McCully Basin is a popular area for backcountry skiers in the Wallowas. It attracts overnight visitors because it is home to Wallowa Alpine Huts' McCully Camp, but it's relatively short approach makes day trips feasible.
Wallowa Alpine Huts also offers guide services for first timers in the area. These are well worth the cost and add a fair amount of safety to your trip.
The approach is easy to follow and has only one switchback. Once you've reached the basin, there is great low-angle skiing on the west side of the basin and bigger lines for advanced skiers off of Aneroid Peak.
Winter backcountry adventures can be dangerous outdoor activities that pose significant risks as conditions affecting safety (i.e. weather, snowpack stability, avalanche hazard) are constantly changing. Prior to engaging in these activities each individual should get the proper training to make safe decisions and be equipped to use avalanche safety resources and tools. Please visit our Backcountry Skiing and Avalanche Safety post to learn more.