shoshone (class 3) and south canyon (class 2) on the colorado run year-round. The lower blue (class 2+/3-) sometimes runs into october. Waterton (class 3+) on the south platte may still be running too. Dunno about any harder runs.
black canyon and gunni gorge maybe going outside of montrose. also Gore canyon and bailey near denver. best bet would be to stay in OR for some paddling but i guess you guys haven't had much of a season.