Joni Mitchell at Newport received a score of 79 out of 100 on review aggregator Metacritic based on twelve critics' reviews, indicating "generally favorable reviews".[6]Uncut deemed it "fair to say that Mitchell rarely does the heavy lifting here. Her role onstage is a fluid one: muse-goddess, North Star, shredder, comic foil and sometimes singer. The playing by her fellow artists is stellar and the backing vocals, in particular, ooze class", while Classic Rock described it as an "album packed with absolute love and admiration that is moving and inspiring in the extreme".[6]
Reviewing the album for Exclaim!, Sam Boer called the album "a reminder of the way Mitchell lives, and the way her music compels us to live", writing that "the sheer variety of musicians on stage for this festival performance is reason enough" to listen to the album, whose arrangements "carry a necessarily improvisational energy". Boer concluded it is Mitchell's "victory lap".[8] Lee Zimmerman of American Songwriter found it "hard not to get caught up in the sentiment shared both on and off that festival stage" and summarized the album as "a remarkable recording" and one that "can easily be considered an album for the ages".[7]
Grayson Haver Currin of Pitchfork likened the album to "a selfie snapped from some overwhelming vista, where the faces of the subjects accidentally crowd out the actual sight they're there to behold", and wrote that "Carlile's approach to the songs borders on suffocation" as she is "constantly reminding the audience that she's here, that she's partially responsible for this". Currin nevertheless felt that it "does get one thing exactly right, a sometimes-neglected aspect of Mitchell's career: her humor or, more exactly, her laughter", as her wit has been "frequently overlooked".[9]
