The October Caddis hatch is one of the most exciting dry fly fishing events of the year in the Pacific Northwest — and if you're not on the water for it, you're missing out. Despite the name, this hatch begins in September across much of Oregon and Washington as temperatures drop at higher elevations and along the coast.
Here's everything you need to know to make the most of October Caddis season.
Why the October Caddis Hatch Is a Dry Fly Angler's Dream
What makes the October Caddis hatch so productive? Start with convenience. These large, orange, multi-winged insects closely resemble a scaled-down salmon fly — which means your existing box is probably already dialed in. A Clark's Stone, an orange Stimulator, or a size-down orange Chubby Chornobyl will all produce. Gear-wise, you're set too — fish October Caddis patterns on small streams with light tackle, or target big fish on big rivers with a 5- or 6-weight.
October Caddis Fishing: West vs. East of the Cascades
This is one of the rare hatches that actually fishes better west of the Cascades than east. October Caddis are present on rivers like the Metolius, Crooked, and Deschutes — and they produce solid dry fly action, especially heading into autumn. But east-side fish don't respond with the same intensity. West of the Cascades is where this hatch truly shines.
Why Coastal Cutthroat Trout Go Crazy for October Caddis
West of the Cascades, the dominant resident trout is the coastal cutthroat — and coastal cutts, in both their resident and searun forms, have a well-documented obsession with two things: movement and the color orange.
The October Caddis is by far the most abundant orange insect to hatch west of the Cascades each fall. Coastal cutthroat are ambush predators built to dart out and snatch active prey — and a big, skittering orange caddis on the surface is exactly what triggers that response. The result is some of the most aggressive, visual dry fly fishing you'll find all year.
Where to Fish the October Caddis Hatch in Oregon
One of the best things about this hatch is the variety of water it covers. You can find productive October Caddis fishing across a wide range of Oregon environments:
- High desert rivers: Crooked River, Deschutes River
- Alpine lakes: Timothy Lake, Harriet Lake
- Willamette Valley rivers: Lower North Santiam, Middle Fork Willamette
- Small streams: Oak Grove Fork
- Coastal tributaries: Nehalem River, Wilson River
Whether you're chasing cutthroat on a coastal stream or hunting big trout on a high desert river, October Caddis season offers some of the most diverse and rewarding dry fly fishing of the year in the Pacific Northwest.
October Caddis Lifecycle & Angler Guide
If you fish the Pacific Northwest in the fall, you know the October Caddis (Dicosmoecus gilvipes). This massive, orange-bodied insect drives trout wild. Understanding its one-year life cycle and preferred water types is your ticket to matching the hatch at every stage — from riverbed to air.
1. The Egg Stage (Late Fall)
- What's happening: Females drop gelatinous egg masses directly into the river after mating.
- Where to fish: Target slow-moving tailouts and soft pool edges where floating adults drop eggs and spent spinners fall to the surface.
2. The Larva Stage (Winter through Late Summer)
- What's happening: Larvae build heavy, tube-like cases out of pebbles and crawl the river bottom grazing on algae, growing up to two inches long over several months.
- Where to fish: Fish heavy, weighted nymphs through fast riffles and the heads of deep runs. Look for clean, cobblestone riverbeds — that's prime October Caddis larva habitat.
3. The Pupa Stage (Late Summer through Early Fall)
- What's happening: Larvae glue their stone cases to boulders to pupate. Once mature, they cut free and swim vigorously toward the surface.
- Where to fish: Swing soft-hackles or pupa imitations through deep, turbulent runs and pocket water behind large boulders, where emerging pupae get swept downstream.
4. The Adult Stage (September through November)
- What's happening: Winged adults emerge looking like giant, orange moths — clumsy fliers that frequently end up on the water.
- Where to fish: Skitter large dry flies near shaded treelines, overhanging banks, and creek mouths. Wind blows these adults off branches and right into the strike zone.