Montana, Wyoming, Idaho
Guided Fly Fishing Trips
Fly Fishing the Big Horn River
The Big Horn River is the heart of what we do.
This is some of the most consistent trout fishing in Montana, with strong hatches, healthy fish, and a season that offers great opportunities from spring through late summer.
Most trips are based out of Fort Smith, with easy access to the river and comfortable lodging nearby.
Fishing Options
Standalone fishing trip
Perfect for anglers who want a few full days on the Big Horn. RSO offers guided fly fishing trips in Fort Smith, MT, and Thermopolis, WY.
Add-on to select hunts
Fishing pairs especially well with RSO’s bird combo hunts and prairie dog trips.
Want to Add Fishing to Your Hunt?
Select hunts can include guided Big Horn River fishing days.
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Fishing add-on: $850 per day
Includes lodging and guided fishing rate.
Call Ryan if you want to build the right combination trip.
Spring and Summer Availability
Fly fishing is available throughout the spring and summer months, and dates fill quickly during peak season.
Whether you’re coming out for a dedicated fishing week or adding a day or two onto a hunt, we recommend booking early.
Rainbow & Brown Trout
Fort Smith, MT
Home to one of the most productive tailwaters in the West, Fort Smith offers year-round fly fishing on the legendary Bighorn River. Known for its strong hatches, crystal-clear flows, and healthy brown and rainbow trout populations, this stretch is perfect for anglers of all skill levels looking for consistency and big fish potential.
View More Details & Book Trip
Guided Fly Fishing
Thermopolis, WY
Thermopolis offers incredible spring and fall fly fishing on the upper stretches of the Big Horn River. With fewer crowds, warmer water from the nearby hot springs, and active fish, this section shines in the shoulder seasons. It's a great choice for anglers looking to extend their season with strong hatches and productive float trips.
View More Details & Book TripSteelhead Fishing
Kooskia, ID
For anglers chasing the thrill of winter chrome, Kooskia delivers. In partnership with Anglers Edge Adventures, our January–February steelhead trips offer the chance to land powerful wild fish in remote, scenic stretches of the Clearwater River system. These trips are raw, rewarding, and tailored for the serious steelhead angler.
Multi-Day Trips
Custom Fly Fishing Trips
Looking to go beyond the standard day float? Our multi-boat, multi-day trips are built for anglers who want to dig deeper—fishing multiple rivers across the region, exploring different fisheries, and experiencing the variety that Montana and Wyoming have to offer.
Perfect for groups of friends, families, or returning clients, these extended trips allow you to cover new water each day and tailor each float to your group’s goals and experience level. Whether you’re chasing wild browns on the Bighorn or exploring lesser-known river stretches, we handle the logistics so you can focus on the fishing.