Southern Lake Michigan salmon season builds into late-June trolling peak

What's biting

What's next

The next several days represent the heart of the summer Chinook salmon trolling season on southern Lake Michigan. Even without confirmed surface-temperature readings from the Indiana side this cycle, late-June patterns here are well-established: the thermocline — typically forming in the 30–60 foot depth range by mid-to-late June — becomes the key depth band to work. Anglers trolling downriggers and leadcore set to run at or just above that cold-water break consistently find the most aggressive fish. Spoons and stick baits in alewife-imitating finishes (silver, chartreuse, and blue-chrome) have historically produced on the Indiana offshore marks.

The Waxing Gibbous moon through the weekend leans in favor of feeding activity, particularly during the low-light edges — the hour after sunrise and the final hour before dark often yield the most active bite near piers and harbor mouths. Nearshore smallmouth bass should be very active through the weekend given peak summer light and warming shallows; rocky jetties, pier pilings, and breakwalls are the prime structures to target with tubes, drop shots, or swimbaits.

Yellow perch remain a reliable option at depth, particularly over sandy lake-bottom flats in 20–35 feet. No specific per-pier intel from Indiana arrived this cycle, but the perch bite in southern Lake Michigan has historically held steady through June and into July.

The WI DNR Lake Michigan Fishing Report noted that strong alewife forage classes have sustained elevated salmon returns in recent seasons. As long as that forage base remains healthy in the southern basin, the Chinook bite offshore of Michigan City and the Indiana Dunes corridor should stay productive through July. Watch for south or southwest winds — they tend to push warmer surface water offshore and upwell cooler, bait-holding water nearshore, which can shift the productive depth band shallower and compress action toward the harbor mouths.

IL/IN Sea Grant operates three nearshore monitoring buoys in southern Lake Michigan. Checking that network before departure gives you current surface temperatures and wave conditions — critical inputs for dialing in the right downrigger depth and deciding whether small-boat conditions are safe.

Context

Late June on Indiana's Lake Michigan shoreline is typically the seasonal hinge between the spring coho run and the summer Chinook buildup. By mid-June in most years, coho activity has largely tapered off at the southern end of the lake; Chinook, planted through Indiana and Illinois stocking programs in the southern basin, become the primary trolling target from now through September.

The WI DNR Lake Michigan Fishing Report's documentation of 2024's record coho harvest — exceeding 210,000 fish lakewide — and the strongest Chinook showing since 2012 suggests the stocking investments and alewife forage recovery are delivering results across the full lake. While those harvest figures are tallied at Wisconsin ports, the same stocked cohorts range across the entire basin and contribute to Indiana's offshore fishery.

A Wired2Fish feature this week provided useful broader context: round gobies, once viewed purely as an invasive problem, have become a significant secondary forage base for Chinook, lake trout, and smallmouth bass throughout the Great Lakes. For the Indiana shoreline, where gobies colonized rocky nearshore areas years ago, this has translated into improved smallmouth and lake trout populations near structure — a development consistent with the fishing pressure anglers have directed toward Indiana Dunes-area jetties and pier heads in recent seasons.

No direct reporting on Indiana-specific harvest or charter activity arrived in this update cycle, making precise year-over-year comparison impossible. Absent that local signal, current conditions are best read as on schedule for a typical late-June Great Lakes season. Check IL/IN Sea Grant buoy data and local charter captains out of Michigan City for ground-level intel before your trip.