Guster's On The Ocean takes place August 8-10, 2025 in Portland, Maine, featuring headliners Guster, The Mountain Goats, and HANSON alongside artists like Fruit Bats, Maggie Rose, and Joy Oladokun. This rock and folk festival showcases 10 artists across genres including folk rock, alternative, and acousmatic music. The three-day event presents an intimate lineup of established and emerging acts, with all performers hailing from the United States. Attendees can expect a diverse mix of acoustic-driven performances and alternative rock sounds throughout the weekend.