Keystone, CO - Rooms & Rates
As part of its annual Kidtopia festival, the Keystone Resort builds a massive, 12-foot-high snow castle (pictured above). And it's not just for show. Kids can play on and around the fortress of dreamy frostitude, which includes a maze, slide and lookout tower. Other cool kid activities on Keystone's Dercum Mountain include disco tubing at night (reservations required) and the Glow Bug Skate Night, where kids can don glow-in-the-dark gear to beam around the outdoor ice rink like fireflies.
Squaw Valley USA
Olympic Valley, CA - More Details
Although you might not find another snow fort as massive as Keystone's, Squaw Valley is upping the freeze-fun with SnoVentures, a kid-friendly snow park debuting for the 2011-2012 season. In addition to snow tubing, kids will be able to ride mini-snowmobiles (pictured left) through a just-their-size snowcourse.