Killa Season received a mildly positive reception from music critics. Peter Relic of Rolling Stone found criticism in the album's production and soul samples and Cam'ron's insults towards Jay-Z but still found it entertaining with its wordplay, saying that "Killa Season proves Cam'ron can still bring heady verbiage and heat, but it's doubtful Jay-Z is losing much sleep." While also finding the production decent, Brian Sims of HipHopDX praised the album's skits and hooks and Cam's delivery for bringing light to creative imagery, saying that "As an industry veteran, Cam deserves a lot of credit for not using his album to address petty squabbles or provide some pseudo-intellectual autobiography." David Jeffries of AllMusic said that the album was in need of an editor to rework some tracks but still found it enjoyable with memorable hooks and for showing a vulnerable side in Cam, concluding with: "Killa Season would have benefited from trimming and better planning, but those things are extremely rare in the world of Dipset. Taking that into account, the album is exceptional and a good enough excuse for two more years of mouthing off and starting trouble. "