5 Best Flies for Trout in New Mexico

The San Juan River is the reason the San Juan Worm exists - and it remains the essential fly on this river for good reason. The cold tailwater below Navajo Dam hosts abundant aquatic worm populations in its rich, silty runs, and the trout's diet reflects this: worms are consumed year-round in significant quantities. Red in #12 is the starting point for most San Juan anglers.

The San Juan Worm is not a gimmick or a last resort - it's a legitimate imitation of a real and important food source. On heavily pressured sections like Texas Hole, fish see enormous numbers of San Juan Worms and become selective to them. Size, drift quality, and depth control matter just as much with worms as with any other fly on this river.

The San Juan River is primarily a midge fishery. The cold, stable tailwater below Navajo Dam creates ideal conditions for chironomids, and they dominate the river's insect community in all life stages throughout the year. Zebra Midge and Mercury Midge in sizes #22–26 are the core patterns that every San Juan angler needs in abundance.

On calm mornings, midging San Juan fish rise to dry midge clusters in the slow, flat pools near the dam - a spectacular sight-fishing opportunity to large, visible trout feeding on the surface. A #24 midge dry or cluster pattern on 7X tippet is the setup for this fishing, which is among the most technical and rewarding in the state.

BWO hatches provide the best dry-fly fishing on the San Juan and Pecos rivers. On the San Juan, fall and spring emergences on overcast days bring large trout to the surface for extended periods - the finest dry-fly opportunity the river offers outside of the midge rises. A #20 Parachute BWO on 6X tippet is the standard approach.

On the Pecos River in the Sangre de Cristo Mountains, BWO hatches in October provide excellent fall dry-fly fishing in beautiful high-country scenery. The Pecos fish are less pressured than San Juan trout and rise more freely to well-presented BWO imitations.

The Pheasant Tail Nymph rounds out the core San Juan nymph rig alongside the worm and midge. As the third fly in a multi-nymph setup, a #18 PT Nymph covers the Baetis nymphing behavior that San Juan fish engage in during BWO cycles. It also performs well as a standalone nymph on the Cimarron, Red River, and Pecos where a broader range of mayfly species are present.

On New Mexico's mountain streams, the PT Nymph is the subsurface standard that complements dry-fly fishing and produces steadily between hatches. It's the reliable workhorse that keeps your line tight to fish when surface conditions aren't ideal.

While the San Juan is primarily a midge and worm fishery, New Mexico's mountain streams - the Cimarron, Red River, and Rio Grande tributaries - have good summer caddis hatches that call for the Elk Hair Caddis. On the Red River in the Sangre de Cristo Mountains, summer caddis from June through August provide reliable dry-fly action in a spectacular high-altitude canyon setting.

Rio Grande tributaries in northern New Mexico also have productive caddis hatches, and the Elk Hair Caddis is the fly that covers them across all of these freestone streams. A tan #14–16 is the most versatile color for New Mexico mountain stream conditions.