Lake County, MT · Lake
Flathead Lake
The largest natural freshwater lake west of the Mississippi in the lower 48 — nearly 200 square miles of cold, clear water below the Mission and Swan ranges. A premier lake trout (mackinaw) fishery worked by deep trolling and jigging, with yellow perch and lake whitefish for lighter tackle. Native bull trout are fully protected.
Live · updated
Top pick today
Lake Trout — Workable day for Lake Trout.
Best conditions of 2 species tracked at Flathead Lake.
Atmosphere
Water
Sun & Moon
Species at Flathead Lake
2 species tracked, ranked by today's conditions. The top pick is open below — tap any species to expand it, or a chip to focus.
#1 Lake Trout Workable day for Lake Trout. In season 68/100
What's helping
- 14 mph wind — light chop — baitfish active, fish willing to feed
About. Salvelinus namaycush — The native deepwater char of the Great Lakes and cold northern lakes. Holds in cold, deep water through summer and moves shallow to reefs in spring and fall. Targeted by deep trolling, jigging, and from shore early and late in the season.
Prefers. Water 40–52°F (ideal 48°F) · either tide · depth 30–200 ft.
- Daily creel
- 20
Western District: 20 lake trout daily, 40 in possession — Flathead Lake actively encourages mackinaw harvest to protect native bull and westslope cutthroat trout.
Source: Montana Western District regulations · verified 2026-06-01.
#2 Yellow Perch Workable day for Yellow Perch. In season 62/100
What's helping
- 14 mph wind — light chop — baitfish active, fish willing to feed
What's hurting
- incoming tide — yellow perch prefers slack tide
About. Perca flavescens — Late-winter and early-spring favorite. Schools up in tidal tributaries for the pre-spawn run in February and March, taking small minnows, shad darts, and small jigs. A classic Eastern Shore "neds" fishery.
Prefers. Water 45–70°F (ideal 58°F) · slack tide · depth 5–30 ft.
- Daily creel
- no limit
Yellow perch are not on Montana’s standard limit list — no daily or possession limit in the Western District. Confirm any water-specific exception before keeping a big catch.
Source: Montana Western District regulations · verified 2026-06-01.
Location Info
Water Body
Lake
Access
Pier, shore, and ramp
Jurisdiction
Montana Western District
Coordinates
Local reports & rules for Flathead Lake: Montana FWP fishing & regulations → · fish-consumption advisories (EPA directory) →
Nearby Access Points
Frequently Asked
Do I need a fishing license to fish at Flathead Lake?
Yes (anglers age 16 and older). To fish at Flathead Lake you need the appropriate state fishing license. See the agency's current rules: the state agency website
What fish are commonly targeted at Flathead Lake?
Flathead Lake is listed on this site for 2 commonly-targeted species: Lake Trout, Yellow Perch. Which species is currently in season and which is scoring highest today is shown in the per-species ranking on this page.
When is the best time to fish at Flathead Lake?
It depends more on the species and the day's conditions than on a fixed "best hour." Water temperature, weather, and — at tidal locations — the stage of the tide drive activity most. The per-species ranking on this page scores every target species at Flathead Lake against today's live conditions, so the fish near the top are your best bets right now; check back as conditions change through the day.
What kind of access does Flathead Lake have?
Flathead Lake has multiple access types — pier, shoreline, and at least one public boat ramp.
Which state's fishing regulations apply at Flathead Lake?
state agency regulations apply at Flathead Lake. Size limits, creel limits, and seasonal closures are listed per species on each species page. Always confirm against the agency source linked from each regulation block — emergency closures can take effect mid-season.
Is Flathead Lake tidal water?
No. Flathead Lake is non-tidal — water level varies with rainfall, seasonal flow, and (where applicable) upstream dam releases rather than tidal exchange.