Summerfest 2025 Lineup Cards. So far, summerfest — returning to milwaukee's lakefront june 19 to 21, june 26 to 28 and july 3 to 5 — has revealed 20 acts for the 2025 fest. The festival drew 555,925 attendees in 2024, down from 624,407 in 2023.
The festival will be held on the following dates: Summerfest 2025 will take place over three weekends, spanning from late june to early july.