Harrietta, MI 49638 Frost Dates
When can you plant in Harrietta, MI?
The last spring frost here typically falls around 05/28, about 273 days from today. The first fall frost typically arrives around 09/25, about 119 frost-free days later.
Zone 5b (-15 to -10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Harrietta, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Harrietta before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Harrietta's last frost
05/28 is the middle of 30 years of NOAA records, not a promise. Plant by 05/13 and you're betting against frost in roughly 9 years out of 10. 06/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Harrietta compares
About 119 days separate Harrietta's last and first frost, putting it 39,186 of 40,283 ZIP codes nationally. Within MI, it ranks 1,113 of 1,153.
Learn more
the frost range covers how to read the range around Harrietta's dates instead of trusting one. local microclimates covers what one yard in Harrietta can differ from the 49638 normal.