With all the water we've gotten in the last few months, it's kept our temps lower. Right now we're at 64-66° depending on where your at on a lake. So they'd still be spawning here. I'd go catch them if the corps would allow a boat on the waters.
They hit the feedbag right after ice out, and they're usually spawning within a couple weeks after that. Where I'm at (SD), that means they start spawning around mid-April. How long they spawn? I'm not sure. I'd think that they'd normally be done by now.