How to Do the Long-Tail Cast On

This page is the deep-dive companion to our How to Cast On page — same foundation stitch, taken slowly and in full, because it repays the attention. The long-tail cast on makes a firm, elastic edge with a neat row of little Vs, and it’s the cast on our cricket vest’s how-to pages teach in plain English and the one our beginner knit packs walk through step by step in their stitch schools.

Step by step

Measure out your tail before anything else: a good rule is roughly 10 cm of tail for every 10 stitches, and err generous — running out of tail at stitch 48 of 50 is a small heartbreak you only need once. Wrap-based measures work too: about ten wraps of yarn around the needle per ten stitches, plus a hand-span for luck.
Make a slip knot at the measured point and pop it onto your needle. The yarn on the needle side of the knot is your tail; the yarn running back to the ball is your working yarn, and the two must never swap jobs.
Hold the needle in your right hand and make the “slingshot” with your left: the tail drapes over your left thumb and the ball yarn over your left forefinger, with both ends pinched against your palm by your other fingers. It feels like a party trick for the first ten stitches and like second nature by the fiftieth.
Dip the needle tip up into the loop sitting around your thumb, coming from underneath it.
Swing the needle across to catch the yarn resting over your forefinger, scooping it from above so you grab a loop of the ball yarn.
Draw that loop back down through the thumb loop, the way you came in.
Slip the loop off your thumb and give the tail a gentle tug to settle the new stitch onto the needle — snug, not strangled. That’s one cast-on stitch (and your slip knot was the first, so count it too).
Repeat the rhythm — under the thumb loop, catch the finger yarn, back through, off, settle — one smooth scoop per stitch. The movement is quicker than the description, and you’ll find your hands learn it faster than your head does.
Count before you start row 1, and remember the edge’s one quirk: a long-tail cast on already looks like a row of knitting, because it is one — your pattern’s row 1 is worked straight into it, usually from the wrong side. If the edge fights you and feels tight, cast on over two needles held together next time and slip one out before row 1.

Patterns that use it

Cricket Test Vest and Baggy Green Beanie Knitting Pattern | Cable Knit Vest PDF, Green & Gold, Aussie, Digital Download

Beginner Craft-Night Knit Pack Vol 1 | 12 Easy Knitted Christmas Patterns PDF

Beginner Craft-Night Knit Pack Vol 2 | 12 Easy Aussie Christmas Patterns PDF

Beginner Craft-Night Knit Pack Vol 3 | 12 Easy Ornament & Bauble Patterns PDF

The catalogue copy supports 4 genuine matches — the cricket vest’s how-to pages and the stitch schools in all three Beginner Craft-Night knit packs each teach the long-tail cast on by name.

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Common mistakes

Measuring the tail too short and running out a few stitches from the end. There’s no rescuing it — the whole cast on has to come out and start again — so always err generous, and add a hand-span for luck on a big count.
Forgetting that the slip knot is your first stitch. You end up one stitch short at the end of row 1 and hunt for a mistake that isn’t there; count the knot in from the very start.
Pulling each stitch strangled-tight as you settle it. A tight cast on makes the first row a wrestling match and an edge that won’t stretch; settle each stitch snug, not strangled, and cast on over two needles held together if your edges always fight you.

Tina’s tips

Your tail goes over your thumb and the ball yarn over your forefinger, and the two must never swap jobs. If you find the ball yarn over your thumb mid-row, stop and sort it out — a swapped cast on shows as a messy, uneven edge.
For a big cast on, I pop a stitch marker or a scrap of contrasting yarn onto the needle every 20 stitches as I go. Counting to 120 in twenties is quicker, and if the count’s wrong you find out in the first minute, not the last.