Rose City, MI 48636 Frost Dates
Frost dates for Rose City, MI, ZIP 48636
Around 05/19 is the usual last spring frost, about 264 days away. The first fall frost typically arrives around 10/02, about 136 frost-free days later.
Rose City sits in USDA Zone 5a (-20 to -15°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 5a around Rose City has about 5 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.
The actual range around Rose City's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Plant by 05/01 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rose City compares
Rose City's growing season runs about 136 days, ranking 37,750 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 956 of 1,153.
Learn more
zone vs. frost date explains why Zone 5a and Rose City's frost date answer different questions, and the frost range explains how to read the range around Rose City's dates instead of trusting one.