Founding members Adam Gardner, Ryan Miller, and Brian Rosenworcel began practice sessions while attending Tufts University and formed the band in 1991.

The members met during the freshman Wilderness Orientation program in August of that year, playing publicly together as a trio two months later at the Midnight Cafe coffee house set in the common area of the Lewis Hall dormitory.

Shortly after the release of Parachute, another artist calling himself Gus signed a deal with a major record company, forcing the band to rename itself Guster.

In 2009, Guster took part in a similar event with musician John Mayer called Mayercraft Carrier 2 aboard the Carnival Splendor.

[13] On July 26, 2011, Ryan Miller went onto turntable.fm to give live previews of tracks off of Guster's On The Ocean EP and listen to music with fans.

[16] The debut concert for Evermotion took place with the release of the Greenovate Boston 2014 Climate Action Plan Update with Mayor Marty Walsh as a statement of the band's support for environmental causes.

[17] In 2016, en route to play a show in Philadelphia, the group was stopped in Pittsburgh due to the January 2016 United States blizzard.

The group tweeted that they planned to play a short set on the North Side in front of a dumpster at the corner of Sampsonia Way and Veto Street at 2 p.m. Saturday.

[20] In 2020, the group embarked on an acoustic tour with Connor Ratliff from Upright Citizens Brigade that was ultimately cut short due to COVID-19.

Brian Rosenworcel, the band's percussionist (affectionately dubbed the Thunder God by fans), added to Guster's unique sound with a combination of bongos, cymbals, and other drums, playing live shows using only his bare hands.

At this time, Rosenworcel began introducing a more traditional drum kit into the stage and studio performances in an effort to move away from bare-hand percussion.

[30] Other examples include: "Under the Bridge" by the Red Hot Chili Peppers, "Total Eclipse of the Heart" by Bonnie Tyler, "In the Air Tonight" by Phil Collins, and "Firework" by Katy Perry.

For example, at the end of "Airport Song", people in the crowd throw ping-pong balls at the stage, in reference to the studio recording where the audio of a table tennis game can be heard in the background.

In 2019, during their third annual On the Ocean festival in Portland, Maine, the band advertised a free afterparty "headlined by the legendary EDM group, PIPPI".

Guster maintains a close relationship with its fans with regular studio updates and road journals on their website, guster.com, and signs autographs after shows.

Guster once maintained a rep (representative) program, through which fans received promotional materials for upcoming concerts and albums to sell.

Following the release of Ganging Up on the Sun, the band formed a new program called the Wrecking Machines, through which fans are able to receive posters for advertising nearby concerts.

[32] In 2004, Guster guitarist and vocalist Adam Gardner and his wife co-founded Reverb, an organization dedicated to assisting touring artists by making activities more environmentally sound.

Reverb greens artists' tours and the music business at large while raising awareness and support for the environment through an interactive eco-village.

Since its inception, Reverb has worked with (among others) Billie Eilish, Jack Johnson, Barenaked Ladies, Bonnie Raitt, John Mayer, Dave Matthews Band, and Guster.