Here is what you need to know:
Both races begin at South Lakes High School at 7:30 a.m.
The race starts and ends on the SLHS track and will utilize some Reston Association trails.
- South Lakes Drive
- Ridge Heights Road
- Sunrise Valley Drive
- Twin Branches Drive
- Soapstone Drive
- Lawyers Road
- Colts Neck Road
- Steeplechase Drive
Note: There are already signs warning there is no parking on Ridge Heights from Sunday at 1 a.m. to Sunday at 1 p.m. You could be ticketed or towed.
Streets will not be completely closed, but lanes will be blocked and traffic could be slowed.
All roads will reopen by 1:30 p.m., race officials said.
For more race information, visit the Runners Marathon website.
Photo: Runners Marathon 2015/file photo