Castle just finished his 47th season as the head coach at Lakeland and all he did was lead them to a 14-0 record, 4S state crown and the No. 14 spot in the final MaxPreps Top 25. The Dreadnaughts beat Venice 21-14 to win the school's eighth state championship under his guidance along with titles in 1986, 1996, 1999, 2004, 2005, 2006 and 2018.
During the three-peat from 2004-06, Castle led Lakeland to a 45-0 record. The 2005 and 2006 teams are arguably among the greatest high school football teams of all-time.

Bill Castle talks to the media after a 31-30 overtime win over California powerhouse De La Salle in 2009. (Photo: Todd Shurtleff)
In 2005, Lakeland went 15-0 capped by a 39-10 win over St. Thomas Aquinas (Fort Lauderdale) in the Class 5A state championship. A year later, the Dreadnaughts ran the table again going 15-0. They beat St. Thomas Aquinas 45-42 in double overtime to repeat as champs in one of the
best high school football games of all-time.
Castle retires with a career record of 474-97 and is eighth all-time for most wins. Earlier this season he surpassed Charles "Corky" Rogers for the most wins in Florida history. Rogers retired with 471 wins as head coach. Castle spent 52 years coaching at Lakeland and never had a losing season during his 47 years as head coach.