Low, clear tailwaters carry the Colorado trout bite into October

What's biting

What's next

Expect the tight, technical pattern to hold. With a New Moon on the calendar, low-light mornings and evenings should be the better windows. Cooler fall air should keep trimming afternoon water temperatures, and the 65°F reading on gauge 09106485 sits close to the warm-water cutoffs that Pat Dorsey Fly Fishing and Cutthroat Anglers (CO) describe. Fish early, carry a thermometer, and rest the water when it climbs.

Crystal Fly Shop (CO) noted that as rivers drop, flies generally downsize, so plan on 6x and 7x fluorocarbon where fish see a lot of pressure. Where hatches overlap, fish can key in on one insect, so stealth in the approach matters as much as the fly. Streamers remain a reasonable choice on stained water after rain, per the same shop.

Context

October in Colorado normally brings cooling water and the start of fall streamer and baetis fishing. This year the drought has left many rivers low and clear, which is earlier and leaner than the usual pattern. Tailwaters below dams stay steadier than freestone stretches, and fish typically concentrate in deeper, cooler runs. Check current regulations and any voluntary closures before heading out.