A point of hog trapping, told to me by Ft. Sill's Game warden Glen Wampler, was to trap continuously, year round. Even if your traps are no longer catching hogs, they're out there. He had traps on Ft. Sill that were visible from the road via binos. That way, his guys could check on the traps every day or two while not disturbing them except to put out bait.