Most catfish anglers know that fall can be the right time for trophy channel cats, especially if there is moderate flow and cooperative temperatures. With a little flow, channel catfish will make a last push to gorge in preparation for winter. This is an upstream migration that occurs when the water temperatures begin to dip from 70 down to the mid-50s. In a perfect fall, this is a slow drop that takes 15-30 or more days to complete.