Snow is the number one reason why I recommend putting small coops on legs. One less thing to dig out every day. Once a week isn't such a big deal, but every day? No thanks.
Couple things about these:
1. The numbers of people unhappy with these far and away outnumber the people who are happy with them. The vast majority of the time they leak/fall apart in anything but the driest of climates.
2. You're going to HATE not having a run you can stand up in, sooner...