Speaking of the Nationals, the Phillies won't get their first look at the Nats new park until May 19-21, if the road schedule, which is not confirmed, stands the way it is now. The Phillies will play their home opener against Washington on Monday March 31st. They'll play their annual "on deck" series March 28 and 29 against Toronto.
As for interleague play, the Phillies will have home series against the Toronto Blue Jays June 16-18 and then the Boston Red Sox and Los Angeles Angels come to Philly in mid-June. The Phillies will travel to Oakland and Texas immediately following those games.
What's the toughest part of the schedule? There is a tough stretch in June, when the Phillies go to Atlanta, have a "breather" in Florida, then head to St. Louis to wrap up a nine game, ten-day road trip. They then return home to take on Boston and the Angels. That's not the worst of things though. The Phillies head into the All-Star Break with a three game trip to Atlanta to start the month of July. From there, it's back home for games against the Mets (four games), St.Louis (three games) and N.L. West Champion Arizona (three games).
Technically, the Phillies make three west coast trips, heading to Arizona and San Francisco in May, Oakland in June and Los Angeles and San Diego in August. The Phillies have two ten-game homestands (May 26 to June 5 and July 4-13), which are their longest of the season. Their longest road trips are nine games and there are two of those (June 6-15 and August 28 to September 7).