Fox and Snowbirds
This game features a lively game of tag, where one person is the fox and at least three other players are the snowbirds. Before the game, players must stamp out a wagon wheel shape into the snow---a center spot and six to eight spokes leading out to a larger circle (about 20 feet across). The fox begins in the center spot while the snowbirds line the outer circle. When the game starts, the fox starts to chase the snowbirds along the wheel lines. The snowbirds try to make their way to the center spot to be considered "safe." When the fox tags another player, that player becomes the new fox.
Winter Rainbow Scavenger Hunt
This winter scavenger hunt can occupy players for a long time. A few hours before the party, prepare several ice cube trays filled with water and a few drops of food coloring. Prepare one ice cube tray per team, with each tray featuring a different color. Hide the ice cubes outside in the yard without players seeing you. When it's time to begin the scavenger hunt, give each team an empty ice cube tray and let them start looking for cubes in their team's color. The first team to bring back a full ice cube tray with the right color of cubes is the winner.
Tic-Tac-Toe in the Snow
Create a traditional tic-tac-toe board in a section of untouched snow by drawing the grid with a long stick. Use winter items for the "X" markers, such as two crossed sticks, and the "O" markers, such as pinecones. Play the game as usual. Whenever someone wins the game, the losing player goes first next time.
Snow Hurdle Relay
Prepare a series of hurdles made out of snow. Pack a mopping bucket full of snow, then carefully overturn it. Make six to eight hurdles about 2 feet apart. When the race begins, the first person must jump over each hurdle, then work his way back. It's much harder than it looks when the racers are all bundled up in winter clothes. The racer then tags the next player in line, and so on until everyone has had a turn. For variation, prepare two courses so two teams can race each other.