Yellowstone fishing cut short every day: no angling after 2 p.m. until sunrise

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• What the rule means for anglers
• Why timing and temperature matter
• Guidance for anglers

Beginning July 29, Yellowstone National Park will ban fishing on its rivers and streams every afternoon and overnight to protect struggling trout populations as summer heat drives water temperatures up and flows down. The new daily shutdown — from mid-afternoon until sunrise — is intended to reduce stress on fish during the hottest, lowest-flow period of the day.

Park officials said the restrictions are a response to sustained high water temperatures and below-average stream flows that have raised the risk of mortality for native and wild trout. The move supplements full river closures already in place on several waterways earlier this month.

What the rule means for anglers

The closures will run daily from 2 p.m. to sunrise and will remain until conditions improve. Most rivers and streams in the park are open to fishing from sunrise to 2 p.m. only. Separate, full-day closures that began July 15 remain in effect on the Madison, Firehole and Gibbon rivers (the Gibbon closure applies downstream of Norris Campground).

• Start date: July 29
• Daily closed hours: 2 p.m. to sunrise
• Affected waters: All rivers and streams in Yellowstone (subject to the earlier full closures noted above)
• Lakes: Yellowstone Lake and other park lakes remain open from sunrise to sunset under the 2026 fishing regulations
• Why now: Water temperatures recently exceeded 68°F (20°C) and flows are below long-term averages

Why timing and temperature matter

Warm water holds less oxygen and, combined with low flows, creates conditions that can be lethal for trout. Park scientists warn that temperatures above 68°F are especially stressful. Forecasts calling for continued hot and dry weather — with only isolated afternoon storms possible — increase the chance that streams will stay warm and shallow.

Staff will keep monitoring river conditions and may lift the afternoon closures or impose additional restrictions depending on the data. Officials say their priority is preventing large-scale fish kills and protecting Yellowstone’s native fisheries for the season ahead.

Guidance for anglers

Park rangers urged anglers to minimize harm when fishing during the allowed hours. Recommended practices include landing fish quickly, avoiding lengthy fights, and handling fish gently while keeping them submerged as much as possible so they can recover before release.

“Fish during the coolest times of day and do not exhaust hooked trout,” park staff advised, noting that careful catch-and-release behavior could reduce the need for stricter, round‑the‑clock closures if conditions worsen.

Yellowstone officials said updates will be posted as assessments continue on the National Park Service website. The park’s response underscores growing summer stress on western rivers as heat and drought intensify across the region.