Sault Ste. Marie, MI 49774 Frost Dates
When can you plant in Sault Ste. Marie, MI?
Around 05/31 is the usual last spring frost, about 276 days away. The first fall frost typically arrives around 09/25, about 116 frost-free days later.
Sault Ste. Marie sits in USDA Zone 4b (-25 to -20°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 4 weeks of growing season left in Sault Ste. Marie before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/31 isn't a guarantee
05/31 is the middle of 30 years of NOAA records, not a promise. Plant by 05/14 and you're betting against frost in roughly 9 years out of 10. 06/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sault Ste. Marie compares
At roughly 116 frost-free days, Sault Ste. Marie places 39,275 of 40,283 ZIP codes in this dataset. Within MI, it ranks 1,118 of 1,153.
Learn more
the frost range covers how to read the range around Sault Ste. Marie's dates instead of trusting one. local microclimates covers what one yard in Sault Ste. Marie can differ from the 49774 normal.