Port Huron, MI 48049 Frost Dates
Port Huron, MI: when does the frost end?
The last spring frost here typically falls around 04/19, about 234 days from today. Fall's first freeze usually shows up around 11/03, roughly 196 days after the last spring frost.
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 Port Huron, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Port Huron's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/04 and only about 1 year in 10 sees frost after that.
Port Huron against the rest of the dataset
Port Huron's growing season runs about 196 days, ranking 18,914 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 4 of 1,153.
Learn more
Before leaning on 48049's figures: local microclimates explains what one yard in Port Huron can differ from the 48049 normal, while zone vs. frost date explains why Zone 6a and Port Huron's frost date answer different questions.