
From the Organizer
We’re proud to be partnering with Girls on the Run Greater Boston (GOTRGB) and bringing together a global community for our most exciting race to date. With over 500 in person runners and hundreds of virtual participants, we invite you all to join us in supporting an incredibly important cause.
Distances & Pricing
Race Location
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
Frequently Asked Questions (FAQs)
Trillium 2026 Spring 5K
May 16, 2026