Spring coho season building on southern Lake Michigan

What's Biting

What's Next

Over the next two to three days, the drivers of southern Lake Michigan's late-May salmon fishery should remain broadly consistent with seasonal norms. Without live buoy readings for the Illinois shoreline, anglers should check the Illinois-Indiana Sea Grant nearshore monitoring network before launching. IL/IN Sea Grant maintains three nearshore Lake Michigan stations that track surface temperature, waves, and wind. Water temps in the low-to-mid 50s are typical for Chicago-area waters at this point in May, keeping coho active in the upper column and reachable from piers and nearshore trolling boats.

The first-quarter moon phase is generally favorable for feeding activity and can concentrate salmon near the surface during dawn and dusk low-light windows. Trolling spoons and dodger-fly rigs in the top 20 to 30 feet of the water column is the traditional approach along the Illinois lakefront during this period. Focus runs along the lakefront within a few miles of shore where coho stage before their inshore push.

As May transitions into June, watch for nearshore coho action to intensify over the next week before gradually tapering as surface temperatures climb. Chinook (king salmon) begin appearing at depth during this window, staging on the alewife schools the WI DNR Lake Michigan Fishing Report identifies as unusually strong following back-to-back productive year classes. Getting down to 50 to 100 feet with downriggers becomes increasingly important through June as the thermocline sets up.

Yellow perch remain a reliable secondary target near pier walls, harbor jetties, and rocky bottom structure throughout this period. Brown trout hold in the nearshore zone through early June and are accessible from Chicago-area breakwaters and harbor piers during early-morning low-light casts with spoons or stick baits. No specific charter or local shop intel is available for this period, so plans should be confirmed with local operators before heading out. Late-May Lake Michigan can produce rapidly shifting wind and wave conditions that are not captured in this week's data set.

Context

Late May is historically one of the most productive windows of the year for Chicago-area Lake Michigan fishing. Coho salmon stocked by Illinois and Wisconsin return to southern Lake Michigan waters from late April through early June, making the Memorial Day period a traditional target for both pier anglers and trolling boats along the Illinois lakefront.

The broader picture from the WI DNR Lake Michigan Fishing Report is encouraging: 2024 produced record coho returns lake-wide and the best Chinook harvest in over a decade, both tied to strong alewife forage year classes. Because predator-prey dynamics play out across the full lake system, a high-harvest year on the Wisconsin and Michigan shores generally reflects lake-wide forage conditions that benefit Illinois anglers as well.

Historically, late-May nearshore temps in the Chicago zone run in the low-to-mid 50s, climbing toward the mid-60s by July. That thermal progression pushes coho deeper and farther offshore as summer advances, making this late-May to early-June window the most accessible period for pier fishermen and nearshore boat anglers targeting the species. Chinook runs, by contrast, peak in late July and August when the thermocline is established and alewives concentrate in the cold layer beneath it.

No current-season intel specific to the Illinois shoreline is available in this data pull to say whether 2026 is running ahead of, behind, or on pace with the typical seasonal timeline. Anglers should check with Chicago-area charter services and the Illinois DNR directly for stocking reports and current-season conditions before planning a Lake Michigan outing.