If you are going to Washington anyway, it might be worth bringing Ice gear just in case something is in. But if you are planning an ice trip I would choose:
1. Banff, Alberta
2. Cody, Wy
3. Lilooet, BC (check conditions)
4. Bozeman, Mt.
5. Somewhere, Colorado
6. Lee Vining, Ca
7. Washington
in that order...