If you mean the hard head or pop-eye mullet that folks eat the best time is in the fall around about the time of the Mullet Festival in Swansboro. If you are asking because you saw Wayne Pierce catching them on rod and reel, never seen anyone do that in these parts. They catch'em in cast nets. I caught 100's of pounds growing up and sold them to Bobby Provost at the Red Barn. Commercial operations use trawls and or gill nets.