Sulphur Season Peaks on Catskills and Adirondack Trout Streams

What's Biting

What's Next

The new moon on June 15 creates a genuinely favorable setup for daytime dry-fly fishing across both the Catskills and Adirondacks. Without bright moon nights suppressing nighttime feeding, trout tend to remain active through the daylight hours rather than loading up after dark and going quiet by morning. The classic evening concentration at dusk — when sulphurs and caddis typically peak — remains the day's premier session, but morning caddis activity can extend quality surface fishing well into the early hours. Plan to be on the water at first light and again from 4 p.m. through dark.

No USGS gauge data is available in this report cycle, making a pre-trip flow check essential before committing to a specific stretch of water. Mid-June flows in the Catskills and Adirondacks vary considerably depending on the spring's rainfall pattern. A wet preceding month means wading-depth flows and fish distributed throughout riffles and runs; a dry stretch can drop levels quickly, concentrating trout in deeper pools and shaded canyon reaches. If flows are lean, target riffled water with high oxygen content and cold tributary mouths through the warmest afternoon hours — that's where fish seek thermal refuge.

MidCurrent's current fly-tying coverage emphasizes a water-column approach that maps directly onto mid-June Catskill fishing: patterns from the surface film through open water to handle the full range of trout feeding behavior as hatches fire. Carry a sulphur dun and spent spinner for the evening rise, a CDC emerger for fish locked in the surface film, and a bead-head nymph or soft hackle for mid-day nymphing when no visible rise is happening. On Adirondack brook trout water, where fish are typically less pressured than their Catskill counterparts, small attractors draw confident surface strikes well into summer.

Field & Stream's temperature guide serves as a timely reminder: as afternoon air temps climb, water temperatures in flat, slow sections can approach stress thresholds for trout. Fish the bookends of the day, seek out well-oxygenated riffles and cold spring seeps, and plan your water before your flies. That discipline will matter more as the season progresses into July.

Context

Mid-June occupies a storied place in Catskill fly fishing tradition. This stretch of calendar — bridging the final major spring hatches and the onset of true summer heat — is when the classic sulphur hatch (Ephemerella dorothea) defines fishing on these freestone streams. The tradition of matching mayfly hatches with sparse, lightly dressed dry flies was largely built around conditions typical of this exact mid-June window: gin-clear water, evening rises, and selectively feeding fish. Dry-fly purists have planned pilgrimages to these streams around this hatch for generations.

None of this week's angler intel feeds include direct on-the-water reports from the Adirondacks or Catskills for 2026, so a specific year-over-year comparison isn't possible. What regional coverage does offer is context: MidCurrent's reporting on Battenkill restoration efforts reflects the broader Northeast wild trout conservation picture. The Battenkill, which enters New York from Vermont, is one of the region's benchmark wild brown trout streams, and ongoing attention to its watershed health is a broadly positive signal.

Hatch Magazine's recent guide to fishing through drought conditions — written from a Colorado Front Range perspective — carries a relevant parallel for Northeast anglers. If 2026 has seen a dry spring across New York, Catskill streams may be running lower and warmer earlier than typical, compressing the prime fishing window and pushing quality sessions toward the morning and evening bookends. It's worth checking historical gauge data for any rivers you plan to fish to gauge whether this year is tracking wet or dry relative to prior seasons.

In an average year, the second week of June in the Catskills falls near the midpoint of the best dry-fly period — after early-season runoff and well before the dog-days conditions of late July. Without specific gauge or temperature data available this cycle, the honest read is that conditions are likely within the expected seasonal range, but ground-truthing flows before a full day on the water remains essential.