Shooting for February or March. But if you want to camp on a dogsledding trip, there certainly are people out there who would love to take you out on their sled for a few days. I suggest taking a trip up to northeastern Minnesota, specifically the Boundary Waters, Gunflint Trail, or Ely areas. All three offer great dogsledding trips through breath-taking deciduous forests and frozen lakes. You'll find the locals to be a hardy, honest, and able bunch, who love to be outside and have a good time.
Few things are more rewarding than relaxing in a sauna after a long day on the sled.
As your guides will surely explain, the importance of warm clothing can't be over-emphasized. Avoid cotton, for starters, and stock up on wool, polyester and other good cold-weather layers. Good boots are also a must. If you're in the market to get a new pair of winter boots, try Steger mukluks. Styled after footwear originated by northern Native Americans, they're made with moosehide and an incredibly warm felt liner.