The MLS secondary transfer window typically opens in July and closes in mid-August, though exact dates vary slightly from year to year. This window provides teams with a final opportunity to add reinforcements from outside MLS before the stretch run toward the playoffs.
The secondary window is often the busiest period for MLS transfers, as teams assess their rosters at the midpoint of the season and make targeted additions. Contending teams may add a final piece to their puzzle, while struggling teams might make wholesale changes. The window closing creates a natural deadline that can drive up prices and create urgency in negotiations. After the window closes, teams can only make roster changes through intra-MLS trades and waiver claims.