Unlike last year, Metro will open two hours early on the day of this year’s Marine Corps Marathon to accommodate runners and fans. (Toni L. Sandys/The Washington Post)

Runners participating in Sunday’s Marine Corps Marathon will have the option to use Metro to reach the starting line.

Metro will open at 6 a.m. Sunday — two hours earlier than usual — to accommodate the 30,000 people expected to travel to Arlington for the race, which officially starts at 7:45 a.m.

From 6 to 9 a.m., there will be extra Yellow line trains running between Huntington station and Mount Vernon Square. During that time, there will also be extra Blue line trains running from Franconia-Springfield station to Stadium-Armory. There will also be extra Blue line trains running after the race, from 11:15 a.m.  to 4:15 p.m.

The closest station to the starting line will be Pentagon. which will be exit-only until 8:30 a.m. Metro is advising runners, along with their support crews and cheer squads, to consider using Pentagon City station as an alternate exit point to avoid crowding.

Though the rest of the system will be open early, Arlington Cemetery station will stay closed on Sunday until 8:30 a.m.

The Marine Corps Marathon 10K race, scheduled to start at 7:55 a.m. Sunday, will also be Metro-accessible. The race starts on the Mall in front of the National Gallery of Art. The closest stations to the starting line for that race will be Archives and L’Enfant Plaza stations.

The Marine Corps Marathon will be the third time in the past month that an organization pays Metro to stay open for extended hours, under a new policy in which event organizers must put down a $100,000 deposit per hour of extra train service.