Want a stretchy, professional-looking edge?

If you’re learning to knit, the long tail cast on is one of the best methods to learn — and one of the most rewarding once it clicks!

It creates a clean, even, slightly stretchy edge that looks polished and professional from the very first stitch. Unlike some cast on methods that leave a stiff or uneven starting row, the long tail cast on gives your project a foundation that lies beautifully flat and holds its shape over time.

Best of all? Once your hands learn the rhythm, it goes surprisingly fast. Many knitters find it becomes their go-to cast on for almost everything.

Why Use the Long Tail Cast On?

This method gives you a smooth, even edge that looks great on both sides, a slightly stretchy foundation that’s perfect for anything that needs to fit over a hand, foot, or head, and a clean professional-looking start that experienced knitters immediately recognize. It’s one of the most commonly used cast on methods in all of knitting, called for in countless patterns from basic scarves to complex sweaters.

How It Compares to Other Cast Ons

vs. Knitted Cast On: The knitted cast on is simpler to learn but produces a looser, less defined edge. The long tail cast on creates a neater, more elastic edge with better stitch definition.

vs. Cable Cast On: Similar appearance to long tail, but the cable cast on is firmer and less stretchy. Long tail is the better choice for projects that need elasticity.

vs. Thumb Cast On: Very similar technique, but the thumb cast on uses only one strand. Long tail uses both strands simultaneously, which is what gives it that distinctive clean edge.

What You’ll Need

Your knitting needle (the size your pattern calls for)
Your yarn
A tape measure or ruler (helpful for measuring your tail!)

The Most Important Step Before You Begin — Measuring Your Tail

The long tail cast on uses two strands of yarn simultaneously — the working yarn connected to your ball, and a long “tail.” Both strands work together to form each stitch. The tail needs to be long enough to cast on ALL of your required stitches.

The Golden Rule: 1 inch of tail per stitch, plus 8 extra inches

Cast on 30 stitches → 30 + 8 = 38 inches of tail
Cast on 60 stitches → 60 + 8 = 68 inches of tail
Cast on 100 stitches → 100 + 8 = 108 inches of tail

When in doubt, always leave MORE tail than you think you need. A tail that is too long is no problem — a tail that is too short means starting over completely!

Understanding the Two Strands

Before you begin, take a moment to understand the role of each strand — this makes every step much easier to follow:

The Tail — the cut end, NOT connected to the ball. This goes over your thumb and forms the bottom edge of each cast on stitch.

The Working Yarn — the long end connected to your ball. This goes over your index finger and forms the top loop of each stitch.

Throughout the whole cast on, your thumb controls the tail and your index finger controls the working yarn. Once you internalize this, the hand movements start to make intuitive sense!

Step-by-Step: How to Long Tail Cast On

Step 1: Make a slip knot

Begin by making a slip knot and placing it on your needle. This slip knot counts as your first cast on stitch, so count it in your total!

You’ll now have two strands hanging from the needle — one connected to your yarn ball (working yarn) and one that’s the free tail end.

Need help with the slip knot? Check out the How to Make a Slip Knot tutorial here!

Step 2: Position your fingers

Hold the needle in your right hand. With your left hand, insert your thumb and index finger between the two strands of yarn, spreading them apart.

Tail strand goes over your left thumb
Working yarn goes over your left index finger

Use your remaining three fingers to wrap around both strands and hold them lightly against your palm.

Tip: Pin the slip knot gently against the needle with your right index finger while you get your left hand positioned. This stops it from sliding around while you find your grip!

Step 3: Hold the Yarn Securely

Wrap your remaining fingers (middle, ring, and pinky) around both strands to hold them together against your palm. You want just enough tension to keep the yarn taut — not so tight that it won’t move, and not so loose that the strands flop around. Think of it as a gentle but confident hold.

Step 4: Create the “V” Shape

Spread your thumb and index finger apart so the two strands form a clear “V” or slingshot shape between them. The strand around your thumb forms the left side of the V, and the strand around your index finger forms the right side.

This V shape is your working position — you’ll return to it before every single stitch throughout the entire cast on!

Step 5: Insert Your Needle Under the Thumb Strand

With the V shape open, bring your needle tip under the strand running along your thumb — entering from below and scooping upward. The strand should rest across the shaft of the needle, not just the tip.

Step 6: Lift the Strand Upward

Use your needle to lift that thumb strand upward, creating a loop. Keep the strand on the needle — don’t let it slide off. Your thumb is still inside this loop for now.

Angie’s Note: This step will feel the most awkward at first! Go slowly — this is the movement that takes the most practice to make smooth. Once it clicks, everything speeds up and the rhythm just flows!

Step 7: Reach Over to the Index Finger Strand

With the thumb loop still on your needle, swing the needle tip over and toward the strand on your index finger — sweeping it in a small arc. The thumb loop stays on the needle throughout this movement.

Step 8: Hook the Index Finger Strand

Catch the index finger strand (working yarn) with your needle tip from underneath — like a fishing hook grabbing a line. A clean, decisive catch from below!

Step 9: Pull Through the Thumb Loop

Pull that hooked strand back through the thumb loop — drawing it toward you and down through the arch you created in Step 6. This is the moment the new stitch is born!

Step 10: Release your thumb

Let your thumb slip out of the loop gently. The stitch is now fully formed and sitting on your needle.

Step 11: Tighten the stitch

Gently pull both strands — the tail and the working yarn — away from the needle to snug the new stitch into place. The goal is a stitch that sits snugly but still slides along the needle smoothly.

Perfect tension check: After tightening, try sliding the stitch along the needle. It should move freely with just a little resistance. If you have to force it, it’s too tight. If it flops loosely, snug it up a little more!

You Did It — One Stitch Cast On!

You’ve just cast on one stitch using the long tail method! Now re-form your V shape and repeat Steps 5 through 11 for every additional stitch your pattern requires. Count your stitches as you go — including that first slip knot — and you’re building your foundation row one beautiful stitch at a time.

Tips for a Beautiful Long Tail Cast On

Keep your tension consistent. Try to pull the yarn to the same snugness after every stitch. Uneven tension is the most common reason a long tail cast on looks lumpy.

Don’t hold the yarn too tightly. A death grip on the strands makes the stitches too tight. Relax your hand between stitches — the yarn just needs to be held, not strangled!

Count out loud as you go. It’s very easy to lose your place when you’re concentrating on the technique.

Practice on scrap yarn first. Even 10–15 practice stitches makes a huge difference before starting a real project.

Re-form the V before every stitch. This one habit creates consistent, even stitches throughout your entire cast on.

Troubleshooting Common Problems

My tail ran out before I finished casting on. The tail wasn’t long enough. Use the formula — number of stitches × 1 inch + 8 inches — and always add a few extra buffer inches. Unfortunately you’ll need to start over with a longer tail.

My stitches are too tight to knit into on the first row. Your tension during cast on was too tight. Try casting on more loosely. Some knitters cast on over two needles held together to ensure a looser result, then remove one needle before knitting.

My stitches look twisted. This means the needle went over the thumb strand instead of under it in Step 5. Make sure you’re scooping under the strand from below, not going over the top.

I keep losing the V shape. Slow down and re-establish the V between every stitch. Try wrapping the tail once more around your thumb before each stitch to keep it in place.

My cast on edge looks uneven. This is a tension consistency issue. Focus on pulling both strands to exactly the same snugness after every stitch. It improves quickly with practice!

Frequently Asked Questions

Does the slip knot count as a cast on stitch? Yes! The slip knot counts as your first stitch. So if your pattern says cast on 20 stitches, make your slip knot then cast on 19 more using the long tail method — giving you 20 total.

What if I’m casting on a very large number of stitches like 200 for a blanket? Leave a very generous tail! A handy shortcut: cast on 10 stitches and measure the tail used, then multiply by 20 for your full count. You can also use a separate ball of yarn as the “tail” for very large cast ons — just cut it after setup.

Can I use the long tail cast on for circular knitting? Absolutely! It works perfectly for knitting in the round. Cast on your stitches as normal, then join to work in the round according to your pattern.

My pattern says “cast on using your preferred method” — is long tail a good choice? Almost always yes! The long tail cast on is appropriate for the vast majority of knitting projects. The only exception is when a pattern specifically requires a provisional cast on or another specialty method.

Is there a way to do the long tail cast on without measuring the tail first? Yes! Use two separate balls of yarn — one as the “tail” and one as the working yarn. Simply cut the tail yarn when you’ve cast on enough stitches. This is especially useful for very large stitch counts where measuring a long tail is impractical.

How do I know if my cast on tension is right? Try sliding the stitches back and forth along the needle after casting on. They should move freely without resistance but not fall off on their own. On your first knitting row, if you can insert the needle comfortably into each stitch, your tension is perfect!

Congratulations on learning to long tail cast on! It took me a few tries before my hands caught on — so don’t get discouraged. You will get it! And once you do, you’ll always have this skill in your knitting bag.

Happy knitting,

~Angie

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How to Long Tail Cast On (Beginner Knitting Tutorial)