Colorado tailwaters offer the steadiest fall trout window

What's biting

What's next

Expect the same low, clear pattern to hold over the next few days, so lighter tippets and smaller flies should keep producing. Crystal Fly Shop (CO) notes that flies generally downsize as rivers drop, and that tiny, shiny nymphs such as RS2s and Flashback Pheasant Tails are picking up fish. Midge patterns suit this stage too. AvidMax Blog (CO) has featured midge emergers like the foam back as effective in clear water and cold conditions.

Plan around the middle of the day. Water temperatures bottom out near dawn and the cool 57°F readings leave room to fish comfortably through the afternoon. The waxing crescent moon sets early, so evenings will be dark and the best light is mid-morning to mid-afternoon. Streamers can also draw aggressive fish when skies turn overcast. Check state regulations and any voluntary closures before heading out, since Crystal Fly Shop (CO) has described temporary stretches closed by Colorado Parks and Wildlife in recent weeks.

Context

Mid October is typically the transition into fall patterns on Colorado rivers, with cooler water, shorter days and fish feeding more steadily. Brown Trout generally become more active and aggressive ahead of their fall spawn, so give spawning fish and redds plenty of room. This season has been unusual. Cutthroat Anglers (CO) and Colorado Trout Hunters both describe a drought year with very poor snowpack, which has left many freestone stretches low. Cooler weather is now easing the heat stress that dominated summer, which makes this stretch of autumn a welcome reset for anglers.