I've done Ruby and Cataract at Thanksgiving, the Goosenecks on the San Juan over Christmas and the Upper San Juan in January. Just watch the weather and get beta about ice dams before making plans, but these sections are less likely to freeze than some others.
I've done ruby the second weekend of November. I had to put my 5 gal water jugs in the river so they wouldn't freeze over night. Don't camp at rattlesnake no sunshine. Not many rafters out but a bunch of duck hunters. It was a solo trip and it really is amazing being on the river with no one talking. I heard and saw a lot of things I wouldn't have in a large group.
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