The Slip Knot Method Closes the Join Before You Start
The gap that appears when you join to knit in the round happens because your first and last stitches sit slightly apart. The slip knot method prevents this by tightening the connection before you cast on. Instead of casting on all your stitches and then joining them, you cast on one stitch, then work your cast-on stitches around a circular needle or double-pointed needles until you reach that first stitch again.
To use this method: cast on your required number of stitches using your preferred cast-on (long-tail and cable cast-on both work well). Before you join, pull the working yarn snug so the last cast-on stitch sits close to the first one. Place a marker on your needle to mark the beginning of the round. When you knit the first stitch of the first round, you are knitting into the first stitch you cast on, which closes the circle when ready.
This method works because the tension you explore while casting on determines how tight the join will be. If you cast on loosely, the gap will be loose. If you cast on with firm, even tension, the join closes neatly.
Key Takeaways
- The gap appears because the first and last stitches of your cast-on row sit apart; tightening the yarn before you join closes it.
- Cast on with firm, even tension and pull the working yarn snug before placing your marker to prevent a loose join.
- The Judy's Magic Cast-On and the two-needle cast-on both create a seamless join because they build the circle as you cast on, rather than joining a flat row.
- If you have already cast on and the gap is visible, you can tighten it by working the first few stitches of the first round with slightly shorter loops.
- Blocking your finished piece will often close a small gap that remains after the first round.
Judy's Magic Cast-On Creates the Join as You Go
Judy's Magic Cast-On is a two-needle method that builds your stitches in a circle from the start, so there is no gap to close. You hold two needles parallel, cast on half your stitches on one needle and half on the other, then knit around both needles at once. Because the stitches are already arranged in a circle, the join is seamless.
This method takes longer to learn than a standard cast-on, but it eliminates the gap problem entirely. Many knitters find it worth the practice time because the join looks finished from the first round. Online video tutorials show the hand position clearly, which helps more than written steps alone.
Judy's Magic Cast-On works best for projects where you need an invisible join, such as the cuff of a sock or the crown of a hat. It is less practical for projects where the cast-on edge will be folded or hidden, because the extra setup time is wasted.
The Two-Needle Cast-On Builds a Closed Circle
The two-needle cast-on (also called the Emily Ocker cast-on or the Moebius cast-on in some contexts) uses two circular needles held together to create stitches that are already arranged in a round. You cast on using both needles as one, then separate them and knit around both needles in the first round.
This method is simpler to execute than Judy's Magic Cast-On and produces the same seamless result. The join is closed because your stitches form a circle during the cast-on itself, not after. The first round of knitting straightforward continues what the cast-on began.
The downside is that this method works best with circular needles or two sets of double-pointed needles, and the cast-on row can feel awkward to tension evenly. Practice on a small swatch first to get a feel for the hand position.
Tightening the First Round Closes a Visible Gap
If you have already cast on using a standard method and the gap is visible, you can reduce it by working the first few stitches of the first round with slightly tighter tension. Knit the first stitch, the second stitch, and sometimes the third stitch with a shorter loop than you normally would. This pulls the yarn tighter and draws the first and last cast-on stitches closer together.
This fix works best for small gaps. If the gap is large enough that you can see daylight through it, tightening the first few stitches alone will not close it completely. In that case, you may need to frog (unravel) back to the cast-on and start again with firmer tension.
After you finish the first round, the gap usually becomes less noticeable because the weight of the knitting pulls the join tight. Blocking your finished piece will often close any remaining gap, especially if you wet-block and allow the fabric to dry flat.
Cast-On Tension Matters More Than the Method
The most common reason for a gap is loose cast-on tension. If you cast on loosely, the join will be loose no matter which method you use. If you cast on with firm, even tension, most methods will produce a tight join.
To improve your cast-on tension: hold the working yarn with slightly more pressure between your fingers, and pull the yarn snug after you complete each stitch. Watch your cast-on stitches as you work — they should sit close together on the needle with no visible gaps between them. If you see gaps, your tension is too loose.
Practice casting on a few times before you begin your actual project. Muscle memory for tension develops quickly, and a few practice rounds will train your hands to cast on more consistently. Once your cast-on tension is firm, the gap problem usually disappears.
Double-Pointed Needles and Circular Needles Handle Joins Differently
The needle type you use affects how visible the gap is. Circular needles create a smoother join because the stitches are distributed evenly around the needle, and there is no "corner" where the join sits. Double-pointed needles create a visible corner at the join because the stitches are divided across four or five needles, and the join happens at the edge of one needle.
If you are using double-pointed needles and the gap bothers you, switching to a circular needle may help. The join will still be there, but it will be less noticeable because the stitches flow continuously around the needle rather than stopping and starting at needle edges.
If you must use double-pointed needles, pay extra attention to the tension at the join point. Pull the working yarn snug when you move from one needle to the next, especially when you knit the first stitch on a new needle. This prevents the loose stitches that make the gap visible.
Blocking Closes Small Gaps After You Finish
If a small gap remains after you bind off, blocking will often close it. Wet-blocking works best: soak your finished piece in cool water with a gentle wool wash, squeeze out the water gently, and lay it flat to dry. As the fabric dries, the weight of the wet yarn pulls the join tight, and the gap closes.
Blocking also evens out uneven tension in the cast-on row, which makes the join look more intentional. Even if the gap does not close completely, blocking will make it less noticeable by evening out the stitch size around the join.
For projects that cannot be wet-blocked (such as items with beads or embroidery), steam-blocking can help. Hold a steamer or iron set to steam a few inches above the join and let the steam relax the fibers. Do not press down with the iron, as this can flatten the stitches.
Frequently Asked Questions
Why does my join look like a hole?
A hole at the join usually means the cast-on stitches are too loose. The first and last stitches are sitting far apart, and the gap between them is visible. Tighten the first few stitches of the first round, or frog back and cast on again with firmer tension. Blocking after you finish will also help close the hole.
Does the gap go away after I knit more rounds?
A small gap usually becomes less noticeable after the first few rounds because the weight of the knitting pulls the join tight. A large gap will remain visible unless you tighten it during the first round or block it after you finish. Blocking is the most reliable way to close a gap that persists after knitting.
Can I use Judy's Magic Cast-On for any project?
Judy's Magic Cast-On works for any project that starts with a circular join, but it takes longer to execute than a standard cast-on. It is most worth learning for projects where the cast-on edge is visible and must look finished, such as socks and hats. For projects where the cast-on edge will be folded or hidden, a standard cast-on with firm tension is faster.
What if I am using a magic loop method?
The magic loop method uses one long circular needle to knit small circumferences. The join works the same way as with regular circular needles: cast on with firm tension, place a marker, and knit the first stitch into the first cast-on stitch. The gap is usually less noticeable with magic loop because the stitches are distributed evenly around the needle.
Should I use a different cast-on for knitting in the round?
No — most cast-on methods work equally well for knitting in the round as long as your tension is firm and even. Long-tail, cable, and provisional cast-ons all produce tight joins when executed with good tension. The method matters less than the tension you explore while casting on.