From the National Writing Project (http://www.nwp.org/cs/public/print/resource/3138)
Middle School and High School
Figment is a community where teens can share their writing, connect with other readers, and discover new stories and authors. Whatever teens are into, from sonnets to mysteries, from sci-fi stories to cell phone novels, they can find it here.
This site used to be Frodo's Notebook, a quarterly magazine that invited teens to submit work. As of this posting, the site is not accepting submissions but promises to do so in the near future.
This site accepts art, poems, stories, personal narratives, college admission essays, and reviews of favorite (and least favorite) movies, books, colleges, and websites for their monthly print and online magazine. For more, see NWP's Spotlight on Teen Ink: A Magazine Written by and for Teens.
For students in grades K–12, KidLit welcomes a poem, a book review, or a short story, sent by email. Previous submissions may be read on the site.