Its official in the Grans Rapids area. First frost on October 12, 2012. There is still some frozen rain on my car.
And the official records from the nearest automated weather station.
Weather station shows a soil temperature at 2 inches deep of 53 degrees.
I walked around a bit on my grass while setting a mole trap. The grass had a distinct, stiff frozen feel to it. I will check later to see if I get any frost tracks.
Maybe it will help my wife's allergies.