Clawson, MI 48017 Frost Dates
Clawson, MI: when does the frost end?
Typically, the last spring freeze lands around 04/21, roughly 236 days out. Fall's first freeze usually shows up around 10/31, roughly 190 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Clawson in Zone 6b (-5 to 0°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 9 weeks until Clawson's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/21 isn't a guarantee
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Clawson against the rest of the dataset
Clawson's growing season runs about 190 days, ranking 21,089 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 33 of 1,153.
Learn more
Before leaning on 48017's figures: zone vs. frost date explains why Zone 6b and Clawson's frost date answer different questions, while the frost range explains how to read the range around Clawson's dates instead of trusting one.