Fishing Season: Year Round (Prime: April 1 - November 31)

Bighorn River - MT

Fishing Outlook & Conditions

Water Temp:

52

Forrester's Big Horn River Resort's Tip of the Week

Position yourself in the flat water below the riffles by 6:30 PM for the PMD spinner fall — this is the best dry fly fishing of the season right now. Drop down to 5X or 6X tippet and add an extra 12 inches to your leader to eliminate micro-drag. In the morning, start deep with a sowbug or zebra midge under an indicator, then transition to PMD nymphs high in the column as the afternoon hatch builds. Once you find a pod of feeding fish in a lane, stay put — the fish are grouped and consistent right now.

Directions open in app

Map of Bighorn River

Water Flow Data

Orvis-Endorsed guides nearby

Bighorn River Resort

5-Day Outlook as of 6/30/26

ONE-WEEK FORECAST Monday June 29: 65°F, cloudy, 10% chance of rain. Tuesday June 30: 76°F, 15% chance of rain. Wednesday July 1: 80°F, 30% chance of rain. Thursday July 2: 79°F, 25% chance of rain. Friday July 3: 82°F, 25% chance of rain. Overall mild and warming through the week with occasional afternoon showers possible — classic summer conditions on the Bighorn. Afternoon clouds will help trigger PMD hatches throughout the week.

Techniques & Tips as of 6/30/26

Nymphing remains the most consistent technique throughout the day. Run a two-fly rig with a sowbug or scud on top and a smaller PMD nymph or zebra midge as a dropper, set 4 to 5 feet under an indicator, keeping everything deep and drifting clean. If you are not occasionally ticking the bottom add weight before changing flies. For dry fly fishing, the afternoon PMD hatch is building daily between 11am and 2pm — transition to dries as fish begin rising in the riffles. The evening spinner fall from 6:30 to 8:30 PM is the highlight of the day right now — position yourself in the flat water below the riffles and watch for fish sipping in the film as the light drops. Streamer fishing along the banks at first light and last light is producing fish. Slow strip a sculpin or woolly bugger along undercut banks and structure.

Local Species Available Year Round (Prime: April 1 - November 31)

  • Fish Icon

    Wild Rainbow & Brown Trout

Forrester's Big Horn River Resort's Recommended Fly Patterns

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

Name: Colors: Size(s):
TH Zebra Midge Black 18-20
Bead Head Brassie™ N/A 18-24
Blue Winged Olive N/A 16-18
RS2 18-20
All Day Wood Multi 14
baetis black 16-22
Tungsten Jig Bugger White & Black 12-18
Midge Black 16-20
Ray Charles Grey 14-16
Pinky Pink 16-18

TH Zebra Midge

A handy midge fly pattern for stillwater.

2.49

Item #1X94

Buy Now

Forrester's Big Horn River Resort's Recommended Gear

Description: About Bighorn River

The most easterly of Montana's fine rivers, the Blue Ribbon waters of the Bighorn, is also the finest in terms of numbers of fish. With nearly 2,500 fish per mile at an average of 19+ inches, catching 20 to 24" browns and rainbows every day, it is no surprise the river is known for its fantastic fishing and cold water. The section of the Bighorn in south eastern Montana is actually the last section of the river. Beginning when it flows out of the Wind River drainage out of Wyoming. The Bighorn's course is as unique as its fishing. After flowing through much of Wyoming the river flows into Bighorn Lake which is created by Yellowtail Dam. Yellowtail is a 525 foot concrete dam, that fills a remarkable 71 mile “breath taking” canyon and offers recreation for boating enthusiasts. But it isn't until the river releases from the bottom of the dam that the fishing becomes world-class. This clear and cold release creates nearly 30 miles of prime wild trout habitat. With an average of 50 degrees the aquatic bug life is truly a biologists dream. Also to mention the installation of the Afterbay Dam 1 mile below Yellowtail Dam, takes the fluctuation out of this hydroelectric dam, which is prominent in tail water fisheries. The result is constant flows year round. As mentioned the Bighorn is arguably one of the finest streams in the state, and in the world. The high fish count per-mile is one thing, but the potential for a lifetime trophy brown or rainbow trout is very good on this river. Browns average around 16 inches and rainbows average just a touch larger. Hatches are prolific the entire year and because the Bighorn is in the southeastern corner of the state and at a lower elevation than many Montana streams it can, and does fish well, the entire year. During the different hatches it is not unusual to have 10-20 fish with in easily casting distances. The flies of choice are on the small size 16-20’s with tippets ranging from 3x-6x fished with 8 ½ - 9 foot 4-6 weight rods. With Montana's stream access law, the Bighorn remains a float-fishers rivers. Using a drift boat, or other floating craft is the most effective way to fish the Bighorn. Bank or wading anglers are limited by a few state owned accesses and gaining permission from landowners is difficult, mainly because it flows through the Crow Indian Reservation. The Bighorn is the ideal river for anyone wishing to head to one destination and intimately fish one river. However, it is important to note that the Bighorn is still a natural fishery. Even though there are over several thousand fish per mile doesn't mean that fish are pushovers, quite the contrary as the Bighorn is still a technical river that requires some local knowledge and patience to fish successfully. Fortunately, as isolated as the Bighorn may seem, there are a few quality lodging options located near the premier top 3 mile section of the river. The river averages 150-250 feet in width with flows average in the 2000-3000 Cubic Feet Per Second (CFS) range. Prime flows for the Bighorn range from 2,000 to 5,000 CFS. With broad riffles followed by deep pools. The landscape is equally impressive with rolling plains, sparsely places cottonwoods and willows are the backdrop for this section. Gravel and grass islands, with the oh-so inviting side-channels are found throughout the river. These islands create unique riffle corners, side channels and drop offs that always yield some great fish and great memories. The sections to float are Afterbay to Three Mile access, which is the most popular and premier section of the river. The second section is Three Mile to Bighorn, which is about a ten mile float, which offers great fishing in a more secluded setting. The last section, Bighorn to Mallards, is the start of the motorized craft area. That does somewhat retract from the solitude of the fly fishing experience. The fish numbers are smaller due to the water quality by tributary run off as well as irrigation returned ditches on this lower section of the river. The most popular float is Afterbay to Bighorn access. Billings Montana is a the nearest major city which is a 90 minute drive and nearest major airport with commercial service. There is a small airstrip in Ft. Smith that can accommodate private planes. The Bighorn truly is one of the great fisheries in the world. If offers a fly fisherperson the experience of a life time. This river always lives up to the legendary status that it has become.

Nearest Airport:

Billings Logan International Airport (BIL)

Hatches:

Pale Morning Dun (PMD) Black Caddis Yellow Sally Midge Blue Winged Olive (BWO)

Best Time to Fish:

Morning through Evening — peak action 11am-2pm PMD hatch and 6:30-8:30pm spinner fall Best stretch:

Best Stretch:

Afterbay to 3 Mile 3 Mile to Bighorn

Best Access:

3 Mile 3 Mile 13 Mile