From WMATA:
“On New Year’s Eve, fares will be free after 8 p.m. thanks to a partnership with Miller Light and Coors Light’s Free Rides Program, which will help revelers get home safely and responsibly. Faregates will be open from 8 p.m. to 2 a.m. and no SmarTrip card will be needed. Bus customers will not need to tap between those hours either.
Metrorail will also stay open until 2 a.m.
, an extra two hours of service.
Last train times vary by station — check the stations page and add two hours to the Sunday last train time). Customers can also take advantage of Metro’s 24-hour bus service in D.C.“