Hey Rayman:
Here in southwest central Arkansas as soon as the water temps start to cool off in September the crappie start to move up from their deep summer locations and start biting better.
When the surface temps get down into the mid 60s and fall through the the 50s they get more aggresive and make a lot harder and longer runs - we've had several white crappie jump right out of the water here in the last couple weeks.