Some people do the Tampa Bay Marathon Swim as a “warm-up” for one of the triple crown swims. And it makes sense: Tampa is early in the season, 8 weeks before MIMS and more than 3 months before high season for channel crossings.
But thinking of Tampa as a “warm-up” might tempt a person to take it less seriously – and that would be a big mistake. TBMS is one of only four annual organized ultra-marathon (25K or longer) swim races in the U.S. (along with MIMS, Ederle, and Swim Across the Sound), and it may be the toughest. While water temperature is not usually a factor, pretty much everything else is. Glancing through the archives, tide changes and rough seas seem to be the two big ones.
Swimmers typically start with the flood tide, which pushes them up Tampa Bay — for a while. If you don’t swim far enough over the next few hours, though, the tide reverses direction and starts to push you back towards St. Petersburg – making it effectively impossible to finish.
Tampa Bay is also quite large, so conditions can mimic those in the open ocean. …