The largest ski resort in North America, which sprawls 8,000-plus acres over two mountains with more than 5,000 feet of vertical (second only to BCs Revelstoke), turns up the partying in springtime. Whistler has better spring conditions into June, thanks to its north-facing bowls and upper mountain terrain, but Blackcomb takes over in summer, when it operates 700 vertical feet of glacier on T-bars.