Prime coho season arrives off Chicago as Lake Michigan's May window builds

What's Biting

What's Next

Over the next two to three days, conditions off Chicago's lakefront will be governed primarily by wind direction and any frontal passages moving through the region. Lake Michigan can turn quickly in May — check the local forecast before any launch decision and have a bail-out plan if northeast winds develop.

With the waning crescent moon phase through mid-week, low-light feeding windows are compressed. The most productive bite windows typically shift slightly later in the morning and earlier in the afternoon rather than the hard pre-dawn edge that a full or new moon favors. The lunar cycle tips toward new moon in the coming week, which often reactivates feeding intensity — worth noting for weekend anglers planning ahead.

For coho, this is the heart of the spring window. Fish stage off Chicago harbor mouths and along the developing nearshore thermocline as surface temps climb toward summer levels. The WI DNR Lake Michigan Fishing Report tied 2024's record coho haul directly to robust alewife forage — those same bait schools remain a primary driver in 2026. Early May typically sees coho chasing alewife in the upper water column before stratification solidifies. Trolling crankbaits and spoons at slow-to-moderate speeds covers water efficiently during this period; chartreuse, blue-chrome, and natural silver patterns have historically performed well in these conditions, though color preference can swing day to day.

Chinook are building in deeper water adjacent to the coho zone, typically holding further down on the developing thermocline. As May progresses and surface temps rise, expect Chinook to become increasingly accessible on a spread; by late May and into June, they become the primary target off the Chicago shoreline.

Smallmouth bass near Chicago's piers, breakwalls, and harbor rocky structure are in or approaching spawning mode in mid-May — look for aggressive fish on tube jigs and soft plastics in the shallower nearshore zone. Yellow perch action remains typical for this time of year. South and southwest winds generally produce cleaner water off Chicago's lakefront; north and northeast winds can push cold, off-colored water toward shore and slow action considerably, so wind checks before departure are non-negotiable.

Context

Mid-May is consistently one of the most active periods on Chicago's stretch of southern Lake Michigan, bookended by the coho spring run and the building Chinook fishery. The region historically follows a predictable seasonal arc: coho enter nearshore waters as early as late March and concentrate in fishable density through May, while Chinook build through spring and hit their stride in early summer.

What makes the current season notable is the forage base leading into it. The WI DNR Lake Michigan Fishing Report documented record 2024 coho harvest — over 210,000 fish — and 160,000-plus Chinook (the highest since 2012), attributing both to strong alewife year classes that boosted stocked fish survival. The cohorts now entering catchable size had exceptional forage conditions during their formative period. This represents a meaningful bounce-back from leaner years in the 2010s when alewife scarcity suppressed salmon survival and eroded nearshore catch rates off Chicago.

No direct comparison data for 2025 or current early-2026 conditions is available in today's intel feeds. IL/IN Sea Grant's nearshore Lake Michigan buoy network provides continuous physical monitoring — the program notes that spring buoy deployment is underway — but no current readings were captured for this report. Anglers looking for year-over-year pattern comparison should cross-reference live buoy data from the IISG network before assuming depth zones and timing match prior seasons exactly. Water temperatures in any given spring can shift the calendar for coho staging by one to three weeks in either direction, and without a current surface temp reading, treating last year's exact coordinates and depth charts as gospel is a risk.