Heartstrings Knit Socks - Free Stranded Colorwork Sock Pattern

If you’ve been craving a stranded colorwork sock pattern that actually lets you flex your skills, say hello to the Heartstrings Socks.

These DK weight socks were originally available only inside my Camp Colorwork course in the Marly Bird House. So many of you asked for more intermediate and advanced sock patterns that I decided it was time to bring Heartstrings out into the wild as a free pattern on MarlyBird.com.

A smiling woman with glasses holds a pink and purple Heartstrings knit sock pattern; next to her is a close-up of the sock on a white background with pink flowers. Text reads: "HEARTSTRINGS Stranded Knit Sock Pattern. -Marly Bird

You’ll also be able to grab an ad-free, printable PDF if you love keeping your sock patterns in a binder or on your tablet, but the full written pattern will be available here to knit from for free.

Heartstrings is all about romance, rhythm, and really satisfying colorwork. Inspired by the idea of regency love letters, the motifs echo hearts, flourishes, and that slow, thoughtful kind of love that shows up in rows and rows of tiny stitches.

Affiliate Disclosure: This post contains affiliate links. To learn more please visit my privacy policy here💖

A digital ad features the Heartstrings knit sock pattern PDF, showcasing floral designs, a sample sock, preview pages, and text: "Ad-Free PDF! BUY NOW." The background is burgundy. -Marly Bird

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ABOUT THE HEARTSTRINGS SOCKS

These are top-down, stranded colorwork socks knit in the round with a forethought (afterthought-style) heel and a wedge toe, written for three adult sizes.

The fabric is worked in stranded stockinette using DK weight yarn, which means:

The socks feel cozy and substantial on the foot.
The colorwork is easier to manage than it would be in tiny fingering weight.
You can really see and enjoy the motifs as you knit.

The pattern includes:

Three sizes: Small, Medium, Large
Clear instructions for the forethought heel
A stranded leg and foot, with a solid toe and heel
Designer tips built into the notes so you can adjust length and heel depth

Skill level: Intermediate
These are perfect if you’re comfortable with sock basics and ready to level up your colorwork.

Knitted sock in pink and burgundy with heart and diamond patterns, resting on a wooden tray beside a red candle.

WHAT YOU’LL LOVE ABOUT THESE SOCKS

Here’s why I think Heartstrings is going to land in your “knit these again” pile:

DK weight stranded colorwork: You get that classic colorwork look with fewer stitches per round and a cozier fabric.
Thoughtful motifs: Inspired by regency-style romance, these socks have heart-like shapes and ornamental rhythm without feeling too literal or cutesy.
Customizable options: With multiple colorwork motifs and three sizes, you can really make them your own.
Forethought heel: If you like clean lines and a great fit, this heel style is incredibly satisfying.
Technique builder: You’ll practice stranded knitting, color dominance, forethought heel construction, and toe grafting all in one project.

If you’ve been wanting to move beyond plain vanilla socks and really play with colorwork, Heartstrings is a fantastic next step.

PATTERN DETAILS AT A GLANCE

Skill Level
Intermediate

To Fit Sizes
Small, Medium, Large

Finished Measurements
Socks measure approximately 7 (8, 9) inches / 18 (20.5, 23) cm in circumference.
Sample shown is Large size.

Designer Tip:
The best way to choose your size is to measure the circumference around the ball of the foot. Choose the size closest to that measurement for a snug, comfortable fit.

Gauge
32 sts and 34 rounds = 4 inches / 10 cm in stranded stockinette stitch (two-color knitting).
28 sts and 42 rounds = 4 inches / 10 cm in stockinette stitch in one color.

Note: It’s best to match your gauge to the stranded stockinette gauge. If your one-color gauge varies slightly, that’s ok. Just make a note of it, because you’ll need that number when you customize the foot length.

Yarn
Destination Yarn Souvenir DK Weight
100% Superwash Merino Wool
231 yds / 211 m, 3.5 oz / 100 g, CYCA #3 light

Color A: Slow Burn Red – approximately 1.75 oz / 50 g
Color B: Friends to Lovers Peach – approximately 1.75 oz / 50 g
Color C: Envy Green – approximately 1.75 oz / 50 g

Needles
US 2 (2.75 mm) set of double-pointed needles, or size needed to obtain gauge.

Notions
Removable stitch markers
Scrap yarn (for the forethought heel) or Stitch Saver (I love this stuff!)
Tapestry needle

Abbreviations
Approx – approximately
Dec – decrease
K – knit
K2tog – knit two together
P – purl
RS – right side
Sl – slip
Ssk – slip, slip, knit (see Special Stitches)
St st – stockinette stitch (knit on RS and purl on WS)
St(s) – stitch(es)
WS – wrong side

Special Stitch
Ssk (Slip, Slip, Knit): Slip 2 stitches, one at a time, as if to knit. Insert left hand needle into the front of these two stitches and knit them together from this position (1 stitch decreased).

This is the introduction video to the Heartstrings Socks Module inside of Camp Colowork.

VIDEO SUPPORT FOR KEY TECHNIQUES

You can pair this pattern with some of my favorite technique videos:

Long Tail Cast On >> Click Here for Video Help <<

No Cuss Cast On >> Click Here for Video Help <<

Duplicate Stitch >> Click Here for Video Help <<

Weave in Floats >> Click Here for Video Help <<

Kitchener Stitch >> Click Here for Video Help <<

Bury Ends >> Click Here for Video Help <<

If you’d love someone (hi, it’s me 👋) to walk you through every step of these Heartstrings socks with video tutorials, you’re going to want to check out Camp Colorwork inside the Marly Bird House.

Camp Colorwork crochet and knitting course by Marly Bird and Robyn Chachula

STRANDED KNITTING TIPS FOR HEARTSTRINGS

These socks are all about stranded colorwork. Let’s talk about how to make that experience happy instead of stressful.

FLOAT TENSION

In stranded knitting, you’re carrying unused colors across the back of the work as floats. If you pull those floats too tight:

The sock shrinks in circumference.
The leg and foot feel tight or “hard.”
The fabric can pucker.

Tips for better floats:

Spread your stitches out on the right-hand needle as you carry the float so it has enough length.
Don’t yank the yarn when changing colors; let it rest.
Try the inside-out trick (next section) if small circumferences are giving you trouble.

KNITTING INSIDE OUT TO HELP YOUR FLOATS

Designer Tip: When working stranded colorwork on small circumferences, I like to knit the sock inside out for the leg and foot.

Here’s why it helps:

When the sock is inside out, the circumference you’re knitting around is slightly larger than the needle circle.
The floats travel around the outside curve of the tube, which naturally gives them a little more length.
It becomes physically harder to pull your floats too tight.

You still follow the chart exactly the same way. You’re just flipping the tube so the wrong side faces you while you work the colorwork section. When it’s time to knit the heel and toe, you turn the sock right side out again so it’s easier to see decreases and shaping.

A close-up of the inside view of stranded knit socks in pink, black, and burgundy yarn. Text reads “Stranded Knit Socks (inside view),” “HEARTSTRINGS knit sock pattern,” and “Marly Bird.”. -Marly Bird

COLOR DOMINANCE AND WHY IT MATTERS

In stranded knitting, one color will always appear a little more prominent. That’s called color dominance. The yarn that is held in the dominant position tends to pop forward visually.

General rule:

The yarn strand that travels the longer path behind the work (often the one held in your left hand for two-handed knitting) is the dominant color.

For Heartstrings, that means:

Decide which color is your motif color and which is your background color.
Keep the motif color in the dominant position for the entire sock.
Don’t switch which hand holds which yarn halfway through, or your motifs may start to look uneven.

If your motifs look “muddy,” check both your color contrast and your yarn dominance.

WEAVING IN FLOATS

These socks are knit in DK weight, so even slightly longer floats can be okay, especially in the leg. But if you’re not comfortable with long floats, you can weave them in.

Designer Tip from the pattern notes:
Weave the floats if one stretches over more than 5 stitches, if you’re not comfortable with longer floats on your socks.

GAUGE IN STRANDED COLORWORK

Your stranded gauge will almost always be tighter than your one-color gauge. That’s why the pattern gives two gauges and emphasizes the stranded one.

Best practice:

Knit your gauge swatch in the round, using stranded stockinette with two colors, in the same yarn you’ll use for the socks.
Block the swatch the same way you’ll block your finished socks.
Measure after blocking and adjust your needle size if needed.

If your one-color gauge is slightly different, that’s okay. Just note it for when you customize foot length.

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Various yarn skeins in vibrant colors are showcased against a white background with the text "Choose Colors for Colorwork." Perfect for your 2025 Edition colorwork project, the skeins are arranged by color, including pinks, blues, purples, and neutrals. -Marly Bird

CHOOSING COLORS FOR HEARTSTRINGS

Heartstrings is designed for three colors: A, B, and C.

Things to think about:

Contrast
Make sure your motif color has enough contrast with your background color. A medium or dark background with a lighter motif works beautifully, but high contrast is the real key.

Value
Try looking at your yarns in black and white (you can snap a quick phone photo and apply a grayscale filter). If they all turn into the same gray, they may blend together in the colorwork.

Mood
The original uses romantic, slightly moody tones to echo the regency love letter inspiration. You can go:

Classic: deep red, cream, and soft gold
Modern: charcoal, blush, and neon pop
Cozy: forest, heather gray, and plum

Most importantly: pick colors that make you happy every time you look at your feet. If you would like to read more about choosing colors, here is a great blog post for you.

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WHAT NEEDLES WORK BEST FOR SOCKS LIKE THIS?

The pattern is written for double-pointed needles (DPNs) in size US 2 (2.75 mm), but you can absolutely use your favorite sock-knitting method.

Options that work well:

Double-pointed needles – great control, easy to manage the colorwork in quarters.
Magic loop – one long circular needle, ideal if you don’t love juggling multiple needles.
Two circulars – good for knitters who like even distribution and easy transitions.

Whichever you choose:

Make sure you’re comfortable managing the stranded colorwork without laddering between needles.
Keep the round beginning location consistent, especially for the forethought heel placement.
If you switch methods partway through, double-check your stitch counts and markers.

The best needles are the ones you’re not fighting with.

ABOUT THE FORETHOUGHT HEEL

These socks use a forethought heel technique. You knit past where the heel will be, using waste yarn to “hold the place,” and then come back later to work the heel in that space.

Highlights:

It keeps the leg colorwork uninterrupted.
It’s easy to replace a worn-out heel later if needed.
You can tweak the heel depth by adding a few extra rounds before beginning the decreases.

Designer Tip from the notes:
To get a slightly larger heel diagonal measurement, add a few rounds of knitting to the heel before beginning the heel decreases. Add an extra 2 stitches for every extra round you add.

Camp Colorwork: Step-by-Step Help for Heartstrings

If you’d love someone (hi, it’s me 👋) to walk you through every step of these Heartstrings socks, you’re going to want to check out Camp Colorwork inside the Marly Bird House.

Heartstrings actually has its own dedicated module inside the course, so you’re not just getting a pattern—you’re getting a full, guided experience.

What You’ll Learn for the Heartstrings Socks

Inside Camp Colorwork, there is a module focused on these very socks, where I walk you through:

Casting on and setting up for top-down socks
Working stranded colorwork in the round (including the knit-it-inside-out trick for better floats)
Managing multiple colors and keeping your tension even
Understanding and using color dominance so your motifs really pop
Placing and working the forethought/afterthought-style heel
Shaping and grafting the toe with Kitchener stitch
Finishing details like weaving in ends, closing tiny gaps, and blocking

It’s like having me sitting on the couch knitting with you… without me stealing your good stitch markers. 😇

Camp Colorwork Course for knitters and crocheters to learn more color work techniques from professionals - Marly Bird

What’s Inside Camp Colorwork (Beyond Heartstrings)

Camp Colorwork is my flagship colorwork course in the Marly Bird House. Heartstrings is just one star in a much bigger constellation of training that helps you feel confident with:

Reading and working from colorwork charts
Choosing colors that play well together and don’t go muddy
Managing floats so your fabric doesn’t pucker
Knitting stranded colorwork in the round on hats, cowls, socks, and more
Troubleshooting common issues like tight fabric, uneven tension, and floppy or lost motifs

If you’re loving the look of Heartstrings but want big sister Marly there to cheer you on and show you exactly what to do, Camp Colorwork is where you’ll get that support.

Special CAMP COLORWORK Discount

Because you’re here for the Heartstrings socks, you can get 25% off the entire Camp Colorwork course when you use the code HEART at checkout.

Ready to enroll into Camp Colorwork directly with the coupon:
➡️ https://marlybird.thrivecart.com/camp-colorwork/?coupon=HEART

Want to read more about what’s inside first?
Learn more at: https://campcolorwork.com

If you’re ready to really level up your stranded knitting—and let Heartstrings be just the beginning—Camp Colorwork is your cozy, colorful next step. 🧶💗

A hand-knit sock featuring the Heartstrings knit sock pattern in pink and burgundy hearts, shown close-up and held by a smiling woman. Text reads: "HEARTSTRINGS Stranded Knit Sock Pattern." Pink flowers appear in the corner. -Marly Bird

FREE HEARTSTRINGS STRANDED COLORWORK SOCK PATTERN

SKILL LEVEL

Intermediate

MEASUREMENTS

To Fit Sizes

Small, Medium, Large

Finished Measurements

Socks measure 7 (8, 9)” [18 (20.5, 23) cm] in circumference.

Sample shown is large size.

Designer Tip: The best way to choose the correct size is to measure the circumference around the ball of the foot. You want to choose the size closest to that measurement.

Gauge

32 sts and 34 rounds = 4″ [10 cm] in Stranded Stockinette St (two-color knitting).

28 sts and 42 rounds = 4″ [10 cm] in Stockinette St in one color.

Note: It is best to match your gauge to the two-color pattern gauge given. If your one-color gauge varies slightly from the gauge given here, that’s ok; just be sure to make a note of it, as you will need to know it later in order to customize the foot-length.

MATERIALS

Yarn

Destination Yarn Souvenir DK weight (100% Superwash Merino Wool, 231 yds / 211 m, 3½ oz/ 100 g, CYCA# 3 light)

Color A: Slow Burn Red – 1¾ oz / 50g

Color B: Friends to Lovers Peach – 1¾ oz / 50g

Color C: Envy Green – 1¾ oz / 50g

Needle

U.S. 2 [2.75 mm] set of double pointed needles, or size required for gauge.

Notions

Removable stitch markers, scrap yarn, tapestry needle.

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ABBREVIATIONS

Approx – Approximately

Dec – Decrease

K – Knit

K2tog – Knit two together

P – Purl

RS – Right side

Sl – Slip

Ssk – Slip, slip, knit (see Special Stitches)

St st – Stockinette Stitch (knit on RS and purl on WS)

St(s) – Stitches

WS – Wrong side

Favorite This Pattern on Ravelry - Marly Bird

SPECIAL STITCHES

Ssk (Slip, Slip, Knit): Slip 2 stitches, one at a time, as if to knit. Insert left hand needle into the front of these two stitches and knit them together from this position (1 stitch decreased)

VIDEO TUTORIALS FOR SPECIAL TECHNIQUES

Long Tail Cast On >> Click Here for Video Help <<

No Cuss Cast On >> Click Here for Video Help <<

Duplicate Stitch >> Click Here for Video Help <<

Weave in Floats >> Click Here for Video Help <<

Kitchener Stitch >> Click Here for Video Help <<

Bury Ends >> Click Here for Video Help <<

A knitted sock with a pink and burgundy heart pattern, made using the Heartstrings knit sock pattern, lies on a white wooden surface next to a vibrant bouquet of pink and orange flowers. "Marly Bird" is printed in the bottom right corner. -Marly Bird

NOTES

The color instructions are given in an 8-stitch repeat, therefore it is necessary to repeat each row of chart instructions until all stitches of the round are used.
Use stranded knitting technique to knit the foot and leg.
Use caution when floating the unused colors on the wrong side of the sock. If you pull them too tight the sock will not fit!
- Designer Tip: when using stranded knitting on a small circumference, I recommend knitting inside out so the floats are on the outside of the sock until it is turned right side out to knit the toe and heel.
Weave the floats if one stretches over more than 5 stitches *if you are not comfortable with longer floats on your socks.
These socks use a forethought heel technique to preplan where the heel will be placed.
- Designer Tip: to get a slightly larger heel diagonal measurement, add a few rounds of knitting to the heel before beginning the heel decreases.

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I’m thrilled to share this amazing pattern with you, many patterns on my blog are absolutely free! I kindly request that you don’t copy and paste or distribute this pattern. Prefer an ad-free experience? Buy a digital PDF pattern for a small fee from one of my online stores for a seamless crafting journey.

I appreciate your support and readership. You are the reason I can keep doing what I love and sharing it with others. So, thank you from the bottom of my yarn-loving heart! Disclosure: This post contains affiliate links, meaning I get a commission if you decide to make a purchase through my links at no cost to you.

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Heartstrings Knit Sock Pattern

CUFF

With color A:

Using the long-tail cast on method, cast on 56 (64, 72) sts.

Divide the sts evenly onto 4 double pointed needles – 14 (16, 18) sts on each needle.

Round 1: * K1, p1; repeat from * to the end of the round.

Repeat round 1 until Cuff measures approx 2” [5 cm].

Cut color A.

With color C:

Next Round: Knit.

LEG

Continue in Stranded Stockinette technique following the colorwork chart for Leg through Round 32.

Colorwork Chart

Colorful knitting pattern chart featuring alternating peach and green blocks, indicating stitch placement for a project.

Forethought Heel Prep

When making stranded knit socks it is important to decide where you want the color jog seam to appear. I prefer to have it on the inside of the sock vs the front or back. That requires the heel placement specifically for the left and right sock.

Most sock patterns instruct to only work 1 row for the forethought heel but I find it easier to pick up for the heel with 3 rows.

Left Sock Only

Round 33: Work following the color chart across the first 28 (32, 36) sts, then slip those sts back onto the left hand needle(s).

Drop working yarn. With waste yarn the same weight as yarn used on sock, knit the same 28 (32, 36) sts just slipped, turn, p28 (32, 36), turn, k28 (32, 36).

Cut waste yarn.

Continue following the color chart with working yarns across last 28 (32, 36 sts) to complete the round.

Continue to Foot.

Right Sock Only

Round 33: Work following the color chart across 56 (64, 72) sts, then slip the last 28 (32, 36) sts worked back onto the left hand needle(s).

Drop working yarn. With waste yarn the same weight as yarn used on sock, knit the same 28 (32, 36) sts just slipped, turn, p28 (32, 36), turn, k28 (32, 36).

Cut waste yarn.

Continue to Foot.

FOOT

Continue in Stranded Stockinette technique following the color chart for Foot until Foot measures approx 5” [12.7 cm] shorter than desired final length.

Designer Tip: Why 5” [12.7 cm] shorter? Because the heel is approx 2½” [6.35 cm] and the toe is 2½” [6.35 cm]. Thus, the Foot color-section length should be less 5” [12.7 cm] than the desired final length.

Rounds 1-8 of the Foot chart are the pattern repeat.

Rounds 9-14 of the chart are the final six rounds before the toe, and measure approx ¾” [2 cm].

A grid with alternating peach and green squares, inspired by the Heartstrings knit sock pattern, labeled "Friends to Lovers Peach" and "Envy Green." Rows 1–8 (of 14) are outlined in red along the numbered axes. -Marly Bird

Cut colors B and C.

❇︎If you have been working your sock inside-out, it should now be turned right-side out, with RS facing you and WS facing the inside of the sock.

Continue with color A only as follows:

Round 1: K28 (32, 36), place removable marker into the fabric between sts, k28 (32, 36), place another marker as before.

Round 2 (dec round): * K1, k2tog, k to 3 sts before marker, ssk, k1; repeat from * once more — 4 sts dec’d, 24 (38, 32) sts remain.

Round 3: Knit around.

Repeat rounds 2 and 3 only until 16 (20, 24) sts total remain.

A close-up of knitting supplies: a pair of scissors, a large ball of pink yarn, red double-pointed knitting needles, the Heartstrings knit sock pattern, a metal darning needle, and a partially finished knit piece with pink and green patterns. -Marly Bird

Toe Grafting

Graft Toe sts together using Kitchener Stitch as follows (also see Video Tutorials):

Arrange sts so the 8 (10, 12) instep sts are on one needle, and the 8 (10, 12) sole sts are on another needle.

Hold both needles together in your left hand, with yarn tail on the first stitch on the back needle.

Cut a long tail from the working yarn (about 4 times the width of the fabric to be joined), and thread tail into yarn needle.

Step 1: Insert yarn needle purlwise into first st on front needle and pull it through, leaving st on the knitting needle.

Step 2: Insert yarn needle knitwise into first st on the back needle and pull it through, leaving st on the knitting needle.

Step 3: Insert yarn needle knitwise into first st on front needle and pull it through, then drop this st off knitting needle.

Step 4: Insert yarn needle purlwise into first st on front needle and pull it through, leaving st on the knitting needle.

Step 5: Insert yarn needle purlwise into first st on the back needle and pull it through, then drop this st off knitting needle.

Step 6: Insert yarn needle knitwise into first st on the back needle and pull it through, leaving st on the knitting needle.

Repeat steps 3-6 only, pausing to pull sts taut and neaten the seam after every couple of inches. Be sure to always pause after a step 6 so as to not lose your place.

When 2 sts remain, work step 3, then step 5, then fasten off.

A partially knitted mitten with intricate pink and green patterns, knitting needles inserted, and a ball of maroon yarn attached—evoking the cozy charm of the Heartstrings knit sock pattern—rests on a white surface. -Marly Bird

HEEL

Working on the right side of the sock, from right to left in the round directly below the waste yarn for the heel, insert the top of the needle under the right leg of each of the 28 (32, 36) sts.

With another needle, work the same process on the stitches directly above the waste yarn for the heel. Insert the tip of the needle under the right leg of each of the 28 (32, 36) stitches in the round above the waste yarn.

There are now 56 (64, 72) stitches on the two needles.

Remove the waste yarn starting at the stitch at the top left so it will unravel cleanly.

Don’t worry about picking up extra stitches at the gap. We will close the holes at the gap with the beginning and finishing tails of the heel.

Arrange the sts evenly on 4 double-pointed needles – 14 (16, 18) sts on each needle.

❇︎ If the sock is too snug at the instep/heel diagonal, add a few rounds and a few stitches to the heel before beginning the decrease rounds. Add an extra 2 stitches for every extra round you add. This will add more stitches and overall rounds to your heel and allow for a larger heel diagonal.

With color A:

Round 1: K28 (32, 36), place removable marker into the fabric between sts, k28 (32, 36), place another marker as before.

Round 2 (dec round): * K1, k2tog, k to 3 sts before marker, ssk, k1; repeat from * once more — 4 sts dec’d, 24 (28, 32) sts remain.

Round 3: Knit.

Repeat round 2 and 3 until 16 (20, 24) sts total remain on the needles.

Heel Grafting

Graft Heel sts together using Kitchener stitch as follows (also see Video Tutorials):

Arrange sts so the 8 (10, 12) back of leg sts are on one needle, and the 8 (10, 12) foot sts are on another needle.