Here’s a place to start looking for ski resorts in the Mid-Atlantic: New York, Pennsylvania, and New Jersey.
New Jersey
Campgaw (Mahwah)
Mountain Creek (Vernon)
New York State (Google Earth)
Western New York: Rochester
Brantling (Sodus)
Bristol Mountain (Canandaigua)
Buffalo Ski Club (Orchard Park)
Cockaigne (Cherry Creek; closed as of 2011)
Kissing Bridge (Glenwood)
Holiday Valley (Ellicottville)
HoliMont Ski Area (Ellicottville; private club)
Hunt Hollow (Dansville; private club)
Peek N’Peak (Clymer)
Swain (Swain)
Western New York: Syracuse area
Dry Hill (Watertown)
Four Seasons (Fayetteville)
Greek Peak (Cortland)
Labrador Mountain (Truxton)
Snow Ridge (Turin)
Song Mountain (Tully)
Toggenburg Mountain (Fabius)
Northern New York
Gore Mountain (North Creek)
Maple Ski Ridge (Schenectady)
Royal Mountain (Caroga Lake)
Titus Mountain (Malone)
West Mountain (Glen Falls)
Whiteface Mountain (Lake Placid)
Williard Mountain (Greenwich)
Woods Valley (Westernville)
Southern New York
Belleayre (Highmount)
Catamount (Egremont, MA)
Holiday Mountain (Monticello)
Hunter Mountain (Hunter)
Mt. Peter (Warwick)
Plattekill (Roxbury)
Saw Kill (Kingston)
Thunder Ridge (Patterson)
Windham Mountain (Windham)
Pennsylvania
Eastern PA
Alpine Mountain (Analomink)
Bear Creek (Macungie)
Big Bear (Lackawaxen)
Big Boulder / Jack Frost (Lake Harmony and Blakslee)
Blue Mountain (Palmerton)
Camelback (Tannersville)
Eagle Rock (Hazleton)
Elk Mountain (Union Dale)
Spring Mountain (Spring Mount)
Central and Western PA
Blue Knob (Claysburg)
Denton (Denton Hill; note: Closed as of the 2014-2015 season)
Hidden Valley (Hidden Valley)
Liberty Mountain (Carroll Valley)
Seven Springs (Champion)
Ski Roundtop (Lewisberry)
Ski Sawmill (Morris)
Tussey Mountain (Boalsburg)
Whitetail (Mercersburg)