Thermopolis, WY

What To Expect

Thermopolis is a hidden gem for spring and fall fly fishing on the upper Bighorn River. Thanks to nearby hot springs, the river stays warmer through the colder months—making it a go-to spot when other rivers slow down.

Below the Wedding of the Waters, the river sees less pressure than better-known stretches, offering solitude and strong fishing. Trout here are healthy and aggressive, taking nymphs, streamers, and dries depending on the season.

Float trips in Thermopolis are a great way to extend your fishing season. Red rock cliffs and cottonwood-lined banks make this place feel as good as it fishes.

What To Bring

Fishing in Thermopolis shines during the shoulder seasons—spring and fall—when the river stays warmer thanks to the nearby hot springs, but the air can be unpredictable. One hour you’re in a t-shirt, the next you’re layering up.

Recommended Gear:

  • Waders and sturdy boots (we often float, but hop out to wade key runs)

  • Breathable, moisture-wicking base layers

  • Waterproof rain jacket or shell

  • Hat and sun protection, even in cooler months

  • Polarized sunglasses for glare reduction and sight fishing

  • A warm beanie or gloves if you’re fishing early or late in the season

Dry bags are helpful for stashing layers and personal items. We’ll have extra storage space in the boat, too.

RSO provides all fishing gear if needed, but you’re welcome to bring your rod (5–6 wt), reels, and flies. We’ll chat before your trip to help you dial it in.

Where to Stay

  • Best Western Plus Plaza Hotel – Clean and convenient with mountain views
  • Days Inn by Wyndham Thermopolis – Features hot springs pool access
  • Hot Springs Hotel & Spa – Riverfront resort
  • Image of a man holding a rainbow trout on the Bighorn River outside Thermopolis, WY showcasing the guided fly fishing trips provided by Ryan Stefek Outfitters, RSO.
  • Image of a woman holding a rainbow trout on the Bighorn River in Fort Smith, MT showcasing the guided fly fishing trips provided by Ryan Stefek Outfitters, RSO.
  • Image of Ryan Stefek of Ryan Stefek Outfitters holding a rainbow trout on the Bighorn River in Thermopolis, WY
  • Image of a man holding a rainbow trout on the Bighorn River in Thermopolis, WY showcasing the guided fly fishing trips provided by Ryan Stefek Outfitters, RSO.
  • Image of a man holding a brown trout on the Bighorn River in Thermopolis, WY showcasing the guided fly fishing trips provided by Ryan Stefek Outfitters, RSO.
  • Image of a man holding a brown trout on the Bighorn River in Thermopolis, WY showcasing the guided fly fishing trips provided by Ryan Stefek Outfitters, RSO.
  • Image of a group of fly fishing clients who booked a multiple boat trip with Ryan Stefek Outfitting in Thermopolis, WY
  • Image of a man holding a brown trout on the Bighorn River in Thermopolis, WY showcasing the guided fly fishing trips provided by Ryan Stefek Outfitters, RSO.
Estimated total cost
$650
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