Marshall, MI 49033 Frost Dates
49033, near Marshall, MI: the frost window
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/19, roughly 170 days after the last spring frost.
Marshall 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
Marshall'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 04/30 isn't a guarantee
04/30 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 05/17 and only about 1 year in 10 sees frost after that.
Marshall against the rest of the dataset
About 170 days separate Marshall's last and first frost, putting it 28,962 of 40,283 ZIP codes nationally. Within MI, it ranks 311 of 1,153.
Learn more
Two guides worth reading on 49033: the frost range, on how to read the range around Marshall's dates instead of trusting one, and local microclimates, on what one yard in Marshall can differ from the 49033 normal.