SC- in the Big Ten, I believe that all but Wisconsin have baseball. for further example, In the Pac-10 all but Oregon have baseball. by further example, Colorado has no baseball in the Big 12. all weather issues? quite likely, but also Title IX issues, costs, etc. baseball ain't a money maker.
On the March 1 thing for my 2cents- weather is certainly a factor, and its a factor in any sport except basketball, hockey and gymnastics. And I guess it is a factor in hockey since most schools in the south, west, southwest don't have hockey programs.
as pointed out above, maybe northern schools have a weather advantage in football at the outset of the season and summer practice.
Bottom line, to play the number of games in baseball that are played at the D-1 level and not start until March 1 strikes me as an impossibility. My son plays d-3 and they have a 40 game schedule that is tough enough. Add about 20 games to that, starting March 1, and you might as well forget about going to class.
Would the NCAA do something this ridiculous, perhaps. While they don't think this is a burden to baseball players, they think adding one more game to get the BCS right in football would be criminal. Go figure