Mason, MI 48918 Frost Dates
When can you plant in Mason, MI?
Around 04/28 is the usual last spring frost, about 243 days away. The first fall frost typically arrives around 10/17, about 173 frost-free days later.
Mason 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.
What to do before the first frost
About 7 weeks of growing season left in Mason before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/13 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mason compares
About 173 days separate Mason's last and first frost, putting it 27,827 of 40,283 ZIP codes nationally. Within MI, it ranks 218 of 1,153.
Learn more
zone vs. frost date covers why Zone 6a and Mason's frost date answer different questions. the frost range covers how to read the range around Mason's dates instead of trusting one.