US Western Rivers Face Heat-Driven Fishing Closures

Record heat this summer has pushed water temperatures in the U.S. West to lethal levels for trout, prompting wildlife officials to impose hour‑based fishing bans on rivers and streams. In Montana, the Fish, Wildlife & Parks department expanded afternoon closures to cover more than 1,200 miles of waterways, while Colorado restricted fishing on 19 rivers. Yellowstone National Park also extended its afternoon restrictions across the park.

Anglers such as Mike Wever, who fished the Yellowstone River in shorts, said the limits are necessary to protect the resource. Biologist Adam Strainer noted that such closures have become routine during the June‑September season as climate‑driven drought and heat intensify. The same heat‑related restrictions affect popular hopper‑season rivers like the Madison, Big Hole and Bitterroot, where early‑morning fishing remains the best legal window.

The measures aim to reduce stress on prized trout species, including rainbow and cutthroat, whose survival is threatened by warm, low‑flow water conditions.