On Monday, September 9th, 2013, The John Carroll School Launches a Year of Celebration! A school's anniversary is a time for all constituents to celebrate! On September 9, 1964, the Archdiocese of Baltimore opened the first Catholic, coeducational high school in Harford County, and on September 9, 2013, the John Carroll community will come together to celebrate its Fiftieth Anniversary year. The 50th Mass, followed by Rededication, will begin at 10:30 a.m. in the Gymnasium. May God bless The John Carroll School community on this special occasion.