October Caddis

Telling it apart

• The year's biggest caddis: size 8–10.
• Orange to burnt-orange body, mottled tan-brown wings held tent-like at rest.
• A fluttering, slightly clumsy flight in short bursts, quite different from the direct flight of most caddis.
• Long, thread-like antennae as long as or longer than the body — a mark that instantly separates a caddis from a similar-looking stonefly or moth.
• The larva builds a coarse case of bark and leaf fragments, often finished off with small pebbles as it nears pupation.

A larva that keeps moving house

As a young larva it builds a light case from leaf fragments in slower, litter-rich stretches — margins, log jams, undercut banks. As it ages toward pupation in late summer, it rebuilds a sturdier case, often reinforced with small pebbles, and shifts toward slightly coarser substrate before sealing itself in for winter.

That means the habitat shifts with the season: look for young larvae in the leaf litter of quiet margins in summer, and late-season adults closer to structure and undercut banks, where they finished developing.

The last big dry before winter

As aquatic insect activity slows down heading into winter, this big caddis remains one of the last sizeable meals still available. Trout, without the pinpoint selectivity a Trico hatch demands, often come up for it with real confidence rather than a cautious sip.

It is nearly the mirror image of the Trico: here, the insect's size and relative abundance matter more than precision in the pattern.

A dry fly in motion

Drift it tight to undercut banks and structure, where autumn trout are holding. But keep in mind that the natural adult often keeps fluttering and skittering a little once it lands on the water — a perfectly dead drift is not always what triggers the take.

A small twitch or a subtle skate imitates that behaviour, and a Stimulator, buoyant and bushy, is built for exactly that kind of movement without sinking.