Reference

The most recently opened high school in Cabarrus County Schools is Robinson High School. It was the first new high school in Cabarrus County in 35 years and opened its doors on August 27, 2007. This information is supported by the Wikipedia page on Hickory Ridge High School, which states that Hickory Ridge High School was the sixth high school in the Cabarrus County Schools system when it opened in 2007, implying that Robinson High School was the most recent addition before it. The search results also mention that Robinson High School is part of Cabarrus County Schools, confirming its status as the newest high school in the district.