As soon as the ice is gone. It's feast or famine that early for me. I usually target smallmouth first, as they are a little more active in cold water. I won't even wet a line until I see signs of life on the graph. I start looking in deep water close to spawning areas. If it's windy, and I mark fish on or close to the bottom, I'll drift and drag a tube, football jig or drop shot through the areas I marked fish, if it's calm, I will dead stick a drop shot, often dropping to marks I see on the graph, or painstakingly slow fish a small finesse jig. If they are suspended over deep water, a light wacky jig if it's calm, or suspending jerkbait if there is a little wind gets the nod. If I just can't get the smallmouth to play, I pull up on the edges of large weed flats and toss lipless cranks, and jerkbaits around for what ever will chase them..........usually things with teeth, but often a bass or two. Or I go looking for panfish. I don't even bother with largemouth until the water gets into the high 40's, which usually is about a week or two after ice out in the back water area's if we have had steady warming weather and night time temps that don't keep falling well below freezing, and up to a month on the main lake. And even then that mid to upper 40's temps are hit and miss..........timing is everything. Once it gets to, and holds in the low 50's is when I can almost call my shots, and just keeps getting better from there.