The walleye in "Stardew Valley" is a very important special fish in the game. If you want to catch the walleye, you need to go to a special location, such as Pelican Town or the river in the Ash Pine Forest. Mountain lakes and ash pine forest ponds are also more tricky in autumn.
Where to catch walleye in Stardew Valley
Walleye can only be caught on rainy days in the fall between 12pm and 2am.
The fishing locations are the river in Pelican Town or Ash Pine Forest, the mountain lake and the pond in Ash Pine Forest.
By far the best places to fish for walleye are the ponds in the Ash Pine Forest. Although you'll have to wait for a rainy fall, your chances of catching walleye are better here than anywhere else. Each cast has a 32% chance of catching a walleye.