🐟 What fish can you catch in Mammoth?

Most commonly caught species around Mammoth , WY : Brown trout - 159 reported catches Rainbow trout - 138 reported catches Cutthroat trout - 93 reported catches Yellowstone cutthroat trout - 65 reported catches Brook trout - 42 reported catches .

📢 What are the latest Mammoth fishing reports?

The latest Mammoth , WY fishing reports are: @spencer.woolley reported a nice Brown trout . @colemcdermott reported a nice Rainbow trout at Hebgen Lake . @colemcdermott reported a nice Rainbow trout at Hebgen Lake . @benjaminfirth reported a nice Brown trout at Hebgen Lake . @marshall.tikusis reported a nice Brown trout at Hebgen Lake . .

Fishing in Mammoth, WY

Q: 🎣 Where to fish in Mammoth, Wyoming?

Anglers in Mammoth , WY recommend these top fishing spots: Yellowstone River , Gallatin River , Gardner River .

Q: 📅 What is the best time to go fishing in Mammoth?

Download the Fishbrain app and see today's Fishing and Weather Forecast for Mammoth , WY . We give you weather trends and help you find the perfect window to catch your next personal best. With Fishbrain Pro , you will get the following capabilities: Plan smarter: Get hour-by-hour fishing weather conditions. Fish at peak times: Use BiteTime™ predictions to maximize catches. Stay ahead of the weather: Get hyper-local, real-time updates. .

Wyoming, United States

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Top fish species in Mammoth

Brown trout

Rainbow trout

Cutthroat trout

Yellowstone cutthroat trout

Brook trout

Latest Mammoth fishing reports

Brown trout

21 in · 4 lb

Rainbow trout

Hebgen Lake

length · weight

Rainbow trout

Hebgen Lake

21 in · 4 lb

Brown trout

Hebgen Lake

length · weight

Brown trout

Hebgen Lake

length · weight

Rainbow trout

Hebgen Lake

22 in · 5 lb 2 oz

Brown trout

Gardner River

length · weight

Cutthroat trout

Gardner River

length · weight

Rainbow trout

Gardner River

length · weight

Rainbow trout

Hebgen Lake

length · weight

More catches in the app...

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Fishing regulations in Mammoth

Disclaimer: Always check local fishing regulations, water access rights and land ownership before fishing, regardless of any catches logged in that area by the Fishbrain community. Fishbrain has mapped millions of acres of government-owned land across the USA to help you identify potential fishing access, but you are responsible for ensuring compliance with all legal requirements.

Fishing regulations in Wyoming can change throughout the year. Make sure to check this page before fishing for the most up to date rules and regulations for the current season. Local regulations govern when you can fish, the max size of the fish you can keep, how many fish you can keep, and more.

Below you will see fishing regulations for catching Brown trout as of April 16th, 2026. To view regulations for a different fish species, please click on your preferred species in the drop-down.

Select species

Brown trout

Seasons

Open

Bag limit

Memorable

1 > 16

Measurement

Total Length

Aggregate

All lakes, unless indicated otherwise: bag limit six (6)

All streams, unless indicated otherwise: bag limit three (3) No more than

one (1) trout shall exceed sixteen (16) inches.

TOTAL STREAMS AND LAKES COMBINED: six (6)

Please see Wyoming fishing regulations for more information.

Excellent

Salmo trutta

Yellowstone National Park Fishing RegulationsA Yellowstone National Park fishing permit is required for fishing in Yellowstone National Park, but a state fishing license is not required. Find detailed information at https://www.nps.gov/yell/planyourvisit/fishing.htm or by calling 307-733-7381.

Regulations for

44°58′23.9″N 110°41′35.2″W

Regulations in the map

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FAQ about Mammoth fishing

Anglers in Mammoth, WY recommend these top fishing spots: Yellowstone River, Gallatin River, and Gardner River.

Most commonly caught species around Mammoth, WY:

Brown trout - 159 reported catches
Rainbow trout - 138 reported catches
Cutthroat trout - 93 reported catches
Yellowstone cutthroat trout - 65 reported catches
Brook trout - 42 reported catches

The latest Mammoth, WY fishing reports are:

@spencer.woolley reported a nice Brown trout.
@colemcdermott reported a nice Rainbow trout at Hebgen Lake.
@colemcdermott reported a nice Rainbow trout at Hebgen Lake.
@benjaminfirth reported a nice Brown trout at Hebgen Lake.
@marshall.tikusis reported a nice Brown trout at Hebgen Lake.

Download the and see today's Fishing and Weather Forecast for Mammoth, WY. We give you weather trends and help you find the perfect window to catch your next personal best. With Fishbrain Pro, you will get the following capabilities: