Thanks to L-Space for this. I’ve been referring to it a lot as my husband is reading his way through the whole thing. Click on the image if you need a larger version (that can be zoomed in) for easier reading. I would update this by putting I Shall Wear Midnight after Wintersmith in the young adult series, and adding Snuff after Thud in the Watch series.
To all the Pratchett fans out there, you’re doing yourself a disservice if you’re skipping his young adult books. They’re just as well written as the adult stuff, the only real difference being younger protagonists. And the Nac Mac Feegle are in them, who are hilarious. If you aren’t familiar with the Nac Mac Feegle (I feel bad for you) I refer you to the Wikipedia article. Start with The Wee Free Men. This is also an excellent way to addict your children to Terry Pratchett <evil laugh>.