Houghton, MI 49922 Frost Dates
Frost dates for Houghton, MI, ZIP 49922
Around 05/17 is the usual last spring frost, about 262 days away. The first fall frost typically arrives around 10/01, about 138 frost-free days later.
The USDA Plant Hardiness Zone Map puts Houghton in Zone 5b (-15 to -10°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 5b around Houghton 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.
The actual range around Houghton's last frost
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/01 and you're betting against frost in roughly 9 years out of 10. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Houghton compares
About 138 days separate Houghton's last and first frost, putting it 37,373 of 40,283 ZIP codes nationally. Within MI, it ranks 921 of 1,153.
Learn more
the frost range explains how to read the range around Houghton's dates instead of trusting one, and local microclimates explains what one yard in Houghton can differ from the 49922 normal.