Custer, MI 49458 Frost Dates
When can you plant in Custer, MI?
The last spring frost here typically falls around 05/17, about 262 days from today. The first fall frost typically arrives around 10/07, about 144 frost-free days later.
Zone 6a (-10 to -5°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 Custer, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Custer before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Custer compares
Custer's growing season runs about 144 days, ranking 36,461 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 887 of 1,153.
Learn more
local microclimates covers what one yard in Custer can differ from the 49458 normal. zone vs. frost date covers why Zone 6a and Custer's frost date answer different questions.