Prism Cascade Geometric Square Curtain Free Pattern – Knitted Window Art

Transform your window into a kaleidoscope of color with this stunning knitted geometric square curtain. Each diamond and square interlocks in a mesmerizing gradient, creating a modern, textural take on light filtering that adds a cozy, artistic touch to any room. This pattern is perfect for boho-modern interiors and makes a truly unique DIY home decor statement. Best of all, it's constructed from individual squares, making it an approachable project for knitters of all skill levels—even beginners can create this showstopper with confidence.

With earthy tones of terracotta, sage green, mustard yellow, and dusty blue transitioning from a creamy off-white base, this curtain will become the focal point of any space. The garter stitch ridges catch the light beautifully, while the worsted-weight cotton yarn provides a soft, drapey feel that filters sunlight with a warm, inviting glow.

Materials Needed

Before you begin, gather the following supplies:

• Yarn: Worsted weight cotton or cotton-blend yarn in 5 colors:
  • Color A: Cream (approx. 400 yards)
  • Color B: Terracotta (approx. 300 yards)
  • Color C: Sage Green (approx. 300 yards)
  • Color D: Mustard Yellow (approx. 300 yards)
  • Color E: Dusty Blue (approx. 300 yards)
• Needles: US 7 (4.5 mm) knitting needles
• Notions: Tapestry needle for weaving ends and seaming, stitch markers (optional), scissors
• Gauge: 20 stitches and 28 rows = 4 inches in Stockinette stitch (for reference; exact gauge is not critical for this project)

Understanding the Construction

This curtain is built from 20 individual geometric squares, each measuring approximately 6 inches x 6 inches after blocking. The squares are knitted from the bottom up, starting with a cast-on edge and decreasing on one side to create a diamond shape. Each square uses two colors: the main color for the first 15 rows, then a second color for the remaining decreases, creating a beautiful gradient effect.

For a standard 36-inch wide window, you'll need 20 squares arranged in a 4×5 grid. Adjust the number of squares to customize the width and length for your specific window.

Step-by-Step Instructions

Square Pattern (Make 20 Squares)

Each square is worked flat, starting with a cast-on of 30 stitches. The decreases are always worked on the right side (RS) rows, with wrong side (WS) rows worked entirely in knit (garter stitch). This creates a subtle ridged texture that adds visual interest.

Row 1 (RS): With Color A, cast on 30 stitches.

Row 2 (WS): Knit all stitches.

Row 3: Knit 14, k2tog (knit 2 together), knit 14. (29 stitches)

Row 4: Knit all stitches.

Row 5: Knit 13, k2tog, knit 14. (28 stitches)

Row 6: Knit all stitches.

Row 7: Knit 12, k2tog, knit 14. (27 stitches)

Row 8: Knit all stitches.

Row 9: Knit 11, k2tog, knit 14. (26 stitches)

Row 10: Knit all stitches.

Row 11: Knit 10, k2tog, knit 14. (25 stitches)

Row 12: Knit all stitches.

Row 13: Knit 9, k2tog, knit 14. (24 stitches)

Row 14: Knit all stitches.

Row 15: Knit 8, k2tog, knit 14. (23 stitches)

Row 16: Knit all stitches.

Row 17: Knit 7, k2tog, knit 14. (22 stitches)

Row 18: Knit all stitches.

Row 19: Knit 6, k2tog, knit 14. (21 stitches)

Row 20: Knit all stitches.

Row 21: Knit 5, k2tog, knit 14. (20 stitches)

Row 22: Knit all stitches.

Row 23: Knit 4, k2tog, knit 14. (19 stitches)

Row 24: Knit all stitches.

Row 25: Knit 3, k2tog, knit 14. (18 stitches)

Row 26: Knit all stitches.

Row 27: Knit 2, k2tog, knit 14. (17 stitches)

Row 28: Knit all stitches.

Row 29: Knit 1, k2tog, knit 14. (16 stitches)

Row 30: Knit all stitches.

Row 31: K2tog, knit 14. (15 stitches)

Row 32: Knit all stitches.

Row 33: K2tog, knit 13. (14 stitches)

Row 34: Knit all stitches.

Row 35: K2tog, knit 12. (13 stitches)

Row 36: Knit all stitches.

Row 37: K2tog, knit 11. (12 stitches)

Row 38: Knit all stitches.

Row 39: K2tog, knit 10. (11 stitches)

Row 40: Knit all stitches.

Row 41: K2tog, knit 9. (10 stitches)

Row 42: Knit all stitches.

Row 43: K2tog, knit 8. (9 stitches)

Row 44: Knit all stitches.

Row 45: K2tog, knit 7. (8 stitches)

Row 46: Knit all stitches.

Row 47: K2tog, knit 6. (7 stitches)

Row 48: Knit all stitches.

Row 49: K2tog, knit 5. (6 stitches)

Row 50: Knit all stitches.

Row 51: K2tog, knit 4. (5 stitches)

Row 52: Knit all stitches.

Row 53: K2tog, knit 3. (4 stitches)

Row 54: Knit all stitches.

Row 55: K2tog, knit 2. (3 stitches)

Row 56: Knit all stitches.

Row 57: K2tog, knit 1. (2 stitches)

Row 58: K2tog. (1 stitch)

Row 59: Knit 1, then cut yarn leaving a 6-inch tail and pull through the last loop to secure.

Color Sequence for Squares

To achieve the beautiful gradient effect, you'll switch colors after Row 15. At the beginning of Row 16, join your second color and continue knitting with it for the remainder of the square. Make 4 squares in each of the following color combinations:

• A to B (Cream to Terracotta) – 4 squares
• A to C (Cream to Sage Green) – 4 squares
• A to D (Cream to Mustard Yellow) – 4 squares
• A to E (Cream to Dusty Blue) – 4 squares
• B to C (Terracotta to Sage Green) – 1 square
• B to D (Terracotta to Mustard Yellow) – 1 square
• B to E (Terracotta to Dusty Blue) – 1 square
• C to D (Sage Green to Mustard Yellow) – 1 square
• C to E (Sage Green to Dusty Blue) – 1 square
• D to E (Mustard Yellow to Dusty Blue) – 1 square

Total: 20 squares

Assembly

Once all 20 squares are complete, it's time to bring your curtain together.

Step 1: Block Your Squares
Wet block each square to exactly 6×6 inches. To do this, soak the squares in lukewarm water with a mild wool wash, gently squeeze out excess water (don't wring), and pin them to a blocking mat or towel at the correct dimensions. Allow them to dry completely before proceeding.

Step 2: Arrange the Layout
Lay out your squares in a 4×5 grid (4 columns wide, 5 rows tall) on a flat surface. Arrange them to create a pleasing gradient, with the cream-colored tips pointing in alternating directions to form a larger diamond pattern across the whole curtain. Play with the arrangement until you're happy with the color flow—this is your artistic moment!

Step 3: Seam the Squares Together
Using a tapestry needle and matching yarn (use the color of the squares being joined), whip stitch the squares together on the wrong side. Place the squares with right sides facing each other and sew through the edge stitches, ensuring the seams are flat and secure. Take your time to keep the seams even—this will ensure your curtain hangs beautifully.

Step 4: Create the Top Edge
With the right side facing you, pick up and knit 1 stitch for every 2 rows along the top edge of the assembled curtain. Knit 4 rows of garter stitch (knit every row), then bind off loosely. This creates a sturdy, neat edge that will support the weight of the curtain.

Step 5: Add the Rod Casing
Fold the top edge over to the wrong side, creating a casing wide enough to accommodate your curtain rod (typically 1.5–2 inches). Pin in place, then sew down the folded edge using a whip stitch or running stitch, leaving openings at each end for the rod to slide through. Make sure the casing is even across the entire width.

Step 6: Weave in All Ends
Using your tapestry needle, weave in all loose yarn ends on the wrong side of the curtain. Trim any excess yarn carefully.

Tips for Success

• Keep track of your rows: Use a row counter or place a stitch marker every 10 rows to avoid losing your place in the pattern.
• Consistent tension: Try to maintain even tension throughout, especially when switching colors. This will help your squares match in size.
• Customize your size: For a wider window, add more squares to your grid. For a longer curtain, add more rows. The pattern is infinitely scalable!
• Light filtering: The garter stitch creates small gaps between stitches that allow soft light to filter through, creating beautiful shadow patterns in your room.

Final Thoughts

This Prism Cascade Geometric Square Curtain is more than just a window treatment—it's a piece of functional art that brings warmth, texture, and color to your home. The modular construction makes it a rewarding project that you can complete square by square, and the result is a stunning, one-of-a-kind curtain that will be admired for years to come.

Whether you're a seasoned knitter looking for a unique home decor project or a beginner ready to take on something special, this pattern offers the perfect balance of simplicity and visual impact. So grab your yarn, settle into your favorite chair, and start creating your own knitted window masterpiece!

Happy knitting!