The 2026 MLB regular season's longest winning streak sits firmly in the 13-15 game range according to trader consensus, driven by the Boston Red Sox's franchise-tying 15-game run in July and the absence of any longer streaks through early September. With roughly three weeks remaining and most clubs focused on playoff positioning or elimination scenarios, the compressed schedule and typical late-season pitching adjustments limit opportunities for extended runs. The Dodgers' current seven-game streak represents the longest active mark, while historical data shows streaks of 16 or more games have occurred only sporadically in the expansion era. A late surge by a contender or surging team could still push into the 16-18 bracket, though the final weeks' travel demands and bullpen usage make that outcome unlikely.