Travel out to the Rockies to find reliable snow in the West (duh) or to lake-effect positions ski resorts in the East to find the white stuff.
The placement of the big Utah resorts ?? Snowbird, Alta, Deer Valley, Park City, The Canyons and Solitude ?? seems to increase the chances of them receiving good snow. In Colorado, several ski resorts such as Keystone, Winter Park and Breckenridge are situated at such high altitudes that quality natural snow can usually be found at just about any time during the season.
Family Travel [via Family Ski Resorts] recommends Cockaigne in New York and Grand Targhee in Wyoming for skiing with less frills. Out in the DC area? Try Wisp. You can get the snow statistics and average conditions on anywhere you decide to go with by making online ski/snowboard preparations.
[photo by: khuasi]