Martin, MI 49070 Frost Dates
Martin, MI: when does the frost end?
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/15, roughly 160 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Martin 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
With roughly 7 weeks until Martin's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/04 isn't a guarantee
05/04 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 05/22 and only about 1 year in 10 sees frost after that.
Martin against the rest of the dataset
Martin's growing season runs about 160 days, ranking 32,500 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 645 of 1,153.
Learn more
Before leaning on 49070's figures: local microclimates explains what one yard in Martin can differ from the 49070 normal, while zone vs. frost date explains why Zone 6a and Martin's frost date answer different questions.