Other adults at the school often have a lot of influence over students. Make sure that the counselors know that you want all students in your CS classes. Show them examples of your students’ assignments to show them that CS can be engaging. Help counselors and other teachers recognize that there are stereotypes that discourage students from pursuing CS. Dispel these stereotypes so that other adults encourage all students to try CS. Use this "Critical Listening Guide" (www.ncwit.org/criticallistening) to identify and address counter-productive diversity narratives like "Women need to learn to be more confident" and "Women are such great collaborators."
Example: "All students can take CS! It isn't just for 'nerds.' "
See this and related tips as a Tip Sheet: http://csteachingtips.org/tips-for-recruitment-in-HS