Port Huron, MI 48060 Frost Dates
Frost dates for Port Huron, MI, ZIP 48060
The last spring frost here typically falls around 04/19, about 234 days from today. The first fall frost typically arrives around 11/03, about 196 frost-free days later.
The USDA Plant Hardiness Zone Map puts Port Huron in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6b around Port Huron has about 10 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
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Port Huron compares
At roughly 196 frost-free days, Port Huron places 18,916 of 40,283 ZIP codes in this dataset. Within MI, it ranks 6 of 1,153.
Learn more
zone vs. frost date explains why Zone 6b and Port Huron's frost date answer different questions, and the frost range explains how to read the range around Port Huron's dates instead of trusting one.