Cass City, MI 48426 Frost Dates
Frost dates for Cass City, MI, ZIP 48426
The last spring frost here typically falls around 05/07, about 252 days from today. The first fall frost typically arrives around 10/10, about 152 frost-free days later.
Cass City 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
Zone 6a around Cass City has about 6 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cass City compares
Cass City's growing season runs about 152 days, ranking 34,768 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 803 of 1,153.
Learn more
zone vs. frost date explains why Zone 6a and Cass City's frost date answer different questions, and the frost range explains how to read the range around Cass City's dates instead of trusting one.