Pinckney, MI 48143 Frost Dates
Pinckney, MI: when does the frost end?
Typically, the last spring freeze lands around 05/05, roughly 250 days out. Fall's first freeze usually shows up around 10/13, roughly 160 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 Pinckney, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Pinckney's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Pinckney against the rest of the dataset
About 160 days separate Pinckney's last and first frost, putting it 32,378 of 40,283 ZIP codes nationally. Within MI, it ranks 633 of 1,153.
Learn more
Before leaning on 48143's figures: zone vs. frost date explains why Zone 6a and Pinckney's frost date answer different questions, while the frost range explains how to read the range around Pinckney's dates instead of trusting one.