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 747 of 1,153.
Learn more
Two guides worth reading on 49450: local microclimates, on what one yard in Fennville can differ from the 49450 normal, and zone vs. frost date, on why Zone 6a and Fennville's frost date answer different questions.