There's no single "Grafton High School" in Virginia. There are several high schools in the area of Grafton, Virginia, but they've had different names and opening dates depending on the specific school and any re-organizations over time. To answer your question accurately, I need more specifics. For example:
* Which county is it in? (York County, James City County, etc.)
* Is it a current school or a former school?
* Do you have any other details, such as the school's mascot or address?
With more information, I can try to find the founding date.