What to expect at the Fox River mouth

The Fox River mouth, where the river empties into Lake Michigan near Green Bay, is a transition zone that holds walleye, smallmouth bass, and lake trout depending on the season. The river channel narrows as it approaches the lake, creating a natural funnel that concentrates fish during their seasonal movements. Water temperature and current speed shift dramatically here—the river stays warmer in spring and fall, while the lake moderates summer heat and winter cold.

Access is straightforward: you can fish from the public boat launch at the mouth itself, or from the jetties and breakwalls that frame the channel. The bottom is a mix of sand, gravel, and rock, which holds forage fish and attracts predators. Conditions change fast—wind direction and strength off Lake Michigan can turn the mouth from fishable to rough in an hour, so check the forecast before you go.

Key Takeaways

  • The Fox River mouth holds walleye year-round, with peak activity in spring (April–May) and fall (September–October) when fish move between river and lake.
  • Smallmouth bass are present May through October, with summer being the most reliable season for consistent catches.
  • Lake trout move into the mouth in late fall and winter when they leave deeper water to feed in shallower zones.
  • A Wisconsin fishing license is required; check current regulations for species-specific rules, which change annually.
  • Wind and wave height from Lake Michigan can make the mouth unfishable within hours, so plan around weather windows.

Spring fishing: April through May

Spring is the most productive season at the Fox River mouth. Walleye move out of the river into the lake as water temperatures climb, and they concentrate in the mouth during this transition. Fish the channel edges and around the jetties in 8 to 15 feet of water using live shiners, crawlers, or jigs tipped with minnows. Early morning and evening produce better than midday, but overcast days can be active all day.

Smallmouth bass begin showing up in late April and May as the water warms. They hold around the rock jetties and breakwalls where current creates feeding zones. Cast crankbaits, soft plastics, and topwater lures along the structure. The mouth is less crowded than inland lakes during spring, so you can work the same productive spots without fighting boat traffic.

Summer conditions: June through August

Summer brings consistent smallmouth bass fishing and occasional walleye, though the bite is less predictable than spring or fall. Smallmouth stay active around the jetties and deeper channel zones, especially early and late in the day. Water temperatures in the mouth can reach 70°F or higher by mid-July, which pushes walleye deeper into the lake or back upriver into cooler water.

Lake Michigan wind is strongest in summer, and afternoon waves can shut down fishing by mid-day. Plan to fish early morning or wait for calm evenings. Bring extra fuel if you're running a boat—the mouth is only a few miles from the launch, but rough water makes the return trip slower and more fuel-intensive than the outbound run.

Fall migration: September through October

Fall rivals spring as the best time to fish the Fox River mouth. Walleye move back into the river system as water cools, and they stage in the mouth before heading upstream. Fish the same jetty and channel-edge zones you worked in spring, using live bait or jigs. Water temperatures drop into the 50s by late October, and the bite can be excellent even during the day.

Smallmouth bass remain active through September and into early October. By late October, they've moved to deeper water or back into the river. Fall weather is more stable than summer, with fewer afternoon wind events, though you should still check conditions before launching.

Winter and late fall: November through March

Winter fishing at the Fox River mouth is possible but limited by ice and weather. Lake trout move into shallower water in November and December as the lake cools, and the mouth becomes a staging area before they move to deeper winter habitat. Fish 15 to 30 feet of water with jigging spoons or live shiners. The season is short—by January, ice can make access difficult or impossible depending on how cold the winter is.

Walleye remain in the system but are less concentrated than in spring and fall. If you fish winter, bring a depth finder to locate the channel and any structure. Conditions deteriorate quickly, so fish early and leave before afternoon wind picks up.

Access and regulations

The primary public launch is the Fox River mouth boat launch, located at the end of Riverside Drive in Green Bay. It's a single-lane concrete ramp with limited parking—arrive early during peak season. The launch fee is typically a few dollars, though this can change. Nearby, you can also fish from the public jetties and breakwalls without a boat, though access is weather-dependent and can be slippery when wet.

A Wisconsin fishing license is required for anyone 16 and older. You can purchase a daily, three-day, or annual license online through the Wisconsin Department of Natural Resources website or at local bait shops. Walleye, smallmouth bass, and lake trout all have size and bag limits that vary by year—check the current Wisconsin fishing regulations before you fish. Some years have slot limits on walleye (meaning you can keep fish only within a certain size range), so verify the rules for the season you're planning.

Gear and tactics

For walleye, a 6- to 7-foot medium-action spinning rod with 8- to 10-pound monofilament or braided line works well. Jigs in the 1/4- to 3/8-ounce range are standard; tip them with live shiners or crawlers. Crankbaits that dive to 8 to 12 feet are also effective, especially in spring and fall.

Smallmouth bass fishing calls for a similar rod setup, but you can use slightly heavier line (10 to 12 pounds) because bass are less line-shy than walleye. Crankbaits, soft plastics (4- to 6-inch), and topwater lures all work. Cast along the jetties and let current carry your lure into feeding zones.

For lake trout in winter, a jigging setup with a shorter rod (5 to 6 feet) and heavier jigs (1/2 to 1 ounce) is more efficient. Drop vertically in the channel and work the lure with short, sharp lifts. A depth finder is nearly essential for winter fishing—it shows you the channel and any suspended fish.

Frequently Asked Questions

Do I need a boat to fish the Fox River mouth?

No. You can fish from the public jetties and breakwalls without a boat, though access is weather-dependent and the rocks can be slippery. A boat gives you more flexibility to reach deeper water and move with the fish, but many anglers catch walleye and bass from shore during spring and fall.

What's the difference between fishing the river channel and the lake side of the mouth?

The river channel (the deeper cut running into the lake) holds more concentrated fish during migration periods and is where current creates feeding zones. The lake side is shallower and more exposed to wind, but can hold fish during calm conditions. In spring and fall, focus on the channel; in summer, the lake side can be productive early and late in the day.

Can I fish the mouth in winter?

Yes, but conditions are unpredictable. Lake trout move into the mouth in November and December, and walleye remain present. By January, ice and weather often make access difficult. Check local conditions and ice reports before planning a winter trip.

What's the best time of day to fish the Fox River mouth?

Early morning (sunrise to mid-morning) and evening (two hours before sunset onward) are most productive, especially in summer. Spring and fall can be active all day, particularly on overcast days. Avoid midday in summer when water temperature peaks and wind is strongest.

How far is the Fox River mouth from Green Bay?

The mouth is within Green Bay itself, just a few miles north of downtown Green Bay. The boat launch is accessible from Riverside Drive. Running time from the launch to open water is only 10 to 15 minutes, making it an easy destination for a half-day trip.