In the short documentary "Open Windows" Harmer said he only wears black, blue and brown for concerts, cutting long sleeve shirts down to three quarter length. His father, George Harmer, is a retired Lieutenant Colonel in the US Army and is a former controller for Gensco, Inc, a Tacoma, Washington wholesale firm. His mother, Sheryl Harmer, recently resigned as a director with the nonprofit organization Committee for Children, based in Seattle, Washington. Nick has one brother named Andrew who was married in May 2008.
In December 2009 Harmer announced via his Twitter account that he is engaged.