Mystery Quilt Alongs Quilt Block Patterns Quilt Patterns Stars of the Prairie

How to Make a Large Ohio Star Quilt Block

If you are looking for big block that packs a big punch, then this is it. This large Ohio star is easy to make and, when done, measure 18 1/2″. It would look good on its own as a mini or as part of a larger design, like my Stars of the Prairie 2021 Mystery Quilt. Learn how to make a large Ohio star quilt block in this tutorial.

I visited a prairie that is near my house the other day and it is amazing how much it is changing now. With the temperatures rising, it is coming to life again. In no time it will be full of blooms in all colors. Those gorgeous flowers are what I am trying to capture with the colors in this traditional block.

If you are participating in the mystery quilt, the details are near the end of the article. We’ve been having lots of fun making various blocks for the quilt. This is the 5th one we are making.

If you are here for the quilt block tutorial, but not for the mystery quilt, then scroll down a little bit for the instructions.

*Download the Ohio Star Quilt Block Pattern Here*

May Mystery Quilt Info

Please read all instructions carefully before beginning.

These instructions are for one block. Use a scant 1/4″ seam allowance throughout.

Supplies Needed

Along with the fabric, you will need some general quilting supplies.

You can find many of the items that I used to make this project in my Amazon Store.
As an Amazon Associate I earn from qualifying purchases.

How to Make a Ohio Star Quilt Block (18 1/2″)

Fabric Needed:

Background Fabric: Fat quarter, Fabric A: Fat eighth, Fabric B: 6 ½ inch square, Fabric C: 7 ¼ inch square

Cutting Instructions:

Background Fabric:

  • 4 squares cut 6 ½ inches by 6 ½ inches
  • 1 square cut 7 ¼ inches by 7 ¼ inches

Fabric A:

  • 2 squares cut 7 ¼ inches by 7 ¼ inches

Fabric B:

  • 1 square cut 6 ½ inches by 6 ½ inches

Fabric C

  • 1 square cut 7 ¼ inches by 7 ¼ inches

Video Tutorial

Assemble the Hourglass Units:

To make the hourglass units you will need all of the 7 ¼ inch squares. Match them up as follows:

  • Fabric A with Background Fabric: 1 pair
  • Fabric A with Fabric C: 1 pair

On each of the pairs, draw a diagonal line on the back (wrong) side of the lighter fabric. This will be your sewing guide.

Line up each pair of squares with front (right) sides facing each other.

Using a ¼ inch seam allowance, sew along both sides of the drawn diagonal line.

Cut down the center, along the drawn line. You will end up with two blocks that need to be pressed open.

DO NOT trim these units. Repeat with the other pair of 7 ¼ inch squares.

Next, take the four half square triangle units you just made and cut them in half as shown. You will have 4 triangles with fabric A and the background fabric, and 4 triangles that are made up of fabric C and fabric A.

Take one triangle from each pairing and match them up, right sides facing. Make sure that the same fabrics are not facing each other. Sew along the long side.

When done, you will have 4 blocks that look like this (photo above). They should measure 6 ½ inches square. Trim down if necessary.

Assemble the Block

Lay out the block as show. Sew the individual rows together first and then sew the rows together.

It should measure 18 ½ inches when finished.

My tester block

If You Are Participating in the 2021 Stars of the Prairie Mystery Quilt:

You need to make 1 of these blocks this month.

Feel free to join in the mystery quilt fun. You can find all of the details in this article.

In addition, I have this FB group for people who are participating. It’s a fun place to see what other people are doing for their blocks.

What we’ve done so far:

Show off your progress on social media! Make sure to use the hashtag #createwithclaudiaqal if you post any pictures!

*This mystery quilt along is for entertainment purposes only. Therefore, there are no prizes or giveaways.* Best efforts have been made to ensure that the instructions are correct, however sometime errors occur. If you have any questions, please contact us *


  1. Joanne Berndsen

    October 24, 2022 at 2:08 PM

    Thank you Claudia for sharing your quilting creativity ! !
    I have been looking for a 181/2 inch quilt block that would look good in a project for a while. thanks to Google this evenings choices brought me here ! I am now reading this !
    By the yard is so funny !
    take care,

    1. createwithclaudia_7j76hs

      October 30, 2022 at 7:29 AM

      Thank you Joanne – I have a few 18 1/2″ blocks patterns. They were part of a quilt along, but can easily be made separately.

  2. Helen

    January 28, 2024 at 10:41 PM

    With CENTER square being 6 1/2″, how do the outer 2 sides get sewn without a lot of excess fabric?

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