Rockford, MI 49306 Frost Dates
Frost dates for Rockford, MI, ZIP 49306
The last spring frost here typically falls around 05/06, about 251 days from today. The first fall frost typically arrives around 10/10, about 157 frost-free days later.
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 Rockford, not a forecast for this year.
What to do before the first frost
Zone 6a around Rockford has about 6 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 Rockford's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rockford compares
Rockford's growing season runs about 157 days, ranking 33,302 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 725 of 1,153.
Learn more
local microclimates explains what one yard in Rockford can differ from the 49306 normal, and zone vs. frost date explains why Zone 6a and Rockford's frost date answer different questions.