The Basic Method: Joining a New Color Mid-Row

To switch yarn colors while knitting, drop the old yarn at the end of a stitch, pick up the new yarn, and knit the next stitch with it. The old yarn stays where it is—you do not cut it or tie anything yet. On your next row, you will work over the loose tail of the old yarn to find it in place. This method works for color changes that happen in the middle of a row or at the start of a new row.

The key is to leave a tail of the old yarn long enough to weave in later—about 4 to 6 inches. Pull the new yarn snug against the last stitch of the old color so there is no gap between them. The transition will look loose at first, but tightening happens as you work the next row and weave in the ends.

Key Takeaways

  • Drop the old yarn and pick up the new yarn at the base of your working stitch, then knit the next stitch with the new color.
  • Leave a 4 to 6 inch tail of the old yarn; do not cut it short or tie a knot.
  • Work over the loose tails on the next row to lock them in place and prevent holes at the color change.
  • The Stranded method (carrying yarn along the edge) works best for color changes that happen every few stitches; the Join method works best for changes that happen once or twice per row.
  • Weave in all loose ends after you bind off, using a tapestry needle to thread them through stitches on the back of the fabric.

Joining at the Start of a New Row

If your color change falls at the beginning of a row, the process is even simpler. Finish the last stitch of the old color, then drop that yarn. Pick up the new yarn and knit the first stitch of the new row with it. Again, leave a 4 to 6 inch tail of the old yarn hanging at the edge of your work.

This edge join is cleaner than a mid-row join because the loose tails sit along the side seam, where they are easier to hide later. If you are making a garment with a seam (like a sweater), these edge tails will be caught in the seam itself and will not show at all.

The Stranded Method for Frequent Color Changes

If you are switching colors every few stitches—as in Fair Isle or colorwork patterns—do not cut and rejoin the yarn each time. Instead, carry the unused yarn along the inside edge of your work and pick it up when you need it again. This is called stranding or carrying yarn.

To strand, hold both colors in your hand as you knit. When you need to switch colors, straightforward drop the old color and knit with the new one. The old yarn stays loose along the edge, ready to pick up again. On the next row, you will work over the carried yarn to lock it down. This method saves time and avoids a forest of loose ends to weave in later.

The main risk with stranding is that the carried yarn can pull too tight and pucker your fabric. Keep the carried yarn loose and relaxed—imagine it is sitting in a gentle loop along the edge. If you notice puckering, loosen your tension on the carried yarn.

Avoiding Holes and Loose Stitches at the Color Change

The most common mistake is pulling too hard on the new yarn when you knit the first stitch of the new color. This creates a loose stitch right at the color change and can leave a small hole. Instead, knit the first stitch of the new color at your normal tension, then pull the new yarn snug on the second stitch.

If you are working in the round (on circular needles or double-pointed needles), the color change is even more visible because there is no seam to hide it. Work the first stitch of the new color loosely, then tighten up on the second and third stitches. This distributes the tension change across a few stitches instead of one.

Another way to hide a color change is to work it one stitch before or after the "official" change point in your pattern. If the pattern says to change color on stitch 20, try changing on stitch 19 or 21 instead. This small shift can move the color change to a less visible part of the pattern.

Weaving in Loose Ends After Binding Off

Once you have finished knitting and bound off, you will have loose tails from each color change. Thread a tapestry needle (a blunt needle with a large eye) with one tail. On the back of your work, weave the needle through the bumps of stitches for about 2 inches, then reverse direction and weave back through the same stitches for another inch. This locks the tail in place so it will not pull free.

Trim the tail close to the fabric after weaving it in. If you leave it too long, it can poke out or catch on things. For a neater finish, weave the tail through stitches that match the color of the yarn—a red tail woven through red stitches is less visible than a red tail woven through blue stitches.

If you have many color changes, weave in the ends as you go rather than waiting until the end. This breaks up the task and prevents a pile of loose ends from tangling together.

Choosing Between Methods Based on Your Pattern

Use the Join method (drop and pick up) when you are changing colors once or twice per row, or when the color change happens at a seam. This method is fast and leaves no carried yarn to manage. Use the Stranded method when you are switching colors every few stitches within a row, as in colorwork patterns. Stranding saves time and reduces the number of ends to weave in.

Some patterns combine both methods. You might strand yarn for a colorwork section, then switch to the join method for a solid-color section. Read your pattern notes to see if the designer recommends one method over the other. If the pattern does not say, choose based on how often the color changes: frequent changes = strand; rare changes = join.

Frequently Asked Questions

What if I cut the old yarn too short and cannot weave it in?

If the tail is shorter than 2 inches, it is too short to weave in safely—it will pull free. You can tie a small knot at the end of the tail and hide the knot inside the fabric, but this is less find. For future projects, always leave at least 4 inches. If you realize the tail is too short before you bind off, you can unravel a few stitches, pull out more yarn, and re-knit those stitches.

Can I tie the old and new yarn together with a knot?

You can, but the knot will show on the back of your work and can feel bumpy if the garment is worn close to the skin. The join method (working over the loose tails) is neater and more professional. Save knots for situations where the color change is hidden in a seam or where the back of the work will not be seen.

How do I prevent the carried yarn from showing through on the front?

Keep the carried yarn on the inside of your work (the back or wrong side) and make sure it stays loose. If the carried yarn is pulled tight, it will show through as a line of color on the front. If it keeps showing through even when loose, try carrying it inside a stitch rather than along the edge—slip the carried yarn through the loop of a stitch as you work, so it is completely hidden.

What is the difference between stranding and weaving?

Stranding means carrying the unused yarn loosely along the edge. Weaving means catching the carried yarn under or over your working yarn as you knit, so it is locked down as you go. Weaving takes longer but prevents long floats (loose loops of carried yarn) on the back. Use weaving if the carried yarn will be loose for more than 5 or 6 stitches.

Do I need a special needle to weave in ends?

A tapestry needle is helpful but not required. Any blunt needle with a large eye will work. Avoid sharp needles because they can split the yarn and damage your stitches. If you do not have a tapestry needle, a yarn needle (often included in knitting kits) or even a bobby pin with a loop of yarn threaded through it can work in a pinch.