You have to find the local food sources and then find out which ones the bears happen to want to eat when you are out hunting them. Remember that what you "think" they should be eating does not necessarily mean that is what they bears want to be eating.
Here in AZ there are lots of food choices. Some fall options may include prickly pear fruit, wild grapes, wild raspberries, fresh grass (if heavy monsoon), manzanita beans, mesquite beans, acorns, juniper berries, carrion (unrecovered elk/deer from hunters), hackberries, etc. Note where everything is as it may be useful in future hunts. Just because it is not "ready to eat" this hunt, it doesn't mean they won't be "on" during future hunts.
I'll glass for the first couple of hours, pound the trails looking for fresh sign, and then glass the last couple of hours. When looking at the fresh sign, see what they are eating and then keep an eye out for it while glassing and pounding dirt. Rinse and repeat until you find a bear that you want to go after that is in an approachable and recoverable spot.