Rainbow Blanket Knitting Pattern Free PDF – Smiling Colors
There is something deeply satisfying about casting on a project that promises to fill your home with color. A rainbow blanket is exactly that kind of project — one that begins as a simple stack of yarn and slowly transforms into something joyful, warm, and undeniably cheerful. Whether you are knitting for a new baby, a child who loves bright things, or simply treating yourself to a project that puts a smile on your face every time you pick it up, a rainbow blanket has a way of making the whole process feel celebratory from the very first row.
This free pattern and PDF guide walks you through everything you need to know to create a beautiful, Smiling Colors rainbow blanket from scratch. It is written for knitters of all levels, with clear instructions, helpful tips, and notes on how to adapt the design to your preferred size. You can download the PDF version to keep at your knitting basket, share with a friend, or print out and annotate as you go.
Why Knit a Rainbow Blanket?
Before diving into the pattern itself, it is worth taking a moment to appreciate why rainbow blankets have become such enduring favorites in the knitting community. Part of the appeal is purely visual — the way colors transition from one to the next gives even a straightforward stockinette or garter stitch blanket an almost magical quality. The pattern itself can be quite simple, and yet the finished object looks elaborate and thoughtful.
There is also the meditative rhythm of color-change knitting. Each time you introduce a new shade, the project feels refreshed. You are never stuck in a long stretch of monotony. Knitters who tend to get bored with large blankets often find that a rainbow approach keeps them engaged all the way to the cast-off edge.
And practically speaking, rainbow blankets make exceptional gifts. They are cheerful in nurseries, cozy on living room sofas, and bright enough to be used as photography props or play mats. A handmade rainbow blanket carries with it all the care and time you put into it, and recipients tend to treasure them for years.
About This Pattern: Smiling Colors
The Smiling Colors rainbow blanket is designed to be accessible, adaptable, and genuinely fun to make. It uses a simple striped construction, working through the colors of the rainbow from red to violet with some optional blending colors in between. The finished blanket has a soft, cozy texture and a clean, modern look that works in both classic and contemporary interiors.
The name comes from the idea that when you lay out all your yarn colors before you begin — those bright, cheerful skeins lined up in order — you cannot help but smile. The blanket carries that feeling all the way through to its completion.
Materials You Will Need
To make the Smiling Colors rainbow blanket in the standard size (approximately 36 by 45 inches, a generous lap or baby blanket), you will need the following:
Yarn: Worsted weight yarn in seven main colors. You will need approximately 150 to 200 yards of each color. The classic rainbow sequence runs red, orange, yellow, green, blue, indigo, and violet, but feel free to substitute any seven colors that speak to you. A gradient or ombre collection works beautifully for this pattern.
Needles: US size 7 (4.5mm) circular needles or straight needles, whichever you prefer. Circular needles are recommended for larger sizes because they hold the weight of the blanket more comfortably.
Notions: A tapestry needle for weaving in ends, scissors, stitch markers (optional but helpful), and a ruler or measuring tape.
Gauge: Approximately 18 stitches and 24 rows to 4 inches in stockinette stitch. For this pattern, gauge does not need to be precise unless you are sizing the blanket for a specific measurement. A swatch is always a good idea to check your tension and ensure the fabric is the softness you want.
Yarn Recommendations
The yarn you choose will have a significant impact on the final feel of the blanket. For a baby blanket, look for something soft and machine washable, as practicality matters enormously for gifts that will be used regularly. Some excellent choices in the worsted weight category include:
Lion Brand Pound of Love is a longtime favorite for baby blankets because it is machine washable, very soft, and comes in a wide range of colors. It is also budget-friendly, which makes it ideal when you are buying seven skeins at once.
Paintbox Yarns Simply DK or Simply Worsted offers a lovely range of clear, saturated colors that are perfect for a rainbow project. The color names tend to be bold and distinct, making it easy to plan your palette.
Caron Simply Soft is another accessible and widely available choice. It has a lovely drape and a gentle sheen that makes colors look especially vibrant.
If budget is not a concern, Madelinetosh, Spincycle, or indie-dyed yarns in coordinating colorways can take the Smiling Colors blanket to a truly heirloom level.
Pattern Instructions
Abbreviations Used
CO: cast on
K: knit
P: purl
RS: right side
WS: wrong side
BO: bind off
St(s): stitch(es)
Rep: repeat
Cast On
Using color 1 (Red), CO 162 stitches. If you are using circular needles, do not join — you will be working back and forth in flat rows.
Garter Border (worked in Color 1)
Row 1 (RS): Knit all stitches.
Row 2 (WS): Knit all stitches.
Row 3 (RS): Knit all stitches.
Row 4 (WS): Knit all stitches.
Row 5 (RS): Knit all stitches.
Row 6 (WS): Knit all stitches.
Work 6 rows of garter stitch in Color 1. This creates a neat border at the bottom of the blanket and helps the edge lie flat.
Body of the Blanket
The body is worked in a simple stockinette stitch with a garter border on each side edge. This combination gives the blanket a clean look while preventing curling.
Side borders: On every row, knit the first 5 stitches and the last 5 stitches. These edge stitches are worked in garter stitch throughout the entire blanket to maintain flat, tidy edges.
Center stitches: On RS rows, knit the center 152 stitches. On WS rows, purl the center 152 stitches.
The color stripe sequence is as follows. Each color block is worked for 22 rows, which creates a generous stripe before the color changes.
Work 22 rows in Color 1 (Red).
Work 22 rows in Color 2 (Orange).
Work 22 rows in Color 3 (Yellow).
Work 22 rows in Color 4 (Green).
Work 22 rows in Color 5 (Blue).
Work 22 rows in Color 6 (Indigo).
Work 22 rows in Color 7 (Violet).
If you would like a longer blanket, simply work additional rows in each color section or add a second round of the full rainbow sequence before binding off. The pattern is infinitely adjustable this way.
Transition Tips
When changing colors, cut the old yarn leaving a six-inch tail and join the new color at the beginning of a RS row. This keeps all your ends on the same side of the work and makes weaving in easier later.
Some knitters prefer to carry the yarn up the side rather than cutting it. This works well with this pattern because the stripes are relatively compact — 22 rows is a manageable distance to carry yarn along the edge. If you carry the yarn, twist the working yarn around the carried strand every few rows to avoid long, loose floats on the edge.
Top Garter Border
After completing all seven color sections, work 6 rows of garter stitch in Color 7 (Violet) to mirror the border at the cast-on edge.
Bind Off
Using Color 7, bind off all stitches loosely in knit. A loose bind off is important for a blanket because a tight edge can cause the top to pucker and will affect the drape of the finished piece. If you tend to bind off tightly, consider going up a needle size for this step.
Finishing
Weave in all ends using your tapestry needle. Take your time with this step. Going in one direction and then looping back in the opposite direction will help the ends stay secure, especially through the color-change rows where there may be multiple tails close together.
Block the blanket by soaking it in lukewarm water with a small amount of wool wash or gentle soap, gently squeezing out the water (do not wring), and laying it flat to dry on a clean towel or blocking mat. Blocking will even out your tension, help the colors look their best, and give the blanket a beautifully professional finish. Even machine-washable yarns benefit from hand blocking for the finished object.
Size Variations
One of the best things about this pattern is how easily it scales. Here are a few size options to guide you:
Newborn size (approximately 28 by 34 inches): CO 128 stitches, work 14 rows per color section.
Baby lap blanket (approximately 36 by 45 inches): CO 162 stitches, work 22 rows per color section. This is the standard size described above.
Toddler throw (approximately 40 by 52 inches): CO 180 stitches, work 28 rows per color section.
Full throw (approximately 50 by 60 inches): CO 225 stitches, work 32 rows per color section. You will need significantly more yarn for this size — plan for 250 to 300 yards per color.
For any size, the principle is the same: maintain the 5-stitch garter border on each side, work the center stitches in stockinette, and adjust the row count per stripe to achieve your desired length.
Color Palette Ideas
While the classic ROYGBIV rainbow sequence is always beautiful, do not feel constrained by tradition. Here are some alternative palette ideas that work wonderfully with this pattern:
Pastel Rainbow: Replace all seven colors with soft, dusty versions — blush pink, peach, butter yellow, sage green, sky blue, lavender, and lilac. This palette is especially popular for baby showers and creates an ethereal, dreamy blanket.
Jewel Tones: Go rich and deep with ruby, burnt orange, golden yellow, emerald, sapphire, midnight blue, and deep plum. This version feels luxurious and works beautifully as an adult throw.
Earth Tones Rainbow: Think terracotta, rust, ochre, olive, dusty teal, slate, and heather purple. This more muted take on the rainbow concept feels very current and at home in a modern, minimalist space.
Neon Pop: For the boldest possible blanket, choose the most saturated, vivid versions of each color. Neon pink instead of red, electric orange, sunshine yellow, lime green, cobalt blue, violet, and hot purple. This version is absolutely showstopping and makes a wonderful gift for a child who loves bright things.
Tips for Beginners
If this is your first large knitting project, a few reassurances are in order. The Smiling Colors blanket is worked entirely in flat rows using basic knit and purl stitches. There are no increases, decreases, cables, lace patterns, or complex techniques involved. If you can knit and purl and you know how to cast on and bind off, you have everything you need to complete this blanket.
A few practical tips that will make the process smoother: Use stitch markers to mark the boundary between the garter border and the stockinette center. After a few rows it will become intuitive, but having that visual reminder is helpful in the early stages. Count your stitches regularly — perhaps at the end of each row for the first color section — until you feel confident. If you notice an error, try to catch it quickly rather than working too far past it. In a blanket this size, unknitting several rows is much less painful than unknitting an entire color section.
How to Use the Free PDF
The free PDF version of this pattern is formatted for easy printing and use at the knitting basket. It includes all the instructions above in a clean, easy-to-read layout, a materials checklist, the full stitch abbreviation guide, and a simple chart showing the color sequence and row counts.
You can print the pattern on standard letter-size or A4 paper. Many knitters find it helpful to print two copies — one to keep clean for reference and one to annotate with personal notes, row counts, and any modifications they make along the way. The PDF is also formatted to be readable on tablets and phones, so you can easily pull it up while you work without needing a printed copy at all.
Caring for Your Finished Blanket
A blanket that is made with love deserves to be cared for well. Always check the care instructions on your yarn label before washing, as different fibers have different needs. Most acrylic and acrylic-blend yarns can be machine washed on a gentle cycle and tumbled dry on low. Wool and wool-blend yarns generally need to be hand washed in cool water to prevent felting.
If you are giving the blanket as a gift, include a small card with the care instructions. Recipients who are not crafters may not know that a handmade knitted blanket sometimes needs a little extra care, and clear guidance will help the blanket stay beautiful for years.
A Few Final Thoughts
A rainbow blanket is one of those projects that stays with you. Long after you have cast off and woven in the last end, you will find yourself looking at it — draped over a chair, tucked around a sleeping child, folded on a shelf — and feeling a quiet pride in having made something so colorful and lasting out of nothing more than yarn and time.
The Smiling Colors pattern is designed to make that process as enjoyable as possible. It is simple enough that the knitting itself becomes a kind of pleasant meditation, and the constant color changes mean the project always feels fresh and forward-moving. Whether you are a seasoned knitter looking for a satisfying weekend project or a beginner tackling your first blanket, this pattern was made for you.
Download the free PDF, gather your yarn, and cast on. Your rainbow blanket is waiting.
