Rochester Hills, MI 48309 Frost Dates
When can you plant in Rochester Hills, MI?
Around 04/29 is the usual last spring frost, about 244 days away. The first fall frost typically arrives around 10/20, about 172 frost-free days later.
The USDA Plant Hardiness Zone Map puts Rochester Hills in Zone 6a (-10 to -5°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
About 8 weeks of growing season left in Rochester Hills before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rochester Hills compares
At roughly 172 frost-free days, Rochester Hills places 28,136 of 40,283 ZIP codes in this dataset. Within MI, it ranks 245 of 1,153.
Learn more
the frost range covers how to read the range around Rochester Hills's dates instead of trusting one. local microclimates covers what one yard in Rochester Hills can differ from the 48309 normal.