Green River tailwater trout fishing holds steady into mid-October

What's biting

What's next

Expect little change over the next two to three days. With the New Moon in place, low-light mornings and evenings are the windows to plan around, and fish often feed more freely under dark skies and overcast. The cooler 50°F reading at gauge 09234500 points to the upper reaches holding the most comfortable water, while the warmer 57°F at gauge 09261000 should push fish to feed earlier in the day before afternoon warming.

Per MidCurrent, a beaded purple nymph is built for low-light, overcast days when high-contrast color does the work visibility can't. That is a sensible starting point at dawn and dusk. Flows near 2,300 to 2,600 cfs are strong, so focus on softer seams, inside bends and slower tailouts where trout can hold without burning energy. Wading will take care at these volumes.

If a cold snap arrives, trout may slide into deeper, slower runs, so slow your presentations and fish the bottom third of the water column.

Context

Mid-October is typically a transition period for freshwater in this part of Utah. Cooling nights pull water temperatures down from summer highs, and trout often feed more aggressively ahead of winter. Brown Trout in particular tend to become more active and territorial as fall progresses, so streamers and nymphs commonly earn attention this time of year. Check state regulations before harvesting, as seasonal rules can differ by water.