Coho and Kings Building as Lake Michigan Enters Peak May Run Window

What's Biting

What's Next

Mid-May on Lake Michigan is historically one of the strongest windows of the year for salmon anglers working out of Chicago-area harbors. With the New Moon falling today, expect elevated biological activity during low-light transitions — dawn and the hour around sunset are your highest-percentage windows this week. New-moon phases correlate with bolder feeding behavior in Great Lakes salmonids, particularly coho, which tend to suspend higher in the water column and respond more aggressively to a moving presentation.

The WI DNR Lake Michigan Fishing Report's 2024 harvest data — record coho numbers and the best Chinook counts since 2012 — suggests healthy fish populations entering the current season, sustained by strong alewife recruitment. If alewife abundance has held into 2026, as the WI DNR's forage-base analysis implies it should, both coho and Chinook should be accessible across mid-depth zones before summer thermal stratification pushes them deeper. The practical salmon play is to troll spoons and flasher-fly combos in alewife-matching colors (silver, blue, and chartreuse) at 20 to 45 feet, then adjust based on sonar marks. Without current water-temperature data, follow the marks over the meter.

IL/IN Sea Grant deploys its three Lake Michigan nearshore buoys each spring; once those readings come online, surface temps in the 50–60°F range will confirm peak coho windows. Monitor buoy data as it populates through the week.

Surface conditions will shape the bass bite heavily. On The Water reports that big Great Lakes smallmouth turn aggressive on windy days, when chop and nearshore current concentrate baitfish against breakwalls, piers, and rocky points. Chicago's lakefront offers abundant hard structure to exploit. If northwest or southwest winds build into the Memorial Day weekend — typical for late May — work the windward faces of harbor walls and riprap with T-rigged soft plastics or a drop-shot rig.

Tactical Bassin reports the bluegill spawn is in full swing regionally. Where bluegill are stacked in shallow cover, bigger largemouth and smallmouth are staging close behind. Cycle in topwater frogs and swimbaits near emergent vegetation and dock edges alongside finesse presentations — the 48-hour window around a new moon is a prime time to go shallow and aggressive.

Context

Lake Michigan's Chicago shoreline follows a predictable spring rhythm: coho salmon are typically most accessible from late March through mid-May, working the nearshore zone before warmer surface temps push them offshore and deeper. Chinook runs build through May and peak through June and July in deeper offshore water. By the third week of May — right where we are now — the coho window is in its final nearshore stretch, and anglers who haven't connected yet should prioritize the next two weekends before fish slide out to deeper summer structure.

The WI DNR Lake Michigan Fishing Report places 2024 as a landmark year, with over 210,000 coho harvested (a record) and 160,000-plus Chinook (the most since 2012). The WI DNR attributes both to elevated alewife survival, which drives better stocked-fish growth and survival rates. That bodes well for the current cohort of fish entering 2026, though Illinois-specific stocking tallies — not available in current feeds — would sharpen that picture.

On the bass side, mid-May typically marks the heart of the smallmouth spawn in Lake Michigan's southern basin, with post-spawn fish beginning to appear in deeper rocky structure by the third week. The Michigan Sportsman Forum's accounts of cold northerly winds disrupting spawn timing in 2026 are consistent with a spring that has run cool across the Great Lakes region — not unusual, but it suggests spawn progression may be trailing a mild-spring year by a week or more. Expect the post-spawn bass transition to extend into early June.

Yellow perch, a staple for Chicago pier anglers, tend to be slower in mid-May, recovering from early-spring activity. The pier and harbor perch run typically improves again in late May and June as water warms and shiners concentrate near riprap. No current reports are surfacing perch as a hot bite, which aligns with typical seasonal expectations for this date.