Where The Six-Week Rule Came From
Hair grows at roughly a centimetre a month, and six weeks is about when a short, structured cut visibly loses its shape. That is the entire basis of the rule. It was never a statement about hair health, and it does not describe long hair, growing-out hair, or textured hair at all well.
If You're Growing It Out
You still need a trim — just a smaller one. A light dust every ten to twelve weeks removes split ends before they travel up the hair shaft, without sacrificing the length you're working toward.
Skipping trims entirely while growing hair out is the most common mistake we see, and it is self-defeating. A split travels upward until something stops it, and by the time it is obvious the damage sits well above where a small trim would have caught it. People who trim lightly and regularly reach their target length sooner than people who avoid the salon for a year.
If You Have a Precision Style
Blunt bobs, sharp fringes and structured layers rely on a clean line to look intentional. These benefit from a visit every four to six weeks — the shorter the style, the faster it visibly grows out of shape.
A fringe is its own schedule entirely. Most need attention every two to three weeks, and many salons, ours included, will trim one between appointments at no charge. It takes five minutes and it is the difference between a style that looks deliberate and one that looks neglected.
If Your Hair Is Chemically Treated
Colour-treated or keratin-smoothened hair is more prone to breakage at the ends. A regular trim schedule of six to eight weeks protects your investment in the colour or treatment itself, not just the shape.
There is a practical benefit too: damaged, porous ends hold colour badly and fade fastest. Removing them before a colour appointment produces a noticeably more even result and makes it last longer, which is why your colourist may suggest a trim first even when you came in only for colour.
If Your Hair Is Curly Or Coily
Curly hair hides length loss and shows shape loss, which reverses the usual signals. Twelve weeks is a reasonable interval for most curl patterns, and the cut matters more than the frequency — dry cutting, curl by curl, produces a shape that grows out evenly rather than one that needs correcting at the next visit.
If You Have Fine Or Thinning Hair
Ends thin faster than the rest, so a slightly shorter interval of eight weeks tends to keep the perimeter looking denser. Counter-intuitively, taking a little length off regularly makes fine hair look thicker than growing it long and letting the ends taper away to nothing.
The Real Rule of Thumb
Trust your ends, not the calendar. If they look healthy, glide smoothly, and hold your style, you can stretch your visit. If you're seeing dryness, splitting or a shape that's lost its structure, it's time — regardless of how many weeks it's been.
The most reliable signal is how long your hair takes to style. When a cut is working, it falls into shape with very little effort. When you find yourself spending an extra ten minutes each morning fighting it, the cut has grown out, whatever the calendar says. That is usually two to three weeks before you would otherwise have noticed.
Book The Next One Before You Leave
The practical reason is availability: the artist you want on the Saturday you want is booked several weeks ahead, and deciding on the day you finally notice your ends is the reliable way to wait another month. Booking before you leave costs nothing and is trivially easy to move.
The better reason is that a schedule keeps hair in a maintained state rather than a recovery one. Hair that is trimmed regularly needs a little taken off each time. Hair left until it visibly needs the salon needs considerably more removed to get back to a good shape, which is how people end up losing length they were trying to keep.