The Basic Technique for Switching Yarn Colors
To change colors while knitting in the round, you work your last stitch in the old color, then pick up the new color and knit the next stitch with it. The key is where you make the switch: most knitters change colors at the beginning of a round, where a vertical seam naturally forms on the inside of the piece. This hides the color transition better than switching mid-round.
The actual handoff takes two steps. First, finish your last stitch completely in the old color—pull the yarn through both loops on your needle. Then, drop the old yarn and pick up the new yarn, leaving a tail about 4 to 6 inches long. Knit your next stitch normally with the new color. The old yarn tail and new yarn tail will sit side by side at that stitch, and you'll weave them in later.
If you're working with a pattern that requires color changes at specific points, mark those spots with a stitch marker before you start. This prevents you from accidentally switching colors one or two stitches early or late, which throws off the whole design.
Key Takeaways
- Change colors at the start of a round whenever possible, because the seam that forms there naturally hides the transition on the inside of your piece.
- Finish your last stitch in the old color completely, then pick up the new yarn and knit the next stitch with it, leaving a 4 to 6 inch tail on both yarns.
- Weave in both yarn tails after you finish the piece, working them through stitches on the inside to find them and prevent unraveling.
- Use stitch markers to flag the exact round where you need to switch colors, especially in patterns with multiple color changes.
Why the Seam Matters: Choosing Your Color-Change Spot
When you knit in the round on circular needles or double-pointed needles, your work forms a tube. The beginning of each round creates a vertical line where the last stitch of the previous round meets the first stitch of the new round. This line is already visible on the inside of your piece, so switching colors there doesn't create an extra visual break.
If you switch colors in the middle of a round, you'll see a horizontal stripe where the old color stops and the new color starts. That stripe runs across the entire width of your piece and is much harder to hide. For projects like hats, socks, or sweaters, a mid-round color change is usually noticeable and looks unfinished.
The exception is when your pattern specifically calls for a color change mid-round—for example, in a Fair Isle or jacquard design where colors alternate in a set pattern. In those cases, the design itself is meant to show the transitions, so you follow the pattern exactly.
Managing Yarn Tails at the Color Change
When you switch colors, you'll have two loose yarn tails at that stitch: the end of the old color and the beginning of the new color. Don't cut them short right away. Leave them 4 to 6 inches long so you have enough length to weave them in securely later.
Some knitters carry the old yarn loosely along the inside of the piece for a few stitches before cutting it, which can help anchor the tail. Others tie a loose knot between the two yarn tails to keep them from slipping. Either method works, but the knot must be loose enough that it doesn't create a bump in your finished piece. You'll undo it when you weave in the ends.
If you're switching between very different yarn weights or textures, the tails may be more visible. In that case, weave them in extra carefully, working them through the purl bumps on the inside of your stitches so they don't show through to the right side.
Stranding vs. Cutting: When to Keep Yarn Attached
Stranding means carrying the unused yarn color inside your piece as you knit, rather than cutting it. This works well if you're switching colors only a few times and the unused color won't be carried more than about 4 stitches at a time. Carry the yarn loosely on the inside—if you pull it tight, it will pucker your fabric.
If you're switching colors frequently or carrying yarn across many stitches, stranding becomes impractical. The loose yarn on the inside creates long floats (the strands of yarn running across the back), which can snag or stretch. In that case, cut the yarn and weave in the tails later. It takes more finishing work, but the piece will fit and wear better.
For most color-work patterns like stripes, cut the yarn at each color change. For patterns where you're using only two colors and switching back and forth, stranding is usually faster and creates fewer ends to weave in.
Preventing Holes and Loose Stitches at the Transition
A common problem at color changes is a loose stitch or a small hole where the colors meet. This happens when you don't pull the new yarn snug enough on the first stitch. The fix is straightforward: after you knit the first stitch with the new color, gently pull the new yarn tail to tighten that stitch. It should be the same tension as the stitches around it.
If you're stranding and switching back to a color you've used before, the transition is even more important. Pull the old yarn snug as you pick it up again, or you'll see a gap. Some knitters use a technique called catching floats, where they wrap the carried yarn around the working yarn every few stitches to anchor it and prevent loose spots.
Practice the tension on a swatch before you start your actual project. Knit a few rows in one color, switch colors, knit a few rows, and switch back. Look at the transition from both sides. If it's loose or gappy, you know to pull tighter on your next project.
Weaving in Ends After You Finish
Once your piece is complete, you'll have yarn tails at each color change. The standard method is to thread each tail onto a tapestry needle and weave it through the purl bumps on the inside of your stitches, working horizontally for about an inch. This anchors the tail so it won't unravel.
For tails at color changes, weave them in the direction of the round—horizontally along the inside—rather than vertically. This distributes the bulk of the tail and makes it less likely to show as a bump on the right side. After you've woven the tail in, you can trim it close to the fabric, leaving about a quarter inch so it doesn't slip back out.
If you have a lot of color changes, weaving in ends can take as long as knitting the piece itself. Some knitters prefer to strand whenever possible to reduce the number of tails. Others accept the extra finishing work as part of the craft. Either approach is fine—it's a matter of preference and the demands of your pattern.
Color Changes in Specific Stitch Patterns
If you're working a pattern that uses ribbing, garter stitch, or stockinette in the round, color changes work the same way: finish the last stitch in the old color, pick up the new color, and knit the next stitch. The stitch pattern itself doesn't change the technique.
In patterns that use both knit and purl stitches in the round—like brioche or fisherman's rib—pay attention to which stitch you're on when you switch colors. If you're supposed to purl the first stitch of the new round, purl it in the new color. The color change doesn't override the stitch pattern.
For colorwork patterns like Fair Isle or intarsia, follow your pattern chart exactly. The chart will show you which stitch to switch colors on. These patterns often require more careful tension management because the colors create a visual grid, and loose stitches or uneven tension will be obvious.
Frequently Asked Questions
Can I change colors in the middle of a round?
Yes, but the color transition will be visible as a horizontal line across your piece. Most knitters avoid this unless the pattern specifically calls for it. If you need a mid-round color change, mark the exact stitch with a stitch marker before you start so you don't accidentally switch early or late.
What if I run out of yarn and need to switch colors unexpectedly?
Finish the stitch you're on, cut the old yarn leaving a 4 to 6 inch tail, and pick up the new yarn. Knit the next stitch normally. You'll have a color change at that spot, which may or may not match your pattern. If it's noticeable and you don't want it there, you can frog (unravel) back to the beginning of the round and switch colors at the seam instead.
Do I need to tie the old and new yarn together?
No. A loose knot between the tails can help anchor them, but it's not required. Most knitters straightforward leave both tails loose and weave them in after the piece is finished. A knot must be very loose or it will create a bump in your fabric.
How do I prevent the new color from showing through to the right side?
Weave the yarn tails through the purl bumps on the inside of your stitches, working them horizontally along the inside of the piece. This keeps them on the wrong side and out of sight. If the yarn is very light or the fabric is thin, you may need to weave the tails in extra carefully or use a matching thread color.
What's the difference between stranding and cutting?
Stranding means carrying the unused yarn inside your piece as you knit. Cutting means snipping the yarn and weaving in the tail later. Strand when you're switching colors only a few times or carrying yarn across just a few stitches. Cut when you're switching frequently or carrying yarn across many stitches, because long floats on the inside can snag or stretch.