Free Resource · Updated 2026
Month-by-month hatch timing and fly pattern recommendations for the Moose River in 2026. A remote Somerset County freestone river near Jackman holding wild brook trout and landlocked salmon with strong hatches from late May through September.
Moose River Hatch Calendar — Quick Reference
The Moose River drains a large watershed in western Somerset County, flowing through Attean and Long Pond before joining the Kennebec River near Jackman. The river corridor runs through undeveloped timberland and sees relatively light fishing pressure. Jackman is one of the gateways to the Moose River Bow Trip, a classic Maine canoe route.
Wild brook trout inhabit the river from its headwaters to the Kennebec confluence. Landlocked salmon are present in the sections connecting the ponds and lakes in the system. The river fishes best at moderate flows in summer and early fall. Spring runoff keeps the river high and discolored through May.
The hatch season begins in earnest in late May when flows start to drop. Green Drakes arrive in early June and produce some of the best dry fly fishing of the year. Caddis are the backbone of the summer season. Isonychia in September rounds out the year on the river.
See the full Maine Fly Hatch Chart for hatch timing across all of Maine's top trout streams.
Check Conditions Near Moose RiverWhat to Fish
Ephemera guttulata
The Green Drake hatch is the peak event on the Moose River. Large duns come off at dusk in early June and both brook trout and landlocked salmon feed actively on the surface. Local camps and outfitters around Jackman can tell you exactly when to expect the hatch in a given year.
Recommended: Coffin Fly, Comparadun Drake #8-10
Brachycentrus sp.
Caddis are the most reliable hatch on the Moose River. Evening hatches run consistently from late May through August. The brook trout are willing and a size 16 Elk Hair Caddis does most of the work. Fish the slower pools and eddies behind boulders in the evening.
Recommended: Elk Hair Caddis, X-Caddis #14-18
Isonychia sp.
September Isonychia hatches bring the big brook trout to the surface for the last good dry fly fishing of the year. The Moose River in September is uncrowded and the fall foliage around Jackman makes for one of the more scenic fishing experiences in Maine.
Recommended: Parachute Iso, Comparadun #10-12
Baetis sp.
BWOs fire on overcast days in spring after ice-out and again in October. Spring fishing can be limited by high water, but fall BWOs in October can be excellent on mild afternoons. A size 20 Sparkle Dun is the standard fly for both spring and fall olives on the Moose River.
Recommended: Sparkle Dun, Parachute Adams #18-22
Common Questions
The Moose River is known for wild brook trout and landlocked salmon in a remote, undeveloped setting. The Jackman area sees a fraction of the pressure of more southern Maine rivers. It is also the starting point for the Moose River Bow Trip, a famous Maine canoe route.
Yes. Landlocked salmon are present in the sections connecting Attean Pond and Long Pond. They are also found in the lower river near the Kennebec confluence. Brook trout dominate the smaller tributaries and upper headwater sections.
June for the Green Drake hatch is the top pick. Late August and September are excellent for Trico and Isonychia fishing with lower pressure. The river can run high and murky in May from spring runoff.
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