How to Cable Cast on (Knitting)

Cable cast-on uses two needles and produces a firm, rope-like edge — visibly corded, distinct from long-tail's smoother line. Unlike long-tail, it doesn't need a pre-measured tail at all, which makes it the practical choice any time stitches need to be added mid-project, not just at the very start of a piece.

Starting from nothing

Make a slipknot and place it on the left needle — this counts as your first stitch. Insert the right needle knitwise into that stitch, wrap the yarn as if to knit, and pull a new loop through, but instead of dropping the old stitch off (as you would in ordinary knitting), place the new loop onto the left needle. That's stitch two.

The repeat, once you have at least two stitches

1. Insert the right needle between the last two stitches on the left needle (not into a stitch, but into the gap between them).
2. Wrap the yarn as if to knit and pull a new loop through that gap.
3. Place the new loop onto the left needle, next to the stitch it came after.

Repeat step 1-3 for every additional stitch. Working into the gap between stitches, rather than into a stitch itself, is what distinguishes cable cast-on from a related method (knitted-on cast-on, which works into the last stitch instead) and is exactly what produces cable cast-on's firmer, corded edge.

Adding stitches mid-row

This is cable cast-on's real practical strength: because it needs no separate pre-measured tail, it's the standard method for adding stitches at the end of an existing row — a buttonhole, a sleeve gusset, extra width for a thumb opening. Work to the point where stitches need to be added, then work the cable cast-on repeat directly off the working needle rather than starting fresh, adding as many stitches as the pattern specifies before continuing the row.

Firmness compared to long-tail

Cable cast-on is noticeably less stretchy than long-tail — the corded structure that gives it visual definition also limits how much the edge can pull open. For a project where the cast-on edge needs real stretch — a ribbed cuff or brim relying on the edge to pull open — long-tail or a dedicated stretchy method usually suits better; for an edge that benefits from structure and doesn't need much give (a buttonhole, a firm edge before picking up stitches later), cable cast-on's firmness is an advantage rather than a limitation.

Where it goes wrong

The edge coming out too tight to work the first row. Cable cast-on tends toward tightness if the new loops are pulled snug against the needle rather than left with a small amount of ease — working the cast-on on a needle one size larger than the project's main needle, then switching down for the first row, is a common fix if tightness is a recurring problem.

Losing track of which gap to insert into. Easy to happen on a long cast-on with fast, repetitive motion — inserting into a stitch instead of the gap between stitches produces a visibly different, less corded edge partway through. If the texture changes partway across a cast-on, it's worth checking a few stitches back for exactly this mistake before continuing.

Confusing cable cast-on with knitted-on cast-on. The two look similar and are frequently taught together, but knitted-on inserts into the last stitch on the left needle (not the gap), producing a slightly looser, less-defined edge. If a pattern specifically calls for one and the finished edge doesn't match photos or description, check which of the two was actually worked.

Cable cast-on and knit versus purl setup rows

Cable cast-on is typically worked as if knitting throughout, regardless of whether the first row of the actual pattern is knit or purl — the cast-on itself doesn't need to match the stitch pattern that follows it, since it's establishing the foundation edge rather than the fabric's first row of pattern stitches.

Cable cast-on for buttonholes specifically

A one-row horizontal buttonhole is one of the most common places cable cast-on shows up mid-pattern: bind off the buttonhole's stitch count on one row, then on the return row, use cable cast-on to add the same number of stitches back over the gap. Because the new stitches are cast on directly onto the working needle rather than requiring a separate tail, the buttonhole opens and closes in the space of two rows with no extra finishing needed at the gap itself — a genuinely different, faster workflow than a two-row buttonhole method that binds off and picks the stitches back up separately.

FAQ

Is cable cast-on suitable for a project's very first stitches, or only for adding stitches mid-row? Both — cable cast-on works perfectly well as a project's original starting cast-on; it's simply also uniquely convenient for adding stitches later, which long-tail cannot do without restarting the whole cast-on with a new tail.

Does cable cast-on need a specific needle size different from the project's main needles? Not necessarily, though sizing up one needle for the cast-on row alone is a common fix if the resulting edge comes out tighter than the rest of the fabric — many patterns don't specify this, so it's worth judging by feel on your own swatch.

How does cable cast-on's corded edge look different from a standard bind-off edge? They're visually similar in that both have a rope-like, corded texture, which is part of why some patterns deliberately pair a cable cast-on with a matching bind-off method for a symmetrical top and bottom edge on a piece like a scarf.