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Fishing Flathead Lake: what the data says
122,000-acre reservoir near Polson. The lake tops out around 380 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. Below is the species-by-species picture, pulled from the same data the map uses.
Rainbow Trout fishing at Flathead Lake
Start shallow in spring: rainbow trout sit in 5 to 20 ft that time of year. They move out to 8 to 30 ft in summer and finish the year down in 8 to 40 ft. If you only fish one area, make it Shoreline point: a point around 16 ft that scores prime in spring. Plan around early morning and the evening in the warm months. A dodger + spoon (deep troll) or a flutter spoon covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Jigging spoon, Tube jig (white) |
Yellow Perch fishing at Flathead Lake
In spring, yellow perch run shallow here, mostly 3 to 12 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 15 to 35 ft. The spot to know is Shallow bay flat, a weed flat in about 10 ft of water that rates prime for yellow perch in spring. Best bite is early morning. Summer baits: a drop-shot micro plastics or a small spoon tipped with worm gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 10 to 30 ft | dawn | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 12 to 35 ft | midday | Jigging spoon (small), Perch rig / spreader |
| Winter | 15 to 35 ft | midday & dawn | Tungsten jig + spikes, Rattle spoon (small) |
Northern Pike fishing at Flathead Lake
Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. By summer they slide out to 8 to 20 ft, and by winter most fish are in 5 to 15 ft. If you only fish one area, make it Weed flat: a weed flat around 7 ft that scores prime in spring. In summer the feeding windows fall in early morning and the evening. A bucktail or a weedless spoon over cabbage covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Tip-ups, Large jigging spoon |
Lake Trout fishing at Flathead Lake
In spring, lake trout run shallow here, mostly 10 to 40 ft. They move out to 50 to 120 ft in summer and finish the year down in 20 to 80 ft. If you only fish one area, make it Rock reef: a rock pile around 39 ft that scores prime in fall. Best bite is early morning. Tie on a white tube jig (deep) or a magnum spoon on downrigger and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 50 to 120 ft | dawn | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | White tube jig, Airplane jig |
Notable structure
- Deep basin: deep basin, around 371 ft
- Deepest basin: deep basin, around 221 ft
- Sharp break: drop-off, around 188 ft
- Sharp break: drop-off, around 184 ft
- Break off the point: drop-off, around 161 ft
- Sharp break: drop-off, around 144 ft
- Sharp break: drop-off, around 134 ft
- Sharp break: drop-off, around 124 ft
- Sharp break: drop-off, around 108 ft
- Shallow feeding flat: feeding flat, around 97 ft
- Sharp break: drop-off, around 76 ft
- Offshore hump: offshore hump, around 58 ft
- Main-lake point: point, around 50 ft
- Offshore hump: offshore hump, around 49 ft
Common questions
How deep is Flathead Lake?
Flathead Lake is about 380 ft at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
What fish are in Flathead Lake?
Anglers target northern pike, rainbow trout, yellow perch, lake trout on Flathead Lake.
Where is the best fishing spot on Flathead Lake?
Shallow bay flat is the top-rated area: a weed flat in about 10 ft of water that rates prime for yellow perch in spring. Open the map above to see every rated spot for each species and season.
When is the best time to fish Flathead Lake?
For rainbow trout, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Nearby waters
Jette Lake · Horseshoe Lake (Lake) · Lake Mary Ronan · Loon Lake (Lake) · Mccaffery Lake · Peterson Lake
See how Flathead Lake stacks up: best northern pike lakes in Montana · best rainbow trout lakes in Montana · best yellow perch lakes in Montana · best lake trout lakes in Montana
Browse all Montana fishing maps or every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. For fishing guidance only, never navigation.