The Summit - Two Sno Park areas are available, but a Sno-Park pass is
required.  They include Gold Creek on the North side of I-90, and Hyak - located on
the south side of I-90.  (Sledding, snowshoeing, etc.).  Dogs are not permitted at
the Hyak Sno-Park.

Blewett Pass - Swauk Campground offers Snowshoeing and plenty of
non-motorized snow fun.  A Sno-Park pass is required.
Information and Local Resources

NW Weather and  Avalanche
Center

DOT TRAFFIC ALERTS

Statewide Traffic Cameras
Snow Play
Sno-Park passes and Snowmobile registration tags are strictly
enforced.  Don't ruin your visit by getting an expensive citation.  
Remember your passes.