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21-acre lake in Park County, Montana. The lake tops out around 50 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. What the data behind the map says about each species, season by season:
The drawn water covers 24 acres wrapped in 1 miles of bank. A middling shoreline index (1.5) gives it some bays to work without being a maze. About 30% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. End to end it runs roughly 0.3 mi, about 0.2 mi across. Park County claims this one. If the bite dies, Aero Lake, Lower is 1 mi to the southeast.
Start shallow in spring: cutthroat trout sit in 3 to 15 ft that time of year. Summer pushes them deeper, 10 to 35 ft, and winter fish settle into 10 to 40 ft. The spot to know is Main-lake point, a point in about 18 ft of water that rates prime for cutthroat trout in fall. Warm-month bites cluster around early morning and the evening. Throw a trolled spoon (small) or an inline spinner until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | Main-lake point (18 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Main-lake point (18 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (18 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Main-lake point (18 ft) | Small jigging spoon, Marabou jig |
The chart marks 4 structure features on Zimmer Lake; the deepest is Deep basin at about 49 ft.
Season dates, license requirements, and size and bag limits for Montana waters are set by the Montana Fish, Wildlife & Parks — and special regulations can apply to Zimmer Lake specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Zimmer Lake is about 50 ft (15 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target cutthroat trout on Zimmer Lake.
Main-lake point is the top-rated area: a point in about 18 ft of water that rates prime for cutthroat trout in fall. Open the map above to see every rated spot for each species and season.
For cutthroat 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.
Fishing on Zimmer Lake is regulated by the Montana Fish, Wildlife & Parks. Check the official Montana regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Aero Lake, Lower 1 mi · Goose Lake 1 mi · Cavity Lake 2 mi · Aero Lake, Upper 2 mi · Lone Elk Lake 3 mi · Glacier Green Lake 3 mi · Recruitment Lake 3 mi · Rough Lake (Park) 3 mi · Long Lake (Park) 3 mi · Huckleberry Lake 3 mi · Sky Top Lakes (Park) 3 mi · Round Lake 3 mi
See how Zimmer Lake stacks up: best cutthroat trout lakes in Montana
More water nearby: Park County fishing maps (31 charts). Browse all Montana fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.