Luther, MI 49656 Frost Dates
When can you plant in Luther, MI?
Typically, the last spring freeze lands around 05/28, roughly 273 days out. The first fall frost typically arrives around 09/25, about 119 frost-free days later.
Zone 5a (-20 to -15°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 Luther, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Luther before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Luther'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 Luther compares
About 119 days separate Luther's last and first frost, putting it 39,170 of 40,283 ZIP codes nationally. Within MI, it ranks 1,108 of 1,153.
Learn more
local microclimates covers what one yard in Luther can differ from the 49656 normal. zone vs. frost date covers why Zone 5a and Luther's frost date answer different questions.