Coach Armstrong, who spent two seasons leading the Raiders, met with his coaching staff and players Friday morning to inform them of this decision.
He will continue to be a professional staff member at North Forsyth High School.
The Raiders were 4-16 under Armstrong, who took over North Forsyth after coaching at Banks County 2007-10. The Raiders were 3-7 in 2012. Armstrong also coached at Johnson High and Peachtree Ridge, leading the Lions to a share of the 2006 Class AAAAA title.
Armstrong's is the second football resignation this week for area schools after Habersham Central's Stuart Cunningham also stepped down on Wednesday.
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