I usually start after memorial day sometimes sooner. As long as the water is stays in the mid-upper 60's at least during the night then I am night fishing until about October or so.I am planning on going Saturday night. The shad spawn is on as best I can tell. They were trying to get with my spinnerbait all last weekend and so were the bass.
Be sure to have a double willow spinnerbait the match the shad if you go during the daylight hours.