My two high school English teacher friends:
"Hmm...I don't remember reading it in high school (though I did in college), and it's not part of our school's freshman or sophomore English curricula. I've not taught American Lit however (an option for students during Jr/Sr year here), and Bierce's work(s) could be part of the American Lit course -- or at least an option in the anthology. Every high school even in the county may have diffferent course offerings and literary selections, of course; I can only speak definitively about my school."
"Interesting question. Yes, I taught it in 9th grade English, but I don't think it was actually in the anthology. I can't remember for sure. I think the teacher who taught Am Lit used it sometimes too. I'm not teaching any survey courses online, so I don't know about those, but my AP Lit and AP Lang courses don't use it."