Baking Frozen Salmon. Preheat the oven to 325 F. It's standard to cook salmon at a higher temperature, but heating it more gently minimizes or prevents the outer flesh from overcooking. Place a greased sheet of foil or parchment paper on a baking tray and put the salmon steak or filet on top. Because it's frozen, the estimated cooking time is extended by around 50 percent. So bake the fish for approximately 22 to 32 minutes, depending on its thickness.