Fishing Season: Spring/summer through fall

Cimarron River - CO

Fishing Outlook & Conditions

RIGS Fly Shops & Guide Service's Tip of the Week

The Cimarron high country is open again, and fishing has resumed across the Silver Jack Reservoir area. Road access to Silver Jack is now open from both directions, giving anglers access back into the forks, the reservoir area, and the Big Cimarron below the lake. The three forks were not hit hard by the fire, and we have been seeing healthy fish numbers both above and below the reservoir. Fishing has been good, with fish beginning to shift into more fall-style feeding patterns. Most of the activity has been subsurface, but fish are still willing to rise when a hatch is coming off or when a well-presented dry moves through the right water. Light dry-dropper rigs have been the most productive approach and allow anglers to cover runs, pocket water, and pools effectively. Lead with a smaller caddis, mayfly, or attractor dry, then trail a caddis pupa, small mayfly nymph, or general attractor nymph underneath. Focus on defined seams, softer edges, and the deeper portions of pools where fish can feed efficiently as conditions continue to cool. Below the reservoir, the Big Cimarron is also fishing well, but this section can still be tricky to move through. Be prepared for wading, rock hopping, and working carefully through pocket water and uneven banks. Overall, it is great to have this area open again, and the high country should continue to fish well as we move deeper into fall.

Directions open in app

Map of Cimarron River

Water Flow Data

Orvis-Endorsed guides nearby

RIGS Fly Shops & Guide Service

5-Day Outlook as of 9/21/26

Finally back Open. Fall season is here so size everything down and keep an eye on the weather.

Techniques & Tips as of 9/21/26

Light dry dropper with a caddis or mayfly adult and trailing a mayfly or caddis nymph behind.

Current Conditions as of 9/21/26

Area is has been getting affected a little with rain but waters have remained fishable. Lower flow that are average for this time of year.

Local Species Available Spring/summer through fall

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    Cutthroat

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    Brook Trout

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    Rainbow Trout

RIGS Fly Shops & Guide Service's Recommended Fly Patterns

"Must-have" fly fishing patterns in descending order of importance:

Name: Colors: Size(s):
Adams N/A
21st Century Adams N/A
Tactical Peeping Caddis TH Jig N/A
Flash Beetle N/A
Elk Wing Caddis N/A
Tactical OE Rhyacophila Larva N/A

Adams

Popular on rivers around the world, the Adams dry fly is a versatile pattern trout love to strike.

RIGS Fly Shops & Guide Service's Recommended Gear

Description: About Cimarron River

High Alpine fishing at its best! The Cimarron River offers endless fishing for Rainbow Trout, Cutthroat, and Brook Trout. As one of the most beautiful settings in Colorado, the Cimarron high country offers rare opportunities for solitude, native fish, and remote access. If you’re looking for a real Colorado backcountry experience, it doesn’t get any better than this. The Forks of the Cimarron include the West Fork, Middle Fork, and East Fork, and each offer an exceptional high-country angling experience. These small freestone streams provide miles of access, with riffles and pools, and plenty of trout. In addition to the Forks, the Big Cimarron includes a three-mile tailwater stretch below Silver Jack Reservoir. Large boulders and deep pools provide excellent habitats for large high-country trout. Summer through fall is the best time to fish the high country. After the snow melts and the Forks settle down, anglers can enjoy fishing dry flies at 9,600 feet with beautiful mountain scenery as the backdrop. After the summer mayfly fade, it’s all about hoppers. Throwing dry flies and hopper patterns at native and wild trout is tough to beat!

Nearest Airport:

Montrose Regional Airport

Bait Recommendations:

Foam Dry flies (Hoppers, chubbys, ants) as well as stimulators and caddis dry flies. Bead head nymphs (pheasant tails, copper johns, smaller perdigons).