Davis Square erupted with green and white on March 10 as over 5,000 racers competed in Somerville’s Ras na hEireann U.S.A., or “The Race of Ireland and U.S.A.” Participants, high on luck and cheer, raced in the 5K before celebrating in many of Somerville’s Irish pubs.

Racers lined up at the start line, seconds away from beginning the race.

Elizabeth Miner (left) and Jessica Kincman of Boston dressed up for the race. They said their motivation for participating in the race was “kicks and giggles” and that they were excited for the medal at the end.

Matthew O’Dowd, 7 months, sported an Irish bib for the race. His mother, Melissa, said this was his second race, with the Jingle Bell Run this past December being his first.

The Campbell Highlanders played the pipes and drums while runners registered for the race.

Shawn Gillespie (left) and Caroline Palma were veteran racers. “We run for fun,” Gillespie said. “We run for fun and beer!”

Mac supported his racing owner Dennis Buckley of Marlborough by getting into the Irish spirit.

Jesica Kirrane (left), Ed Kirrane, and Sara Fontaine said this was their first year competing in the Ras na hEireann. They said they had their own reasons for racing. “They’ve been working out all year,” Jesica said. “And I just want to drink!”

Cecilia Viggiano (left) and Laura Riegel said they’ve raced in the Jingle Bell Run twice, but that this was their first year racing for St. Patrick’s Day. “It sounded like fun,” Riegel said. “I love St. Patrick’s Day. It’s my favorite holiday.”

A flood of green and white filled Holland Street as over 5,000 racers started the course.

Glittery, green mustaches were a crowd-favorite accessory at the race.

Tutus, feather boas, and more drew the crowd’s attention as participants ran the race.

Eric Ashe was the first racer to cross the finish line. He finished in just under 15 minutes.

Participants received a commemorative medal upon crossing the finish line.

There was a mixture of emotions at the finish line, ranging from pure exhaustion to victorious hugs.

Post-race, participants made their way to local Irish pubs to let their cheer grow and the beer flow.