Green River tailwater cools into a fall brown trout window

What's biting

What's next

Flows near 2,300 to 2,460 cfs are on the high side for wading, so plan on fishing edges, seams and slower inside water rather than the main current. Expect fish to stack where faster water drops into softer pockets.

With a New Moon this week, the nights are dark and daytime light is the main driver. Plan the best windows around late morning into early afternoon, when the water is warmest and olive mayflies and midges are most likely to be active. Early and late hours can still produce for streamers aimed at Brown Trout moving toward spawning water.

If the cool trend continues, the 50°F readings upstream suggest the colder stretches will hold fish more actively, and the 56°F reading downstream will likely settle a few degrees lower. Check flow releases before you go, since a change in cfs will reshape where fish sit.

Context

Mid-October is typically the heart of the fall season on tailwater trout fisheries across the Intermountain West. Water temperatures in the low to mid 50s are generally ideal, and Brown Trout often become more aggressive and move shallower ahead of their spawning run. This is typically a time to leave spawning redds undisturbed and avoid wading through them. Flows are on schedule for the season, and the pattern looks like a normal autumn transition rather than an early or late one. Check state regs before harvesting.