Few flies have caused as much controversy — and caught as many fish — as the squirmy worm. Love them or hate them, tungsten bead squirmy worms are devastatingly effective for trout, and the addition of a tungsten bead takes an already deadly pattern to a whole new level. Here's everything you need to know about fishing them effectively. Browse the full Squirmies collection for every color and size.
Why Tungsten Bead Squirmy Worms?
The original squirmy worm is tied with a soft, stretchy silicone body that undulates naturally in the current — mimicking an aquatic worm or annelid that trout absolutely cannot resist. Adding a tungsten bead serves two purposes: it gets the fly down to the fish quickly, and it adds a subtle flash that triggers strikes even in off-color water.
Unlike traditional squirmy worms tied on standard hooks, tungsten bead versions sink faster and stay in the strike zone longer, making them especially effective in deeper runs and faster water.
Best Colors and When to Use Them
Color selection matters more than most anglers realize. Here's a breakdown of the top producers:
Red and Blood Red
Red is the classic squirmy worm color and for good reason — it imitates a bloodworm, one of the most common aquatic invertebrates in trout streams. Fish red and blood red squirmies year-round, but they're especially effective in early spring when water temperatures are still cold and trout are feeding heavily on midges and worms.
Fluorescent Pink and Hot Pink
Pink squirmy worms are a go-to color in off-color or slightly turbid water. The bright color is highly visible to trout even when visibility is reduced, and it triggers aggressive reaction strikes. Don't overlook pink in clear water either — trout sometimes key on it even when conditions are perfect.
Fluorescent Orange
Orange squirmies shine during runoff season and in rivers with high sediment loads. The color cuts through murky water and imitates salmon eggs that have washed downstream — a high-calorie food source that trout actively seek out.
Earthworm (Brown/Tan)
After a heavy rain, earthworms wash into streams in large numbers, and trout gorge on them. An earthworm-colored squirmy worm is the perfect imitation. Fish it close to the banks and in slower water where worms would naturally accumulate.
White
White is an underrated squirmy worm color that works exceptionally well in clear, low water conditions. It imitates a pale aquatic worm and can be particularly effective on pressured fish that have seen every other color.
Fluorescent Green and Olive
Green squirmy worms are a sleeper pick that consistently produces fish. They work well in streams with heavy aquatic vegetation and are a great option when trout are being selective.
Glow-in-the-Dark
A unique option for low-light conditions or deep, dark runs. Charge the fly with a flashlight before casting and watch it glow underwater — a truly unusual presentation that can trigger strikes when nothing else is working.
How to Fish a Tungsten Squirmy Worm
Squirmy worms are most effective when fished dead-drift on a tight line or under an indicator. The key is getting the fly down to the fish's level quickly — which is where the tungsten bead earns its keep.
- Euro nymphing: Squirmy worms are a natural fit for euro nymphing. The tungsten bead gets the fly down fast, and the tight-line connection lets you feel every subtle take.
- Under an indicator: Set your indicator depth so the fly is drifting just above the bottom. Adjust until you start ticking rocks — that's the sweet spot.
- Dry-dropper: Trail a squirmy worm 14–18 inches below a buoyant dry fly like a Chubby Chernobyl for a deadly two-fly combination.
A Word of Caution
Squirmy worm bodies are made of soft silicone that can degrade in direct sunlight and heat. Store your squirmies in a cool, shaded location when not in use — leaving them in a hot car or in direct sun will cause the bodies to melt and unravel. Keep them in a closed fly box out of the sun and they'll last for many seasons.
Final Thoughts
Tungsten bead squirmy worms are one of the most effective trout flies ever tied. Whether you're fishing a tailwater in winter or a freestone stream in summer, having a selection of colors in your box will put more fish in your net. Start with red, pink, and earthworm, then experiment — shop the full Squirmies collection for every color we carry. Related: pair squirmies with another tungsten attractor like our Size 12 Biscuit Tungsten Eggs, or try Size 16 Baby Countach Nymphs when you want an attractor with a more nymph-like profile — and keep them all in a Small Nymph Fly Box.