Don’t Run Boston 50K & TARC 50M

The TARC Don't Run Boston is a "no-frills, no-fee" ultra-marathon scheduled for Sunday, April 19, 2026, at the Blue Hills Reservation in Milton, Massachusetts. Originally conceived in 1997 by Howie Breinan as a trail alternative to the Boston Marathon, the event has grown into a cornerstone of the New England ultra-running community. Participants can choose between a 50K and a 50-mile distance, both of which traverse rocky, technical, and intentionally unmarked trails. Navigational skill is considered a primary challenge of the event, with the course officially closing at 7:30 PM for all runners.

Milton is a suburban town in Norfolk County, Massachusetts, located about 10 miles south of Boston. The town has a population of approximately 28,600 residents. The demographic composition of Milton is roughly 69.1% White, 15.4% Black or African American, 5.6% Asian, and 4.2% Hispanic or Latino. The median annual household income is notably high at approximately $147,000. Geographically, the Blue Hills Reservation covers 7,000 acres and rises to a maximum elevation of 635 feet at Great Blue Hill. The terrain is famously rugged for the region, consisting of volcanic rock, steep granite outcroppings, and dense hardwood forests. In mid-April, local weather is notoriously variable, with average lows of 5°C (41°F) and highs of 14°C (57°F), though the park can experience anything from late-season snow to premature summer heat.

The event is organized by the Trail Animals Running Club (TARC), a nonprofit dedicated to equitable trail access. While the race is free to enter, participants are strongly encouraged to donate to the Mass Audubon Blue Hills Trailside Museum. The race is "Trail Sisters Approved" and a "Pride on Foot" partner, ensuring inclusive standards such as menstrual products at aid stations and a welcoming environment for non-binary and adaptive athletes. Registration is strictly managed; because the event is high-demand, TARC implements a donation-based penalty system for those who withdraw close to race day to ensure starting spots are utilized. All participants must adhere to a strict "Leave No Trace" policy to preserve the integrity of the state reservation's ecosystem.