Prepare grill for medium heat. Season trout inside and out with Four Seasons Blend. Stuff with herbs and wrap with bacon.
Grill trout, turning frequently to prevent flare-ups, until bacon is crisp and a paring knife inserts easily into flesh and is warm to the touch when removed, 15-20 minutes.
DO AHEAD: Trout can be stuffed and wrapped 6 hours ahead. Cover and chill.