It's June 1st through November. I'm in the same boat so to speak. We have a cruise booked on Carnival at the end of August (which we got a GREAT price on), however, we too are nervous. I've read most hurricanes occur in August and Sept.
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Carnival Victory
Carnival Liberty
Going For Platinum! Carnival Spirit 3/2006, Carnival Valor 4/2005, Carnival Triumph 6/2003, Fantasy 8/2001, Tropicale 5/2000