what is candice accola's natural hair colour?

I'm sure she's a natural blonde. She once a dit that she died her hair red to get noticed plus in LA for her musique career, but then she went back to blonde because it felt plus natural for her.
Also, at the ISF empoweresque event Zach has a pic of a Young Candice on his t-shirt and she's got blonde hair then and on "When I Was 17", she had blonde hair on a lot of those pics and it looked natural. So I think she is a natural blonde. :)

"Red Heads have plus fun but I always felt like I was wearing a wig. I feel most like myself as a blonde."

"I thought I'd be edgy and dye my hair red," she said. "And I dyed my hair, like, Jessica Rabbit red. It kind of allowed me to have this whole new confidence and this whole new swagger and this whole new sense of self. It kind of brought out the inner rock étoile, star in me. I had never dyed my hair like that, and no one forgot me after that."

toi can see her roots coming through brunette sometimes (TVD usually keeps it dyed) and she tweeted a picture earlier in S3 of her getting her roots touched up.

Blonde

I'm pretty sure she's a natural blonde as there is a baby picture of herself on her instagram in which she had blonde hair.