Harrisville, MI 48740 Frost Dates
When can you plant in Harrisville, MI?
The last spring frost here typically falls around 05/08, about 253 days from today. The first fall frost typically arrives around 10/16, about 160 frost-free days later.
Harrisville 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 Harrisville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/08 isn't a guarantee
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 and you're betting against frost in roughly 9 years out of 10. 05/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Harrisville compares
About 160 days separate Harrisville's last and first frost, putting it 32,491 of 40,283 ZIP codes nationally. Within MI, it ranks 644 of 1,153.
Learn more
the frost range covers how to read the range around Harrisville's dates instead of trusting one. local microclimates covers what one yard in Harrisville can differ from the 48740 normal.