First half (Apetura) ran from mid August to December. Second half (Clausura) is Feb to Jun.
Would you say the Apetura part is good? Probably gunna be in Buenos Aires for some of that period would love to get to a match
Lucky lad. Ridiculously good city, possibly my favourite . The leagues run separately so they're more or less equal aside from all the relegation only gets confirmed at the end of both (and over a cumulative 3 season period points ave - complicated). Not that it would matter, I went to 3 games over there and the dead rubber one was the best game atmosphere wise. All but a handful of teams play in BA so should you be there for a few days you'd easily be able to get yourself to a game or three. If you're lucky you might coincide with a classico.
If you've a day or two spare get the ferry to Colonia in Uruguay. Absolutey gorgeous little place.