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The 19th Annual Marathon Sports "Lets Run, Have Some Fun & Be Fit" Series is a 5Km race summer series that takes place on Thursday nights around the Charles River.

2018 Registration coming soon!

new in 2017: B-Tag Chip Timing

May 17, 2018

June 28, 2018

July 26, 2018

August 30, 2018

September 13, 2018

All Races Start at American Legion Marsh Post #442, 5 Greenough Blvd, Cambridge, MA

For regular updates from the Race Director