Jonesville, MI 49250 Frost Dates
49250, near Jonesville, MI: the frost window
The last spring frost here typically falls around 05/03, about 248 days from today. Fall's first freeze usually shows up around 10/12, roughly 161 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 Jonesville, not a forecast for this year.
Stretching the season past the first frost
Jonesville'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 Jonesville's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 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.
Jonesville against the rest of the dataset
About 161 days separate Jonesville's last and first frost, putting it 32,066 of 40,283 ZIP codes nationally. Within MI, it ranks 572 of 1,153.
Learn more
Two guides worth reading on 49250: the frost range, on how to read the range around Jonesville's dates instead of trusting one, and local microclimates, on what one yard in Jonesville can differ from the 49250 normal.