Jim Harvey's side took the lead in the 34th minute when Michael Brough headed Les Afful's corner home as Rovers went in search of only their fourth win of the campaign.
However, Vics equalised ten minutes into the second half when Felix Bastians, on loan from Nottingham Forest, slammed the ball home.
It looked as though the points would be shared until substitute Paul Stonehouse scored his first goal for Forest Green in the 72nd minute when he beat Northwich keeper Phil Senior after good work by Allan Russell.