Coho and Chinook lead Chicago Lake Michigan spring run in mid-May

What's Biting

What's Next

**Conditions Outlook — Next 2–3 Days**

May 11 opened with winds running stronger than forecast across the wider Great Lakes region, per Michigan Sportsman Forum posts filed this morning. That pattern can make the southern Lake Michigan basin particularly difficult — the open water off Chicago is exposed to north and northeast wind, which builds steep short-period chop quickly. Before launching, check the IL/IN Sea Grant nearshore buoy network for current wave height and wind readings; those three sensors in the southern basin provide real-time data not captured in this report.

**What Should Turn On**

Once conditions settle, the Chinook and coho bite should reward trollers working the upper 15–20 feet of the water column. Mid-May is the heart of the spring open-water run on southern Lake Michigan, and when alewife schools are concentrating near the surface — typical for this stretch of the calendar — short-lead spoons behind in-line planer boards are the proven Great Lakes spring presentation. The WI DNR Lake Michigan Fishing Report's emphasis on alewife class strength as the driver of 2024's record harvest signals that forage remains robust and should keep fish feeding actively throughout the spring push.

**Timing Windows**

With a waning crescent moon, low-light windows at dawn are worth targeting — Chinook tend to feed most aggressively before mid-morning in low-light conditions. Plan to be on station before sunrise when the forecast allows. As the moon darkens toward new over the next week, those early-morning windows may become even more productive.

If wind keeps the offshore bite challenging, nearshore structure — piers, breakwaters, and rocky points — can hold yellow perch and occasional smallmouth bass as water temps slowly climb through May. No perch-specific intel was available for Chicago in this report, but the seasonal window is right for them to become increasingly active.

Context

Mid-May is historically one of the most productive periods for open-water salmon fishing on southern Lake Michigan. The spring Chinook and coho run typically builds from late April and peaks between mid-May and early June as surface temps climb into the upper 40s to low 50s°F and alewife schools concentrate near the thermocline — a pattern that charter fleets out of the Chicago-area lakefront have counted on for decades.

The WI DNR Lake Michigan Fishing Report's 2024 data provides striking context for what's possible: record coho numbers (210,000-plus) and the strongest Chinook harvest since 2012, directly attributed to "recent years' classes of alewives" boosting stocked-fish survival. Southern Lake Michigan, including the Chicago nearshore corridor, sits at the heart of the lake's alewife habitat, making that forage species particularly important to local salmon productivity. Whether the 2025 harvest maintained that momentum is not reflected in the available sourced data, so direct year-over-year comparison for 2026 remains incomplete.

The WI DNR is also actively managing whitefish total allowable catch and holding public meetings on smallmouth bass management in northern Lake Michigan and Green Bay — broader ecosystem stewardship that, while not directly affecting the Chicago salmon run, signals attentive state-level oversight heading into the 2026 season.

Steelhead runs on southern Lake Michigan tributaries typically wind down through May, with peak spring action usually behind us by this date. Open-water steelhead remain possible but are not the primary target. The next major species transition to watch will be yellow perch consolidating on nearshore structure and smallmouth bass becoming active in rocky shallows as water temps push above 50°F through late May and into June.