Originally Posted by
halfspeed
The Munger trail is nice. I don't know about the others. You're better off planning no earlier than June to avoid unpredictable weather. There's usually some time in July when the heat and humidity cranks up to Texas levels. August is usually nice, too.
The Munger and Laveau trails between Duluth and Carlton are beautiful. The rest of the Munger is a bit tedious. I agree with MN Bike Tourer that the Hartland and Paul Bunyan are in general more scenic than the Munger.
The MNDot map leaves much to be desired, with a number of errors, at least for my part of the state (the northeast).