Catskill caddis season peaks with prime late-spring windows ahead

What's Biting

What's Next

**The next 2–3 days**

With both gauges recording healthy spring flows — 373 cfs at gauge 01413500 and 95.8 cfs at gauge 01415000 — mainstem wading is possible but anglers should watch for any rain events that could push levels higher and temporarily stain the water. Neither gauge is reporting temperature data this week, so it is worth carrying a pocket thermometer; Catskill brown trout feed most aggressively in the 52–62°F band, which is typical for mid-May at these elevations but not guaranteed given a cold spell or heavy runoff pulse.

**What should turn on soon**

The Mother's Day Caddis (Grannom, *Brachycentrus* spp.) is the dominant hatch right now on Catskill rivers. Per Flylords Mag, this is peak pre-runoff season — if flows stay manageable, expect afternoon emergences and evening spinner falls to fire reliably through the coming week. Once the caddis push fades, Sulphur mayflies (*Ephemerella* spp.) typically begin appearing on Catskill streams in mid-to-late May, offering some of the season's best selective dry-fly fishing. MidCurrent's tying content this week covers water-column patterns specifically "as hatches begin to fire and predatory fish start pushing into the shallows" — a regional signal that feeding activity is ramping across northeastern trout water.

**Timing windows to plan around**

For the coming weekend, prioritize late-afternoon through dusk sessions when caddis activity peaks and surface-feeding fish are most visible. The waning crescent moon means low ambient light in early morning hours — overnight-feeding browns may be sluggish at first light, with the action building toward midday as water temperatures climb. A logical tactical sequence: nymph rigs fished subsurface through the morning, transitioning to dry-dropper or soft-hackle wet-fly presentations as the hatch builds in the afternoon — a progression MidCurrent's tying coverage implicitly supports across multiple recent features. Check flows at both gauges before leaving; a modest rise from rain could push the higher-volume gauge 01413500 above comfortable wading depth on mainstem stretches, while smaller tributaries and headwater runs may remain ideal.

Context

Mid-May is historically the richest window on the Catskill trout calendar. The Hendrickson hatch, which anchors late April on the region's famous limestone and freestone streams, has typically wound down by the first week of May, handing the stage to the Grannom caddis emergence and, later in the month, Sulphurs and March Browns. This succession — Hendrickson to caddis to Sulphur — is so central to Catskill fly-fishing tradition that it defines the spring season for most serious anglers in the region, and it appears to be proceeding on schedule in 2026.

The current readings of 373 cfs and 95.8 cfs at the two reporting gauges are consistent with a May tracking reasonably close to seasonal norms, though without multi-year gauge averages in this week's data it is not possible to characterize flows precisely as early, late, or normal. Flylords Mag describes the current period as a nationwide "frenzied" pre-runoff window rather than a season running behind or ahead, suggesting 2026's timing aligns with historical patterns across the Northeast.

MidCurrent's coverage of the ongoing Battenkill restoration auction — the Battenkill borders southwestern Vermont and eastern New York — offers a positive regional backdrop: continued investment in stream habitat and wild trout populations bodes well for the summer low-water period ahead. Field & Stream's reflective piece on stocked rainbow trout alongside Hendrickson hatches for wild browns captures the dual-track reality of Catskill and Adirondack spring fishing: stocked fish filling accessible public stretches while wild fish rise selectively to matching hatches on trophy and delayed-harvest sections. That dynamic is fully in play right now, and both tracks are worth fishing.