I may have to resort to hiring a car - thumbing lifts has worked marvelously well so far, but I'll never know when my luck will run out.
Hell's Canyon might be a long way off, but it's in the right direction for getting me towards Vancouver. So too would be the Sawtooth range, but that's snowy bear country.
My biggest worry with many locations out here is bears and other scarey wildlife - issues better not faced on one's own. Again, I'm equipped for snow, but out there alone the risks are multiplied. Ryan suggested that the Teton Crest may still be an option, but not once heavy snow has fallen and not alone.