Negaunee, MI 49866 Frost Dates
49866, near Negaunee, MI: the frost window
Typically, the last spring freeze lands around 05/22, roughly 267 days out. Fall's first freeze usually shows up around 09/29, roughly 129 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Negaunee in Zone 4b (-25 to -20°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
Negaunee's growing season runs out in roughly 5 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
05/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/04 and only about 1 year in 10 sees frost after that.
Negaunee against the rest of the dataset
About 129 days separate Negaunee's last and first frost, putting it 38,457 of 40,283 ZIP codes nationally. Within MI, it ranks 1,038 of 1,153.
Learn more
Two guides worth reading on 49866: zone vs. frost date, on why Zone 4b and Negaunee's frost date answer different questions, and the frost range, on how to read the range around Negaunee's dates instead of trusting one.