Madison River Hatch Chart & Bug Guide

Detailed Fly Pattern Recommendations

Midge Patterns (January through March)

Midges hatch year-round but dominate winter fishing. Trout key on larvae, pupae, and clusters of adults. Carry a variety.

• Zebra Midge (#18-22): Black body with silver wire, or red body with silver wire. The most versatile midge pattern. Fish under an indicator 12-18 inches deep.
• Mercury Midge (#18-22): Similar to Zebra but with a glass bead head. The flash triggers strikes on sunny days.
• Griffith's Gnat (#18-22): Peacock herl body with grizzly hackle palmered through. Imitates midge clusters on the surface. Dead drift in foam lines.
• CDC Midge Cluster (#18-20): Gray or black CDC wing over dubbed body. Floats well and suggests multiple midges trapped in film.
• RS2 (#20-24): Simple emerger with gray dubbing and split tail. Deadly on educated fish. Fish just below the surface.

Salmonfly & Golden Stone Patterns (June through July)

The main event. Salmonflies (#4-6) come first in orange/black, followed by golden stones (#8-10) in yellow/gold. Big flies, big fish, big takes. Visit our salmonfly season guide for timing details.

• Chubby Chernobyl (#6-8): Orange/black foam body with rubber legs. High visibility, durable, and floats well. The workhorse pattern.
• Norm's River Hi-Vis (#6): Orange body with bright indicator post. Easy to track in choppy water. Proven fish catcher.
• Henry's Fork Foam Stone (#4-6): Realistic silhouette, orange/brown foam. Works when fish get selective to shape.
• Pat's Rubberlegs Salmon (#6): Black/coffee rubber legs with orange chenille. Nymph version for fish that won't rise.
• Kaufmann's Stimulator (#8-10): Yellow body with ginger hackle. My golden stone go-to pattern.

Terrestrial Patterns (Mid-July through September)

When hatches fade, terrestrials take over. Hoppers, ants, and beetles blow into the river on windy afternoons. Fish tight to banks and give the fly a twitch.

• Morrish Hopper (#8-10): Foam body with rubber legs. Colors: tan, yellow, peach, pink. High-viz top makes tracking easy.
• Dave's Hopper (#8-10): Classic deer hair pattern. Tan or yellow. More realistic silhouette than foam patterns.
• Foam Ant (#14-16): Black or cinnamon foam body with legs. Fish in calm water near banks and vegetation.
• Beetle Bug (#12-14): Black foam shell back with peacock body. Cast under overhanging trees.

Streamer & Sculpin Patterns (Year-Round)

When nothing hatches or you want to target bigger fish, strip streamers. Fall brown trout fishing relies heavily on these patterns.

• Woolly Bugger (#6-10): Olive, black, or brown. The universal streamer. Weight varies by water depth.
• Sparkle Minnow (#6): Flash body with marabou tail. Olive or white. Effective on pre-spawn browns.
• Sculpzilla (#2-6): Realistic sculpin profile with weighted head. Olive/brown. Fish along bottom with short strips.
• Slumpbuster (#4-6): Pine squirrel body creates natural movement. Olive or natural. Stripped or swung.

Reading the River to Pick Flies

The hatch chart gives you a starting point, but conditions on the water dictate final fly selection. Here's what to watch for:

• Water clarity: If runoff browns things out to less than 18 inches visibility, swap to a black/coffee Rubberlegs and a #14 San Juan Worm. Bright colors (pink, orange, chartreuse) help fish find the fly in murky water.
• Water temperature: Salmonflies need 52°F to pop; carry a stream thermometer. Cold water (under 45°F) means slow retrieves and deep presentations. Warm water (over 65°F) brings fish to the surface for terrestrials.
• Fish behavior: Splashy rises suggest caddis or terrestrials. Subtle sips indicate mayflies or midges. Subsurface flashes mean nymphing. Watch before you cast.

How This Compares to Montana Hatch Charts Generally

Most Montana fly fishing hatches follow the same broad calendar: midges through winter, Skwalas and Baetis in spring, salmonflies and golden stones at the front of summer, PMDs and caddis through the warm months, terrestrials in late summer, then Baetis again in the fall. A general Montana hatch chart will get you in the right month. It will not get you on the right water.

The Madison diverges from a statewide chart in three ways worth knowing:

• The salmonfly hatch marches upstream. On most Montana rivers you chase a hatch by date. Here you chase it by river mile. It starts low and works up toward Lyons Bridge over roughly two weeks. See the salmonfly guide.
• Three reaches run on different clocks. The Lower Madison draws warm water off Ennis Lake and hatches earlier; the Upper stays colder and later; the reach inside Yellowstone Park is geothermally warmed by the Firehole and has its own season entirely. A single statewide chart cannot express that.
• Hoot owl closures interrupt the calendar. Mid-July through August the Lower Madison regularly hits the 73°F threshold that triggers afternoon closures, so the terrestrial window on paper is shorter in practice.

The neighboring rivers, the Gallatin, Jefferson, Yellowstone and Big Hole, share most of these bugs on a similar timeline, so this chart travels reasonably well within southwest Montana. Match it against current water temperature and flow rather than the date alone, and it will hold up.