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Warm water temperatures and low river flows prompt fishing closures on select rivers after 2 p.m. in Yellowstone
News Release Warm water temperatures and low river flows prompt fishing closures on select rivers after 2 p.m. in Yellowstone Fly fishing near Biscuit Basin NPS / Jacob W. Frank Subscribe | What is RSS News Release Date: July 9, 2026 Contact: Yellowstone Public Affairs , (307) 344-2015 MAMMOTH HOT SPRINGS, Wyo. – Effective Thursday, July 9, 2026, select Yellowstone National Park rivers and streams will close to fishing daily from 2 p.m. to sunrise the following day due to warm water temperatures and low river flows. Water temperatures in select rivers and streams have exceeded 68 degrees Fahrenheit (20 degrees Celsius) in recent days, and flows are low. Additionally, air temperatures with highs around 90 degrees Fahrenheit (32 degrees Celsius) are forecast in the coming days. These conditions are lethal to trout, and the closure will protect the park’s native and wild trout fisheries and will remain in effect until cond...