Pattern Library
Squirmy Worm fly pattern
Nymph · #40 of 129

Squirmy Worm

Also known as: Squirmy Wormy, Squirmy

Imitates: Aquatic worm or earthworm washed into the river

Quick Reference

Best Sizes
#10-14
Best Season
Year-round, peaks after rain or during high/dirty water
Best Conditions
Stained water, post-rain, high flows, spring runoff
Water Temp
Any
Recommended Tippet
3X-4X fluorocarbon

How to Rig It

Lead nymph on a jig hook with a tungsten bead. Drop a smaller midge or PT 18" below.

How to Present It

Dead-drift along the bottom in deep seams. The squirmy silicone material wiggles in the slightest current — that's the trigger.

Why It Works

Real worms get washed into rivers during rain and high water — trout know it and gorge on them. The silicone material moves like a live worm even in slow current. Pink and red show up in stained water and trigger strikes when nothing else does.

History

Evolved from the San Juan Worm in the mid-2010s when fly tiers discovered silicone 'squirmy' material from craft stores. It moves so much more naturally than chenille that it became the new standard.

Pro Tip

After a thunderstorm or during spring runoff, tie on a hot pink Squirmy and a #16 Hare's Ear. You'll out-fish everyone clinging to dries.

Frequently Asked Questions

Is the Squirmy Worm cheating?+

Some purists say yes. Trout disagree. It's a legitimate imitation of a real food source — earthworms washed into the river during high water.

What color Squirmy Worm works best?+

Hot pink in stained water, natural pink/tan in clear. Red and wine work during spring runoff.

Try the Fly Advisor

Not sure if Squirmy Worm is right today?

Get a fly recommendation based on live water temp, flow, sky, and time of day for any river in the US.

Open Fly Advisor
MapFly GuideStrike ZoneReportsLogTools