Sniegoski's work for younger readers includes the Billy Hooten: Owlboy series and the fantasy quartet OutCast, which he co-authored with Christopher Golden. OutCast is in development as a film at Universal. Sniegoski and Golden have also collaborated on the adult dark fantasy series The Menagerie, and multiple creator-owned comic book series, including The Sisterhood, which is being prepped for a feature film by InterMedia, and Talent, currently in development at Universal after a major bidding war.
As a comic book writer, Sniegoski's work includes Stupid, Stupid Rat Tails, a prequel miniseries to international hit Bone. Sniegoski has also written the Bone: Quest for the Spark novels. Sniegoski collaborated with Bone creator Jeff Smith on the prequel, making him the only writer Smith has ever asked to work on those characters. Sniegoski and Golden also wrote the graphic novel BPRD: Hollow Earth, a spinoff from Hellboy.