Marathon swim calendar updated for 2013Marathon swim calendar updated for 2013 20 December 2012 metaEvan MorrisonThe #1-ranked calendar of marathon swim races has been updated for 2013 dates (if available). U.S. Marathon Swim Calendar If I’ve missed anything, let me know in the comments. Related Share Leave a Reply Click here to cancel reply. Name Email (will not be published) Website Comment Notify me of follow-up comments by email. Notify me of new posts by email.