Planning ahead

I just finished my third and last tri of my first season and am already thinking about next year.  I live in cold and snowy northern Ohio but would like to do an Olympic tri down south during the winter.  The problem is that with the snow that we usually get here from Dec-Feb is not conducive to long bike rides.  Is it realistic to sign up for a tri in Florida in March if most of my bike training will be on a trainer?  Also, I obviously won't be able to do any open water swims.  Will my open water experience from this year (with continued pool training over the winter) be enough to get me through a tri in that time frame?  Opinions and suggestions wanted.  Thanks.