It's the turn of redheads since “cinnamon brown hair colour” is leading the search trends. While we love redhead hair colour all year round, it really comes into its own in summer and autumn when the light literally hits different. What is burnt cinnamon hair colour? Instagram contentWhy is cinnamon brown hair colour trending? Cinnamon brown hair is the latest in a stream of redhead shades to take the spotlight, as red hair, in general, gets the love it deserves.