Kingsford, MI 49802 Frost Dates
Frost dates for Kingsford, MI, ZIP 49802
Around 05/17 is the usual last spring frost, about 262 days away. The first fall frost typically arrives around 10/01, about 135 frost-free days later.
Zone 4b (-25 to -20°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 Kingsford, not a forecast for this year.
What to do before the first frost
Zone 4b around Kingsford has about 5 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
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Kingsford compares
About 135 days separate Kingsford's last and first frost, putting it 37,848 of 40,283 ZIP codes nationally. Within MI, it ranks 962 of 1,153.
Learn more
local microclimates explains what one yard in Kingsford can differ from the 49802 normal, and zone vs. frost date explains why Zone 4b and Kingsford's frost date answer different questions.