Every spring, I pay particular attention to what's happening around the area. I live next to a wetland and every year there is one day, sometimes in February sometimes March, when every frog starts croaking....like somebody threw a switch. Then the ***** willows come out, then the cherry trees bloom. When the dogwoods flower they're on the beds. All these "happenings" tip me off to what phase the fish are in. I'm sure you know the importance of water temp so I won't mention that. In the fall, first frost tells me the smallmouth will be stocking up. In my area....dark fish are on rocks, light colored fish are on weeds. Good luck