How often can I color my hair? July 09, 2020 12:25 Updated We recommend you wait at least two weeks between permanent hair color applications. Related articles How long does the permanent hair color last opened and unopened? What happens if I leave in Madison Reed hair color for too long? Should I wash my hair before coloring? When do I start timing my processing time? My hair is pretty damaged, can I still use Madison Reed hair color? Comments 0 comments Article is closed for comments.