AllMusic awarded the album 4 stars and in its review by Thom Jurek, stated "Day Is Done is another exceptional chapter in the Mehldau catalog, one that showcases a willingness to stretch itself to the breaking point and open up the band to a wider array of approaches".

[1] The Guardian's John Fordham gave it a 4 star rating and observed "Devoted fans need not panic: this album has the characteristic absentmindedly drifting, cannily misleading intros, the gathering clamour of melodies and countermelodies and the irresistible blend of song shapes, ambiance and impressionism.

[6] On the same site John Kelman noted "Day is Done is both a logical progression and a radical shift for Mehldau, and evident indication that it's possible—and maybe even important—to mess with success".

[7] JazzTimes reviewer, David R. Adler noted "Brad Mehldau's first trio recording for Nonesuch is also his first without Jorge Rossy at the drums.

Jeff Ballard, Rossy's replacement, is far from a stranger to Mehldau and bassist Larry Grenadier, and it isn't surprising that a drummer this brilliant should take to the trio like a fish to water.