Traditional / Public Domain — associated with Irish and Irish-American quilting traditions
A stunning pattern built entirely from simple nine-patch blocks and plain alternate blocks that, when set together, create a continuous diagonal chain of squares across the quilt. The visual complexity belies its simple construction, making it a favorite first quilt project.
The Single Irish Chain dates to the early 1800s and is strongly associated with Irish and Scots-Irish immigrants who settled in the Appalachian region. The pattern likely evolved from woven coverlet designs that Irish weavers brought to America. It was one of the earliest patterns to exploit the visual magic of alternating two simple blocks.
Irish Chain quilts were a symbol of heritage for Irish-American families, especially during and after the Great Famine emigrations of the 1840s. The interlocking chain motif symbolized the bonds of community and family. The pattern comes in Single, Double, and Triple Irish Chain variations of increasing complexity. Green and white colorways are traditional, honoring Irish roots.
Also known as: Single Irish Chain, Grandmother's Chain, Chain of Squares
finished Block Size
12"
seam Allowance
1/4"
grid Basis
3x3 grid (each unit finishes to 4")
units Required
Nine-patch block + plain alternate block (set together to form the chain)
All measurements include 1/4" seam allowance unless noted.
| Piece | Fabric | Cut Size | Qty | Notes |
|---|---|---|---|---|
| Chain Square | Chain (dark) | 4 1/2" x 4 1/2" | 5 | For the nine-patch block — corners and center |
| Background Square | Background | 4 1/2" x 4 1/2" | 4 | For the nine-patch block — side positions |
| Alternate Block | Background | 12 1/2" x 12 1/2" | 1 | Plain alternate block; cut 1 per nine-patch made |
Cut five 4 1/2" squares from chain fabric and four 4 1/2" squares from background fabric. For efficiency, use strip piecing: cut 4 1/2" strips across width of fabric.
Tip: Strip piecing is the fastest approach: sew Strip Set A (chain-background-chain) and Strip Set B (background-chain-background), then crosscut at 4 1/2" intervals.
Arrange in a 3x3 grid: Row 1 = Chain, Background, Chain. Row 2 = Background, Chain, Background. Row 3 = Chain, Background, Chain. Sew each row with 1/4" seams, press, and join rows. Block measures 12 1/2" unfinished.
Cut plain 12 1/2" squares from background fabric. You need one alternate block for every nine-patch block.
Lay out blocks in alternating positions: Nine-Patch, Plain, Nine-Patch, Plain in Row 1. Offset the next row: Plain, Nine-Patch, Plain, Nine-Patch. The chain squares of adjacent nine-patch blocks will align diagonally to form the continuous chain.
Tip: Use a design wall or the floor to lay out the entire quilt top before sewing — the chain effect only appears when multiple blocks are placed together.
Sew blocks into rows with 1/4" seams, pressing seams toward the plain blocks. Then join rows, pressing row seams in alternating directions.
Step back and check that the chain color forms continuous diagonal lines across the quilt top. The chain squares from neighboring nine-patch blocks should touch at corners to create the signature interlocking chain effect.
See how this traditional pattern looks in different color combinations.
Classic alternating set — nine-patch and plain blocks in checkerboard arrangement
Add borders in the chain color for a framed look
Use a third accent color in the center square of each nine-patch for added interest