February 27, 2015 at 1:16 pm #196961
is_front_page() will return
- the main blog page is being displayed
- and the Settings->Reading->Front Page display is set to “Your latest posts”
- when Settings->Reading->Front Page is set to “A static page” and the “Front Page” value is the current Page being displayed.
You can find more information including the description here: http://codex.wordpress.org/Function_Reference/is_front_page
Hope that helps,