Fall transforms Colorado fishing. Brown trout spawn in October and November, becoming territorial and aggressive. These normally cautious fish suddenly attack streamers and chase smaller fish from their redds. It's the time of year when trophy browns are most catchable.
The spawn brings browns from deep pools and undercut banks where they hide all summer. They move to gravelly shallows, becoming visible and accessible. Large fish that would never look at a fly in July will hammer a streamer in October. It's thrilling fishing.
Beyond the spawn, fall brings perfect fishing conditions. Crowds disappear after Labor Day. Rivers run at optimal levels - clear and cold. Blue-winged olive hatches bring fish to the surface on overcast days. Fewer anglers, active fish, and beautiful scenery make fall many anglers' favorite season.