Normally there are certain time periods for a mass wave of minor league promotions. There's the pre-season, where players start at new levels. The next wave comes around the middle of June, which is the half way point for the five month minor league season. There can be individual promotions here and there surrounding that period, but you don't see those chain reaction moves where everyone is shifting up a level until mid-season. After that, the only other mass-wave period for promotions is at the end of the year with the minor league playoffs.

The Pirates currently have four teams in line for the playoffs with two weeks left in the minor league season. That doesn't include the DSL Pirates2 team, since you don't see many promotions from the DSL to the GCL in-season, due to travel issues...

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