Get ready to strip down for a cause at Cupid's Undie Run - Boston, a "brief" fun-run that combines philanthropy with an unforgettable party atmosphere. Scheduled for February 21, 2026, in Boston, MA, this unique event challenges participants to brave the brisk New England air in their underwear—or creative costumes—for a mile-ish dash through the historic Fenway neighborhood. Starting and finishing at the lively Lansdowne Pub, the day kicks off with a pre-race party before the jaunt, culminating in an epic post-run celebration.

This isn't just any race; it's a nationwide movement with a massive heart, dedicated to raising awareness and crucial funds for the Children's Tumor Foundation in their fight against Neurofibromatosis (NF). NF is a group of genetic conditions that cause tumors to grow on nerves throughout the body, and every step taken helps fund vital research towards a cure. Boston's run holds a special place, famously offering runners the chance to run *through* iconic Fenway Park, providing a truly unique backdrop for this spirited event. Typical race day conditions in late February see highs around 40F and lows around 26F, with a 15% chance of precipitation, promising a truly memorable (and chilly!) experience for a fantastic cause.

Runners consistently praise Cupid's Undie Run for its electric energy, welcoming community, and the sheer joy of running pants-less for a purpose. It's an opportunity to embrace the ridiculous, connect with fellow "cherubs," and make a tangible difference in the lives of those affected by NF. Whether you're a seasoned runner or just looking for a fun way to give back, this event promises good times, great company, and the satisfaction of knowing your chilly cheeks are helping to #EndNF.