How to Sew Triangles Together for Quilting – PART 2

Sewing together triangles is quite easy when you know how and it’s something worth learning because you can put together a triangle quilt quite quickly.

We have a complete step-by-step tutorial on how to cut triangles for quilting but in this post, we are going to learn how to sew them together.

how to sew triangles for quilting

 This is Part 2 of our Cutting & Sewing Triangles for Quilting tutorial  

Watch the video below for Part 1  РHow to Cut Triangles for Quilting


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  • Before you start sewing your triangles together, it’s important to note that each triangle will have 2 bias edges and a cross-grain edge.
  • You will be able to tell the difference between the two as the bias edges are stretchy. The cross-grain edge is less so.
  • You can see how we have sorted the triangles below and pinned the cross-grain edge for each color stack. This makes it easy to know where the cross grain is as we start to sew.

  • When you are ready to start sewing, lay out your triangles in the pattern shown below – one up, one down, one up, one down and so on.
  • You need to ensure that the cross grain edges are at the top and bottom as shown in the image below.

  • Place one triangle on top of the corresponding triangle (right sides together) and sew along the bias edge with a quarter-inch seam.

  • Once sewn it should look like this.

  • Now place the other triangle over the middle triangle (right sides together).

  • Now sew down the bias edge with a 1/4″ seam.

  • Your triangles should now look like this.

  • You can continue to add more triangles in the same fashion until you have the strip as long as is required for your particular project.
  • You can then create more strips as needed and sew them together as we have done for this table runner. Click the link for the triangle table runner tutorial.