Norway, MI 49870 Frost Dates
When can you plant in Norway, MI?
Around 05/17 is the usual last spring frost, about 262 days away. The first fall frost typically arrives around 10/01, about 135 frost-free days later.
The USDA Plant Hardiness Zone Map puts Norway in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 5 weeks of growing season left in Norway before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/17 isn't a guarantee
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 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 Norway compares
About 135 days separate Norway's last and first frost, putting it 37,867 of 40,283 ZIP codes nationally. Within MI, it ranks 973 of 1,153.
Learn more
zone vs. frost date covers why Zone 4b and Norway's frost date answer different questions. the frost range covers how to read the range around Norway's dates instead of trusting one.