The race was even more of a challenge because of their disabilities, but they don't let that get in the way.
Competing is one of 14-year-old Riley Gray's past times. Her dad, Tom Gray started signing her up for races when she was just 10-years-old.
"When the race is ending, and she's coming around the finish line, and she's just laughing and has an ear to ear grin," said Tom Gray.
But she is not your typical athlete, she was born with a disease that keeps her from speaking and moving.
"There's really no diagnosis as to what there is to do to fix it because she's the only person in the country who has it," said Gray.
So to compete she has a team, they're called Team Riley, and Jenni Marshall is a part of it.
"It feels really neat; it's nice to be able to be a part of her day, and that I'm out here not racing for myself, but for her," said Jenni Marshall.
Marshall helped pull the boat Riley was in with her dad for the 1,500-meter swim.
"I thought it was so neat, and so awesome to hear people cheering, and knowing it's for her, this whole day is for her," she said.
As does Natalie Ludwig. It's her second triathlon, she's deaf, as well as her cheerleader Stacy Weiss.
"It's a small group of having deaf women in tri-athletics, so I'm trying to be as supportive as I can," said Weiss.
Natalie says one challenge is knowing exactly where to go.
"For us we have to study the map, you have to study knowing where to go because we don't want to go the wrong way," Said Natalie Ludwig.
It's a reminder never to give up.