The contest will be made up in a day-night doubleheader on Saturday, with the first game beginning at 12:10 p.m. and the second at 6:10 p.m.
Livan Hernandez and six-game winner Ubaldo Jimenez will face each other in the first game, followed by Luis Atilano and Jason Hammel later that night. Hammel will have to be activated before the game. He has been on the disabled list since April 27 with a strained right groin.
To make room for Hammel, the Rockies will officially place infielder Eric Young Jr. on the disabled list with a stress fracture in his right tibia.
The teams endured two separate weather delays in Washington's 14-6 rain-shortened win Thursday night. The game started 37 minutes later than scheduled as a storm cell passed through the area. The contest was halted for 40 minutes after the completion of the eighth inning, before the umpires finally decided to call it.
Nationals manager Jim Riggleman is glad both sides don't have to wait out any delays Friday night.
"We're here, you're kind of ready to play and all that. But it's great that they called it early instead of taking some chances, getting some people warmed up, playing intermittently," Riggleman said. "It's a good decision."