Approach

To access both the Cold Fusion and Grunge couloirs make your up the Bear Canyon trail (a well packed fat bike trail) until it ends. From here you will be standing below a massive wall of the North Timpanogos Peak. Cross the huge avalanche path. You'll need to skin over a small knoll. Here you will be at the bottom of the Cold Fusion couloir. Skin up the couloir until it gets too steep. Strap your boards to your pack and begin the bootpack. Boot all the way up to the top of the Cold Fusion couloir and ski down.

To get to the Grunge Couloir

Continue booting up Cold Fusion ridge. When you reach the top, it'll flatten out. Traverse a little further and you'll be at it.