Crystal Falls, MI 49815 Frost Dates
Frost dates for Crystal Falls, MI, ZIP 49815
Around 06/06 is the usual last spring frost, about 282 days away. The first fall frost typically arrives around 09/09, about 94 frost-free days later.
Crystal Falls sits in USDA Zone 4b (-25 to -20°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
Zone 4b around Crystal Falls has about 2 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
06/06 is the middle of 30 years of NOAA records, not a promise. Plant by 05/23 and you're betting against frost in roughly 9 years out of 10. 07/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Crystal Falls compares
At roughly 94 frost-free days, Crystal Falls places 39,832 of 40,283 ZIP codes in this dataset. Within MI, it ranks 1,149 of 1,153.
Learn more
local microclimates explains what one yard in Crystal Falls can differ from the 49815 normal, and zone vs. frost date explains why Zone 4b and Crystal Falls's frost date answer different questions.