Celtic Twist Quilt Block – Step-by-Step Tutorial

The Celtic Twist Block is a striking 12″ x 12″ quilt block that combines bold lines with interwoven shapes, creating a knot-like illusion reminiscent of traditional Celtic designs. Its geometric appeal and layered look make it an eye-catching centerpiece for quilts, table runners, or wall hangings.

Perfect for confident beginners, this block uses strip piecing and partial seams to achieve the twisting design. Once you get the hang of the block construction, you’ll be able to create multiple blocks for a stunning interconnected quilt layout.

Skill Level

Confident Beginner – Basic quilting knowledge recommended, including sewing an accurate ¼” seam allowance.

celtic Twist Quilt Block tutorial

Finished Block Size

12″ x 12″

Fabric Requirements

You will need five different fabrics for the block:

1. White/Green Print – Background fabric

Cutting Instructions

Cut in the order listed:

From White/Green Print (Background):

• 4 rectangles: 3½” x 6½”

• 1 square: 3½” x 3½”

• 4 squares: 2″ x 2″

From Dark Green Swirl Print, Medium Lime Mottle, Light Green Floral, and Dark Green Texture (cut from each):

• 1 strip: 2″ x 5″

• 1 rectangle: 2″ x 3½”

• 3 squares: 2″ x 2″

Piecing the Block

Step 1 – Making Pieced Squares (Diagram I)

• Sew together:

  • 1 white/green print 2″ square

  • 1 dark green swirl print 2″ square

  • 1 medium lime mottle 2″ x 3½” rectangle

• Align as shown in Diagram I to create one pieced square.

• Make 4 total, varying the fabric arrangements for interest.

Step 2 – Creating Pieced Rectangles (Diagram II)

• Draw a diagonal line on the wrong side of one lime 2″ square.

• Place it on a white/green print 3½” x 6½” rectangle (right sides together), aligning raw edges.

• Stitch on the drawn line. Trim ¼” away from the seam and press open.

• Repeat on the opposite end of the rectangle with light green floral 2″ square to complete the pieced rectangle.

• Make 4 total.

Step 3 – Assembling the Block Center with Partial Seams (Diagram III-A & III-B)

• Layout one 3½” white/green square in the center.

• Add 2″ x 5″ strips around the center square following Diagram III-A.

• Begin sewing the first strip with a partial seam – start about 2″ from the top edge and stop before reaching the corner.

• Open the strip, rotate, and add the next strip in sequence.

• Continue adding the remaining strips, then finish the partial seam to complete the center square.

Step 4 – Final Block Assembly (Diagram IV)

• Arrange:

  • Pieced squares from Step 1

  • Pieced rectangles from Step 2

  • Block center from Step 3

• Assemble into 3 rows as shown in Diagram IV.

• Sew rows together, ensuring seams interlock neatly.

Pressing

• Press seams toward the darker fabric for a crisp look.

• Press the final block flat before trimming if necessary.

Tips for Success

• Use a ¼” seam allowance throughout for accuracy.

• Chain piece units to speed up production.

• When making multiple blocks, lay them out before sewing to ensure the twist effect lines up.

celtic Twist Quilt Block tutorial

Creative Ideas

• Make several Celtic Twist Blocks and alternate with solid squares for a modern quilt.

• Use high-contrast fabrics for a bold graphic look or tone-on-tone prints for a subtle, elegant design.

• Try a monochromatic green palette for a classic Celtic vibe.

The Celtic Twist Quilt Block is a beautiful blend of precision and creativity, offering a timeless design that works in both modern and traditional quilts. By mastering its simple techniques and paying attention to color placement, you can create a quilt that feels intricate yet is enjoyable to sew. Whether you make a single block as a statement piece or a whole quilt full of interlocking twists, this pattern is sure to impress.