I also live in michigan and during my first outdoor grow 3 years had some problems with this. I didnt let my holes sit and loss about ten plants due to animals digging in the fresh soil. I ended up being able to save 3 of them plus the ones that didnt get dug up. Since i didnt use any bloodmeal or bone meal or anything like that i did some research on it. Apparently some animals are attracted to the smell of fresh soil in the search for small animals or grubs. IMO and as stated above let ur holes sit for a week or two if time allows and u shouldnt have any problems. Also try not to dig more than you have to when transplanting ur plants to minimize the odor of the soil. I use Fox Farm's Ocean Forest potting soil, bleach in water bottles, Irish springs soap, and also put chicken wire around each plant. Hope this helps and good luck.