Sierra was born in Madison, Wisconsin. Her father was a journalist, so he moved around a lot. He met Aphrodite in California when he was doing an article on one of their famous beaches. Sierra was born when he was in Wisconsin for a article on one of their schools.
Sierra had a good life growing up, she was popular in school, as much as she hated it, and her dad moved around less when she was born. When she turned 13, there was a dracanae at her school. She had no ides how to get rid of it, and had no clue of her powers. She moved to a last resort when she yelled " Go Away!" Her charmspeak, a power she didn't know of had washed over the monster and it had disappeared. She then blacked out.
When she woke, she was at Camp Half Blood and has lived there ever since.