Caddisfly Hatches from February Through April: Flies, Timing, and Presentation for Every Stage

Caddisfly activity follows a predictable three-stage progression from February through April across most of North America — larvae dominate in February, pupae and early emergers appear in March, and full spring emergences (especially Brachycentrus grannoms) take over in April. Matching each stage with the right flies and presentation is critical, because trout shift their feeding behavior with every transition. Most anglers wait for April’s adult hatches and miss two months of productive subsurface caddis fishing that can be just as good — or better — than the dry-fly spectacle.

What Caddis Flies to Use in February and Early Spring

February is larva month. Cased caddis, free-living rockworms, and net-spinners drift along the bottom in riffles and seams, and trout eat them consistently even in water as cold as 38–42°F. The two patterns that cover nearly every February situation are a cased caddis or olive-tan larva imitation in sizes 14–18 and a green rockworm (Rhyacophila-style) in sizes 12–16. Fish them tight to the bottom on a tight-line or indicator rig through the soft edges below riffles.

The exceptions are southern tailwaters and spring creeks where micro black caddis (Chimarra types) can hatch on warm afternoons — Kentucky’s Cumberland, the southern Appalachians, and Arizona’s Oak Creek all see February surface activity. Even Colorado’s Arkansas River below Pueblo can show “scout” Brachycentrus adults in late February. Carry tiny black dries and dark pupae in sizes 18–22 for these windows, and fish them with a subtle twitch rather than a dead drift.

When Caddis Pupae Become the Key Fly in March

March is the transition month most anglers overlook. Brachycentrus larvae begin pupating, and trout feed aggressively on dislodged larvae and early pupae in the weeks before the hatch materializes. On California’s Lower Sacramento, the spring caddis season starts mid-to-late March — and by month’s end, anglers can encounter “event” days where larger caddis profiles shine. In the Midwest and East, late March brings the first little black caddis windows when afternoon water temperatures climb above 45°F. The Catskills and northern New Jersey report Chimarra-type activity around 1–3 p.m. on the warmest days.

The presentation shift matters more than the fly change. Once you suspect pupae are active, switch from dead-drifting near the bottom to swinging soft-hackles (Partridge and Orange or Partridge and Peacock, sizes 14–18) across and downstream, letting the fly rise at the end of the drift — the classic Leisenring lift. A Sparkle Pupa in olive or bright green rounds out the March box. Teams of two or three soft-hackles fished through riffles are exceptionally effective during this transition.

How to Fish the April Caddis Hatch (Grannom and Mother’s Day)

April is when Brachycentrus — the Grannom, Mother’s Day, and Apple caddis — becomes a primary hatch across the Driftless, the Ozarks, Appalachian freestones, and the Northern Rockies. Adults in sizes 14–16 typically emerge in late afternoon once water temperatures reach the low 50s°F, with timing sliding earlier at lower elevations and latitudes. In the Pacific Northwest, Oregon’s McKenzie River can see blanket-style caddis starting early April, while Washington’s Yakima typically waits until late month. Northern Wisconsin’s Namekagon produces afternoon tan caddis by mid-April, and Michigan’s Upper Peninsula follows a week or two later.

The critical mistake is fishing only dry flies during heavy April hatches. Trout gorge on pupae drifting subsurface before adults reach the film, making a bright green caddis pupa on a swing-and-lift the highest-percentage approach through riffles. A dry-dropper rig — an Elk Hair Caddis on top with a pupa dropped 12–24 inches below — covers both stages. Save the pure dry-fly approach for evening egg-layers, when a deliberately skittered caddis across riffle edges imitates returning females and triggers aggressive surface takes.

By late April, tan net-spinning caddis (Hydropsyche) add a second species to the mix on many waters. A tan Elk Hair Caddis in sizes 14–16 handles this late-April expansion.

The February-through-April caddis progression rewards anglers who fish each stage for what it is — larvae deep in February, pupae on the swing in March, and a pupa-first approach even during April’s dramatic surface hatches. Start subsurface, and let the fish tell you when to go on top.

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What are the best fly patterns for early spring caddis fishing?

A cased caddis larva (sizes 14–18), green rockworm (sizes 12–16), Sparkle Pupa (sizes 14–18 in olive and bright green), and soft-hackle wets (Partridge and Peacock or Partridge and Orange, sizes 14–18) cover February through April across most regions. Add a black Elk Hair Caddis in sizes 18–20 for early-season micro-caddis and a dark Elk Hair Caddis in sizes 14–16 for April Grannoms.

When does the Mother’s Day caddis hatch start?

The Brachycentrus (Mother’s Day/Grannom) hatch typically begins in mid-to-late April in lower-elevation waters and extends into May at higher altitudes and northern latitudes. Emergence is tied to water temperatures reaching the low 50s°F and usually occurs in late afternoon. In warmer western rivers like California’s Lower Sacramento, it can start as early as mid-March.

Should I fish dry flies or nymphs during a caddis hatch?

Prioritize pupa and emerger patterns over dry flies, especially early in the hatch. Trout feed most heavily on ascending pupae before they break through the surface film — a swung soft-hackle or Sparkle Pupa through riffle edges will often outfish a dead-drifted dry. Use a dry-dropper rig to cover both stages, and switch to pure dries only when you see consistent, clean surface takes.

Do caddisflies hatch in February?

Most caddis species remain as larvae in February, but small-scale hatches do occur in warmer systems. Southern tailwaters (like Kentucky’s Cumberland), the southeastern Appalachians, and some southwestern spring creeks can produce micro black caddis (sizes 18–22) on mild afternoons. These early hatches are the exception, not the rule — February is primarily a subsurface caddis game.

What presentation works best for caddis pupae?

The Leisenring lift — casting slightly down and across, allowing the fly to sink and dead-drift, then letting it swing and rise at the end — is the most effective caddis pupa presentation. It imitates the natural ascending motion of pupae moving toward the surface to emerge. Fish it through riffle tailouts and seams where emergence is concentrated.