Top 9 Mother's Day Caddis Flies and How to Fish the Hatch

Updated November 5th, 2026

At a Glance

• Best pupa: LaFontaine’s Sparkle Pupa, Silvey’s Caddis Pupa, or Hare's Ear Dirty Bird
• Best emerger: Silvey’s Edible Emerger, Lawson’s Caddis Emerger or Iris Caddis, in the film
• Best dries: Corn-Fed Caddis, X-Caddis and Peacock Elk Hair Caddis
• Hook size: 14–16 (size up to a 12 or 14 to track your dry in a heavy hatch)
• When: mid-April through May, afternoons, until runoff starts
• Where: Montana’s Madison, Yellowstone, Missouri and Big Hole rivers and Idaho’s Henry’s Fork

At its peak, the Mother’s Day caddis hatch is one you have to see to believe: a blizzard of millions of fluttering caddis covering every surface, crawling up your sleeves, into your ears and down your waders, while trout gorge on one of the biggest bug masses of the year. It’s a jaw-dropping spectacle, though it’s best to keep your mouth closed. If you’re squeamish about a few (hundred) bugs crawling on you, this one may not be for you.

What is the Mother's Day caddis?

The Mother's Day caddis, also called the grannom (Brachycentrus occidentalis), is a size 14–16 caddisfly with a green to dark olive body and mottled brownish-gray wings. It hatches throughout Montana and the surrounding Rockies, with famous hatches on the Madison, Yellowstone, Missouri and Big Hole, and on Idaho's Henry's Fork.

The larvae build small cases from plant pieces, square in cross-section, and fasten them to rocks in the current. In spring they seal the case and pupate inside it, then cut free and swim to the surface wrapped in a shiny layer of gas, which is exactly what a sparkle pupa imitates.

The Mother's Day caddis life cycle

Step through each stage below to see where it lives in the river, how long it lasts and when trout eat it.

When does the Mother's Day caddis hatch happen?

The hatch can start as early as mid-April and usually runs through May, though a long winter pushes it back. It butts right up against the start of runoff, so it's at the mercy of flows: early hot days can turn rivers to chocolate milk and shut the hatch down, and a sudden bout of snow can delay or ruin it. Consistent weather and a little luck are what it takes to see one of the famous blizzard hatches, which typically last until runoff really kicks in.

Adults usually hatch from mid to late afternoon until dark, as the water warms from the 40s into the low 50s°F. Fishing below the surface stays strong the whole time. Even when you don't see adults, trout are eating larvae, pupae and emergers, so carry flies for every stage.

How do you fish the Mother's Day caddis hatch?

Start deep. If you aren't seeing rising fish or adult caddis, especially in the morning, start with a two-fly nymph rig with a caddis pupa. As bugs begin to hatch, hang a pupa or emerger dropper beneath one of the dries below.

Size up and use a sighter. At the peak of the hatch, it can be downright impossible to track your dry fly. Go up to a size 12 or 14 so your fly stands out from the naturals, and carry a few flies with hi-vis posts or overwings, especially for low light.

Pick one fish. It's common to struggle for a take purely because of the sheer volume of bugs on the water. Instead of casting into a pod, pick a fish near the back and watch it: what it's eating and how often it rises. Time your cast to its rhythm and put your dry about two feet ahead of it. Working one fish methodically beats searching for a willing one.

Fish the egg-layers. As evening sets in, females return to dap their eggs on the surface. If dead drifts and subtle twitches don't get an eat, try imitating that dapping movement.

Swing a soft hackle. If dries simply aren't working, a swung soft hackle is often deadly for picky fish, and it's worth trying throughout the day.

The Best Mother's Day Caddis Nymphs & Emergers

1. LaFontaine's Sparkle Pupa

There may never have been an angler who understood caddis better than Gary LaFontaine, and his sparkle pupa is a must-have for caddis everywhere. When the pupa cuts out of its case, it swims to the surface wrapped in a bubble of gas, and the Antron yarn of the sparkle pupa imitates that sheen. Fish the beadhead on the bottom in the morning and midday, or an unweighted version just below the surface during the hatch.

Best for: fishing the rising pupa at any depth, from the riverbed to just under the film. Shop the Bead Head Sparkle Pupa.

2. Silvey's Caddis Pupa

A modern take on the sparkle pupa, Silvey's Caddis Pupa uses a strip of pearl braid to imitate the gas bubble around the pupa's abdomen, a key trigger for feeding fish. Starling emerging wings and wood duck antennae finish a realistic profile. Fish it in olive to match the Mother's Day caddis.

Best for: nymphing the pupa stage before and during the hatch. Shop Silvey's Bead Head Pupa.

3. Hare's Ear Dirty Bird

This buggy, do-everything nymph borrows from a few staples: the pheasant tail, the hare's ear and the partridge soft hackle. It also passes for a mayfly or small stonefly nymph. On the swing, it rises through the water like an emerging pupa, and the partridge hackle and strands of Krystal Flash will catch their eye.

Best for: dead-drifting along the bottom, then letting it swing up at the end of the drift. Shop the Hare's Ear Dirty Bird.

4. Silvey's Edible Emerger

The body is a hank of Antron, burned at the back end for a realistic profile. A few strands of marabou imitate legs and add movement, starling imitates the emerging wing, and a lightly dressed deer hair head keeps it afloat with the body hanging just under the surface, like a caddis in the final stage of emergence.

Best for: trout keyed in on emergers just under the film. For in-stock alternatives, try Lawson's Caddis Emerger or the Iris Caddis.

The Best Mother's Day Caddis Dry Flies

5. Corn-Fed Caddis

Tied mostly from CDC, this high-floating, buggy dry has a full wing profile, and CDC spun in a dubbing loop makes lifelike legs with plenty of movement. A darker version best matches the Mother's Day caddis's dark olive body, and a small sighter post of poly yarn makes it easier to track.

Best for: keeping track of your dry fly in a heavy hatch. Shop the Corn-Fed Caddis.

6. Missing Link Caddis

Mike Mercer designed the Missing Link for caddis hatches, and in smaller sizes it also passes for mayflies and midges. The body is sparse with a lightly dubbed thorax, and splayed Z-Lon wings imitate a spent caddis or one fluttering to get off the water. A deer hair wing with hackle wrapped around the post keeps it flush in the film but easy to track.

Best for: when you're not sure whether trout are eating emergers, adults or spent caddis. Shop the Missing Link Caddis.

7. Peacock Elk Hair Caddis

A standard elk hair caddis can get the job done, but we recommend the peacock version, whose peacock herl body matches the dark body of the Mother's Day caddis. The only downside is tracking it among hundreds of naturals, so if you tie your own, add a poly yarn hot spot as a sighter. Don't be afraid to give it some movement.

Best for: skating and twitching to imitate fluttering adults and egg-laying females. Shop the Peacock Elk Hair Caddis.

8. Parachute Caddis

A deer hair wing rides close to the body, and a bright poly yarn post and parachute hackle make it ride high and stand out among the naturals. Olive is the color to carry for this hatch. Treat the post with floatant and it will stay dry all day.

Best for: heavy riffles and fishing from a drift boat. Shop the Parachute Caddis.

9. X-Caddis

Developed by Craig Mathews and John Juracek of West Yellowstone around 1980, the X-Caddis has a trailing Z-Lon shuck that imitates a caddis struggling to emerge. It comes in plenty of modern variations, and we're particularly fond of the pheasant tail version in olive for the Mother's Day hatch.

Best for: picky fish eating caddis stuck in their shucks. Shop the X-Caddis or the Mathews PT X Caddis.

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Frequently Asked Questions

When is the Mother's Day caddis hatch? The hatch usually runs from mid-April through May on certain Rocky Mountain rivers such as the Yellowstone and Madison, starting as the water warms from the 40s into the low 50s°F. It typically ends when spring runoff muddies the rivers, but can bounce back depending on the size and duration of high flows.

What size are Mother's Day caddis? Mother's Day caddis are usually size 14 to 16. During a heavy hatch, many anglers fish a size 12 or 14 dry so they can pick their fly out among the naturals.

What color are Mother's Day caddis? Adults have green to dark olive bodies and mottled brownish-gray wings. Pupae have green bodies with dark wing pads, so olive and peacock flies match them well.

What time of day do Mother's Day caddis hatch? Adults hatch from mid to late afternoon until dark, and egg-laying females return to the water in the evening. Fish pupae and nymphs in the morning before the hatch starts.

What is the best fly for the Mother's Day caddis hatch? There isn't one best fly, because trout eat every stage. Carry a sparkle pupa or Silvey's Pupa for fishing deep, an emerger for the film, and dries such as the Corn-Fed Caddis, X-Caddis and Peacock Elk Hair Caddis.

Why won't trout eat my dry fly during the Mother's Day caddis hatch? With millions of naturals on the water, your fly is easy to lose and easy for trout to ignore. Pick one fish, time your cast to its rise, and try an emerger or a swung soft hackle if it keeps refusing your dry.

Where can you fish the Mother's Day caddis hatch? The best-known hatches are in Montana and Idaho, on the Madison, Yellowstone, Missouri and Big Hole rivers and the Henry's Fork.

How do you fish the Mother's Day caddis egg-laying flight? In the evening, females dap their abdomens on the surface to release their eggs. Fish a dry or a spent caddis with small twitches to imitate that movement, and keep fishing until dark if bugs are still on the water.

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