Lace up your greenest running shoes for the Marshfield St. Patrick's Day 5K, "America's Most Irish Road Race," on Saturday, March 14, 2026, in scenic Marshfield, MA. This highly anticipated 5K event draws approximately 4,000 participants to the South Shore for a festive celebration that combines spirited racing with community cheer. Runners can expect a flat and fast USATF-certified ocean course, offering an excellent opportunity for a personal best as it winds through the picturesque Brant Rock area, starting at 277 Ocean Street and finishing near The Jetty.

Participants are encouraged to don their best St. Patrick's Day attire, contributing to the lively atmosphere of this premier road race. Beyond the excitement of the course, top male and female finishers can compete for cash prizes, with an additional bonus for setting new course records (current records stand at 14:39 for men and 16:13 for women). Age group awards are also presented for the top three in each category. Typical race day conditions in mid-March include highs around 46°F and lows near 27°F, with a modest 13% chance of precipitation, making for invigorating running weather.

The Marshfield St. Patrick's Day 5K is more than just a race; it's a cherished annual tradition that significantly benefits the Marshfield Education Foundation, having raised nearly a million dollars since its inception. The post-race festivities are a highlight, with vibrant finish parties hosted at the pubs and restaurants throughout Brant Rock, ensuring a memorable and fun conclusion for all "runners, walkers and crawlers".