If your refering to Clakum[sp] Pass ,thats from Ellensburg to Wenachee ,we went during hunting season last year,just enough snow to give a little challenge, Dry weather easy all roads.
Ellensburg to Selah ,not by the canyon hwy ,there is a single track road that is a challenge when wet,mud and ruts steep long climbs ,depends how much snow that far east if passable or not, you look down on the Yakima River and accross at part of the Army`s Yakima Play area.
All areas are about the same once you hit deep snow ,Just in eastern wa. you don`t get rained on while playing in the snow.
I`ve played by Easton and Lake easton, ran some of the power line area in 1 to 1.5 ft of snow .when it gets deeper and some of the roads are plowed ,can`t get off the road to play.
So ,depends on what your looking for and what distance you want to drive.
If you make it up Hollor Pass [greenwater area] you then can try for the lake at the end of the road ,there is a restroom .I took Phil there once.