There's skiing, skating, and snowboarding. There's information about all sorts of winter sports. Like bobsledding, ski jumping, and figure skating. If you're not sure how a game is played, you can find out here. You can also find out about competitions and the history of different kinds of winter sports.
Hockey is probably one of the most popular winter sports.
For older kids, there are a few sites that you can check out that give some great information about hockey, from past to present. There are statistics and lots of information about the teams. You can find statistics as well as schedules and standings. It is a detailed site about hockey in the United States including schedules, information for parents, and rules of the sport. There's a winter sport that you might not have heard a lot about.