Indiana's Lake Michigan Shore Enters Peak Chinook Season Under the Full Moon

What's biting

What's next

Without live water temperatures or current gauge readings this cycle, specific predictions carry more uncertainty than usual. That said, late June on southern Lake Michigan follows a reliable seasonal arc worth planning around.

**Thermocline positioning.** Surface temps in the nearshore zone typically reach the upper 60s by late June, while the thermal refuge below the thermocline -- usually at 60 to 100 feet on the southern end of the lake -- holds in the low-to-mid 50s where Chinook salmon concentrate. Trolling spoons and flasher-fly rigs on downriggers targeting that depth band is the standard June approach. Without a live temperature reading, probing with a downrigger probe or watching for screen marks on a sounder around 60 to 80 feet is the best way to dial it in once you're on the water.

**Full moon timing.** The full moon fell on June 28, and wind-driven seiches and current concentrations at breakwaters and harbor mouths can be pronounced around this phase even on a freshwater system. The low-light window at first light Sunday through Tuesday morning is the highest-percentage trolling time for salmon as the moon wanes from full. Midday action typically softens as light intensifies.

**Coho.** Typically accessible shallower than Chinook in late June -- 40 to 70 feet near harbor-mouth current seams -- and often more willing during midday than their larger cousins. Spoons in chartreuse, blue, or natural silver are reliable in this water and depth range.

**Perch and smallmouth.** Yellow perch off pier structures and rocky nearshore rubble should be in reasonable summer form. Smallmouth are post-spawn and actively feeding; goby-imitating soft plastics on a drop-shot or ned rig are a logical choice given what Wired 2 Fish describes as the "unexpected silver lining" of round gobies reshaping Great Lakes forage dynamics.

Verify local launch conditions and the wind forecast before committing to an offshore run -- sustained southwest or northwest winds can generate rough conditions quickly on this shallow southern section of the lake.

Context

Late June is historically one of the two or three best months on the Indiana shoreline of Lake Michigan. The Chinook salmon stocking program has made the southern end of the lake a consistent summer trolling destination, with the thermocline typically locking in by mid-June and holding bait -- and salmon -- at predictable depths through July before surface temperatures moderate in late summer.

The WI DNR Lake Michigan Fishing Report put 2024 in the record books for lake-wide salmon production: coho numbers exceeded 210,000, a new record, while Chinook topped 160,000, the best since 2012. The DNR attributed both to improved alewife survival in recent years, which directly increased stocked-fish survival rates. That forage dynamic applies to the full lake system, including Indiana's southern ports, and suggests the fishery entered the 2025-2026 cycle on a strong footing.

Wired 2 Fish's recent feature on round gobies adds a useful long-term lens: the invasive species, once uniformly criticized, has quietly become a meaningful forage supplement for salmon, lake trout, and smallmouth across the Great Lakes. Anglers near Indiana's ports have increasingly adopted goby-imitating presentations over the past decade in step with this shift, and it has paid off.

IL/IN Sea Grant operates nearshore monitoring buoys in southern Lake Michigan -- the network closest to Indiana's shoreline -- but no live readings came through this cycle's data pull. For late-June reference, surface temps in this zone typically run 65 to 72°F nearshore, dropping to the low 50s below the thermocline. No charter, tackle-shop, or state agency fishing intelligence specific to Indiana's Lake Michigan ports appeared in this cycle's feeds; the sketch above draws on lake-wide context and seasonal norms rather than current ground-truth. Treat it as background until local reports surface.