Saginaw, MI 48601 Frost Dates
48601, near Saginaw, MI: the frost window
Around 04/29 is the usual last spring frost, about 244 days away. Fall's first freeze usually shows up around 10/21, roughly 175 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Saginaw 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
Saginaw's growing season runs out in roughly 8 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 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Saginaw against the rest of the dataset
Saginaw's growing season runs about 175 days, ranking 26,744 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 127 of 1,153.
Learn more
Two guides worth reading on 48601: local microclimates, on what one yard in Saginaw can differ from the 48601 normal, and zone vs. frost date, on why Zone 6a and Saginaw's frost date answer different questions.