Brighton, MI 48139 Frost Dates
When can you plant in Brighton, MI?
The last spring frost here typically falls around 05/05, about 250 days from today. The first fall frost typically arrives around 10/13, about 160 frost-free days later.
Brighton sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 7 weeks of growing season left in Brighton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Brighton compares
Brighton's growing season runs about 160 days, ranking 32,286 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 622 of 1,153.
Learn more
the frost range covers how to read the range around Brighton's dates instead of trusting one. local microclimates covers what one yard in Brighton can differ from the 48139 normal.