Rose River hatch calendar.

Year-round food source — the only consistent option on tailwaters in winter. On cold sunny days look for noses sipping clusters in slow water.

Most reliable Eastern hatch. Two emergences — spring (March-April) and fall (September-October). Best on overcast, drizzly days.

Classic Catskill spring hatch. First major mayfly of the year on many freestone streams. Emerges underwater — wet flies often outperform dries.

First substantial mayfly hatch on most Eastern rivers. Spinner falls in evening can be as productive as the dun emergence.

First major caddis emergence of the year. Look for clouds of small dark caddis above riffles in late afternoon.

Sporadic emergence rather than a heavy hatch — but trout key on individual large duns drifting through. Freestone-river specialty.

The most important mayfly hatch on Eastern rivers. Reliable emergence + spinner fall every evening for 4-6 weeks. Match the spinners with rusty-bodied patterns.

Pale yellow-cream mayfly. Less intense hatch than Sulphur but reliable across many Eastern rivers in late spring through early summer.

Common on freestone rivers. Adults flutter back to lay eggs on warm afternoons — trout target the egg-laying females.

Workhorse summer caddis. Heavy emergences and egg-laying flights at dusk through summer. Drop a soft hackle on the swing during the evening.

Long-running hatch from June into October. Nymphs are strong swimmers and crawl out of the water to emerge — fish a swung wet fly through riffles.

Not a hatch but the most important summer trout food in many Eastern systems. Fish tight to grassy banks and overhanging trees. Hopper-dropper rigs are deadly July through September.

Large orange-bodied caddis. The big fall food source on cold freestone rivers. Trout eat them all day in October but the egg-laying flight at dusk is the most explosive feeding.