The Silver Line will remain closed on Tuesday, says Metro. All other lines will be operating.
The system will reopen at 5 a.m. Tuesday, and fares will be charged, Metro says. Riders rode free on Monday when Metro offered limited below-ground service for most of the day.
Trains are expected to run every 12 minutes Tuesday.
Metro was shut down from 11 p.m. Friday until Monday morning as a blizzard raged through the area. Service was restored to 79 of 91 stations by 4 p.m. Monday.