St. Ignace, MI 49781 Frost Dates
When can you plant in St. Ignace, MI?
Around 05/16 is the usual last spring frost, about 261 days away. The first fall frost typically arrives around 10/13, about 149 frost-free days later.
St. Ignace sits in USDA Zone 5b (-15 to -10°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 St. Ignace 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
05/16 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Ignace compares
At roughly 149 frost-free days, St. Ignace places 35,528 of 40,283 ZIP codes in this dataset. Within MI, it ranks 826 of 1,153.
Learn more
zone vs. frost date covers why Zone 5b and St. Ignace's frost date answer different questions. the frost range covers how to read the range around St. Ignace's dates instead of trusting one.