Generally depends on water temperature. Down here near Wilmington they're close to being on the beds right now. Another week or two and they'll be full on spawning. Had we not had those cold fronts come through they'd be spawning already. In the Piedmont it's usually closer to mid or even late March before they move up on the beds. Farther up north they spawn into May. So there's really no short answer. I usually start looking shallow when the water temp breaks the 60 degree mark. If you fish every week it's pretty easy to figure it out because you'll catch them staging for a few weeks then you'll notice you're getting fewer and fewer bites at the depth you've been catching them in. So... depending on your location you may want to start thinking shallow in the coming days, or it may be a while longer.

Brian - Wilmington, NC