Trenton, MI 48138 Frost Dates
Frost dates for Trenton, MI, ZIP 48138
The last spring frost here typically falls around 04/20, about 235 days from today. The first fall frost typically arrives around 10/27, about 188 frost-free days later.
The USDA Plant Hardiness Zone Map puts Trenton 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 Trenton has about 9 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.
The actual range around Trenton's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Trenton compares
At roughly 188 frost-free days, Trenton places 21,883 of 40,283 ZIP codes in this dataset. Within MI, it ranks 53 of 1,153.
Learn more
zone vs. frost date explains why Zone 6b and Trenton's frost date answer different questions, and the frost range explains how to read the range around Trenton's dates instead of trusting one.