Beach Boy, I'm with you on the idea of waiting until the end of April vs March for northward travel. When I lived in Indiana, a few years back, March seemed to be the time for blizzards and those "I sure wish it weren't snowing again snowstorms!".
I won't mention the temp outside here right now, but I will mention that I had to cut the grass yesterday.
I called up one of my favorite campgrounds to see if I could get into the park this weekend, and the response was "no way!". They're jammed with license tags from snow (blizzard) country until mid-March.
Oh well, God bless 'em - we need their money!