Lamar River

There is no place quite like the Lamar Valley in summer. The expansive meadows, the wolf packs hunting bison herds, the massive thunderheads building over the Beartooth Plateau — and threading through all of it, the Lamar River, one of the finest native cutthroat trout fisheries in the American West. The Lamar River drains the northeast corner of Yellowstone National Park, flowing southwest through its famous valley before joining the Yellowstone River just below Tower Junction, and it is the single best place in the lower 48 to catch a Yellowstone cutthroat trout on a dry fly.

Native Yellowstone cutthroat trout are the primary quarry here, and they are willing. Fish averaging 12 to 16 inches rise freely to attractor patterns, elk hair caddis, and parachute adams throughout the summer season. The Lamar's fish have never seen a stocked rainbow or a planted brown — these are genetically pure Yellowstone cutthroat, the same fish that have inhabited this drainage since before the park was established. That genetic purity makes every fish a prize worth photographing, even if the average size doesn't compete with a tailwater fishery.

Fishing the Lamar requires some patience with logistics. The river runs through a federal wilderness area, meaning no motorized vehicles, and most of the best water requires a mile or more of hiking to reach. The trailhead at the Lamar Valley pullout provides access to the lower meadow section, while the more remote upper reaches near Cache Creek and Soda Butte require serious day hikes. The effort is rewarded with nearly untouched water and fish that have rarely seen a fly.

Access is via the Northeast Entrance Road, which remains open year-round between Gardiner and Cooke City (unlike the rest of the park). Fishing opens June 15 in most of the Lamar drainage, which aligns well with post-runoff conditions. July and August are peak season — low, clear water, active fish, and the drama of the Lamar Valley at its most vibrant. September brings cooling temperatures, larger fish moving up from the Yellowstone, and the spectacular autumn colors of the cottonwood groves.

Regulations in Yellowstone are strict: a separate Yellowstone National Park fishing permit is required (in addition to a Wyoming or Montana fishing license), all native cutthroat must be released unharmed, and barbless hooks are required for all fishing in the park. No bait fishing is permitted anywhere within Yellowstone. The permit is available at any park entrance station or visitor center and is a modest fee that goes directly to fishery conservation.

Nearby Cooke City and Silver Gate offer limited services including the Cooke City General Store and a few outfitters who specialize in park fishing. The town of Gardiner on the north entrance provides more substantial options including full-service fly shops. Pack in everything you need — the Lamar Valley rewards self-sufficient anglers who come prepared for backcountry conditions.