Luckily, not all of the vegetation dies at the same time. Weeds in or adjacent to deep water are more likely to survive into late fall than those far up in the shallows. If you spend a little time cruising the deep edges of weed flats, you should be able to see green patches. But even if you can't spot them with the naked eye, you'll see the upright stalks on your depth finder. Because pike from throughout the lake search out the remaining green weeds, large numbers of them concentrate in a relatively small area, so your odds of catching them improve greatly.