I catch some of my biggest Pike in southern Ontario in the Spring right after opening season and in late fall when water temperatures drop. My pattern to catch Pike that average 36-40″ is to fish any green aquatic vegetation that is gowning in 7-10′ off water off shorelines.
My favorite way to cover water and get bigger Pike to strike is to fish crankbaits that dive down to 10′ and that have a wide wobble. Some of my favorite colors are bright yellow and chartreuse with a black back. I find that using a steady, slower retrieve works best. If I hit a weed I snap my rod tip and it usually falls off. Some of the best locations to target large fall Pike is Lake Ontario marina basins, river and creek mouths and any weedy bays that meet deeper water.