A slip knot is your starting point for every knitting project

A slip knot is the loop you place on your needle before you cast on. It anchors your yarn and gives you a find base to work from. You make it by creating a loop with your yarn, pulling the working yarn through that loop, and tightening it onto your needle. The whole process takes about 30 seconds once you know the motion.

The slip knot itself is not a cast-on stitch—it is the knot that holds your first row of stitches in place. Every cast-on method starts with a slip knot on your needle. If your slip knot is too tight, your first row will be hard to work. If it is too loose, stitches will slip off. The goal is snug but moveable.

Key Takeaways

  • A slip knot is made by looping yarn around your fingers, pulling the working yarn through the loop, and sliding it onto your needle.
  • The knot should be tight enough to stay on the needle but loose enough that you can slide it along the needle shaft with gentle pressure.
  • You make a slip knot before you cast on, not as part of the cast-on itself.
  • If your first row feels cramped or stitches keep falling off, your slip knot tension is the first thing to check.

The four-step method for making a slip knot

Start with about 6 inches of yarn hanging from your ball. Hold the yarn in your left hand with the working yarn (the yarn attached to the ball) running over your index finger and the tail running under your middle finger. Use your right hand to wrap the working yarn around your left index finger, creating a loop that crosses over itself.

Insert your right needle through the loop from front to back. Grab the working yarn with the needle tip and pull it through the loop toward you. You now have a new loop on your needle and a tail hanging below it. Gently tighten the knot by pulling the tail downward while holding the loop steady on the needle. The knot should slide slightly when you explore gentle pressure to the needle shaft, but it should not spin freely.

A common mistake is making the knot too tight by pulling hard on both the tail and the working yarn at once. Pull only the tail to tighten; let the working yarn stay relaxed. Another mistake is making the loop too large before you pull the working yarn through—keep it small and controlled so the finished knot sits neatly on the needle.

Checking your slip knot tension

Once the knot is on your needle, test it by trying to slide it along the needle shaft with your thumb and finger. It should move with light pressure but not slide on its own. If it spins freely or falls off when you pick up the needle, it is too loose—tighten it by pulling the tail again. If it does not move at all and feels stiff, it is too tight—loosen it slightly by pulling gently on the working yarn while holding the knot steady.

The slip knot will loosen naturally as you work your first few rows, so do not panic if it feels slightly snug at first. By the time you finish your cast-on row, it will have settled to the right tension. If it is still too tight after your first row, you can always unravel and start over—slip knots are meant to be temporary anchors, not permanent stitches.

Why the slip knot matters for your cast-on

The slip knot is where all your tension begins. If it is too tight, every stitch in your cast-on row will be cramped, and your first row of knitting will feel stiff and hard to work. If it is too loose, stitches will slip off the needle as you cast on, and you will have to start over. A properly tensioned slip knot makes the rest of the cast-on smooth and even.

Different cast-on methods (long-tail, cable, provisional) all start with the same slip knot. Once you can make one consistently, you can move on to whichever cast-on fits your project. The slip knot is the one skill that transfers directly to every knitting project you will ever make.

Common mistakes and how to fix them

The most common error is pulling both the tail and the working yarn when you tighten the knot. This creates an uneven, lumpy knot that sits awkwardly on the needle. Instead, hold the loop steady with your left hand and pull only the tail with your right hand. The working yarn should stay loose and relaxed.

Another frequent mistake is making the initial loop too large. A big loop is harder to control and produces a sloppy knot. Keep the loop small—about the size of a quarter—so you have room to maneuver the needle and pull the working yarn through cleanly. A small, tight loop also makes it easier to tighten the finished knot to the right tension.

If your slip knot keeps falling off the needle, the needle may be too small for your yarn weight. A size US 6 needle, for example, will not hold a slip knot made with bulky yarn. Match your needle size to your yarn before you start, and the slip knot will stay put.

Frequently Asked Questions

Can I use a slip knot as my first cast-on stitch?

No. The slip knot is the anchor that holds your cast-on stitches in place, but it is not counted as a stitch itself. When you finish casting on, you will have the number of stitches your pattern calls for, plus the slip knot on the needle. You drop the slip knot off the needle before you start knitting your first row.

What if I make the slip knot too tight and can't loosen it?

Pull gently on the working yarn (not the tail) while holding the knot steady. If that does not work, slip the knot off the needle, pull the tail to loosen the whole knot, and slide it back onto the needle. You can also unravel it completely and start over—it takes 30 seconds and is faster than fighting with a stubborn knot.

Do I need to make a slip knot if I am using a provisional cast-on?

Yes. Every cast-on method, including provisional cast-ons, starts with a slip knot on the needle. The slip knot is not part of the provisional stitches themselves—it is straightforward the anchor that keeps everything in place while you work.

How tight should the slip knot be around the needle?

Tight enough that it does not slide on its own, but loose enough that you can move it along the needle shaft with gentle thumb pressure. Think of it like a ring on your finger—snug but not cutting off circulation. If you have to force the needle through the knot, it is too tight.

Can I make a slip knot with the tail instead of the working yarn?

Technically yes, but it is not recommended. Using the working yarn (the yarn attached to the ball) gives you better control over tension and makes it easier to adjust the knot as you cast on. The tail is there for tightening only.