Sanford, MI 48686 Frost Dates
48686, near Sanford, MI: the frost window
Typically, the last spring freeze lands around 04/29, roughly 244 days out. Fall's first freeze usually shows up around 10/16, roughly 167 days after the last spring frost.
Sanford sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Sanford's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Sanford against the rest of the dataset
At roughly 167 frost-free days, Sanford places 30,105 of 40,283 ZIP codes in this dataset. Within MI, it ranks 375 of 1,153.
Learn more
Two guides worth reading on 48686: the frost range, on how to read the range around Sanford's dates instead of trusting one, and local microclimates, on what one yard in Sanford can differ from the 48686 normal.