Actually, it is not the set in stone schedule but it will give you an idea of what lies ahead when the Marlins start up again.
2009 Florida Marlins Tentative Spring Training Schedule.
If you click on the link you will notice there are no times listed, hence the word tentative.
But I imagine that the February 25 starting date is probably spot on.
Anyway, if are one of those people who like to plan in advance and going to Jupiter for the spring is you idea of fun (and why wouldn't it be) it will give you idea of what is to come.