Mystery Quilt Alongs Quilt Block Patterns Stars of the Prairie

How to Make a Square in a Square Quilt Block

February has arrived and, while lots of us (including me) start to think about Valentine’s Day and warmer weather, there are plenty of other fun things going on too. Things like my 2021 mystery quilt called “Stars of the Prairie”. It is the second month for this event, and this time we learn how to make a square in a square quilt block.

This block is a traditional one that is often used in “I Spy” quilts or other designs that feature fussy cutting. If you want to show off a specific design from a piece of fabric, then this is a good block for you.

The finished block measures 12 1/2″ square and comes together easily.

Start raiding your scrap bins and get ready to show off all of those pretty fabrics with the popular square in a square block.

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

February Mystery Quilt Info

*Download the Square in a Square Quilt Block Pattern Here*

Please read all instructions carefully before beginning.

We will be making four blocks this month. Use a scant 1/4″ seam allowance throughout.

Supplies Needed

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

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For the Stars of the Prairie mystery quilt we will be making 4 of the Square in a Square quilt blocks.

Fabric Needed (for all 4 blocks):
  • Background Fabric: ½ yard
  • Fabric A: Fat quarter
  • Fabric B: Fat quarter
Cutting Instructions (for all 4 blocks):
  • Background Fabric: 8 squares cut 6 7/8 inches by 6 7/8 inches
  • Fabric A: 4 squares cut 7 ¼ inches by 7 ¼ inches
  • Fabric B: 4 squares cut 6 ½ inches by 6 ½ inches

How to Make a Square in a Square Quilt Block (Instructions to Make 1 Block)

Video Tutorial

Block Layout

Mosaic Block Pattern

To make one block you will need the following:

  • Background Fabric: 2 squares cut 6 7/8 inches by 6 7/8 inches
  • Fabric A: 1 squares cut 7 ¼ inches by 7 ¼ inches
  • Fabric B: 1 squares cut 6 ½ inches by 6 ½ inches

Cut the two background fabric squares in half on the diagonal. You will have 4 triangles. Set aside.

Take the 7 ¼ inch squares of fabric A and cut it diagonally twice.

With right (front) sides of fabric facing each other, sew the long side of one of the fabric A triangles to one side of the fabric B square. Use a scant 1/4″ seam allowance. Press. Repeat on the opposite side.

Tip: To make sure the triangle is centered with the square, it might help to finger press the square and the triangle in half and match the center fold lines.

Repeat on the other two sides of the square. The block will look like this.

Next, add the background fabric triangles to the outsides, making sure to center the long side of the triangles to the inner square. Add them in the same manner that you did with the first set of triangles. Trim off the small dog ears around the block.

Trim down as needed. The block should measure 12 ½ inches square.

My Tester Block

My February tester block.

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

Repeat until you have 4 Square in a Square quilt blocks.

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 at claudia{at}createwithclaudia{dot}com*


  1. Vivian Oaks

    February 1, 2021 at 2:59 PM

    Thank you so much for the freebies you’re offering! I found your site last month and immediately signed up for your newsletter. Now I’m downloading your patterns, and really appreciate that they’re no cost. Some quilters that I’ve followed for years are now charging for their BOM’s or quilts. While I can appreciate the fact that they might need the income, or it’s their full-time business, we all can’t afford to pay for all the patterns being offered that we’d like to get. I appreciate your willingness to share your creativity with us freely. I love what I’ve seen of your site and will continue to follow you and check out your emails when you send them. Blessings for the coming year – it’s got to be better than the last!!! 🙂

    1. createwithclaudia_7j76hs

      February 2, 2021 at 4:30 AM

      Thank you so much for your kind comments. I appreciate it.

  2. Susan

    February 2, 2021 at 1:56 PM

    Thank you for the free block and the BOM. Thank you also for the tutorial and the video. They really help a newbie like me.

  3. Sue

    February 28, 2021 at 6:57 PM

    I just found your site and I love it . I want to do the mystery quilt for 2021. How do I get January block instructions. Sue and do I need to sign up some where?

    1. createwithclaudia_7j76hs

      March 1, 2021 at 8:31 AM

      Thanks so much! No sign up needed. I post the block at the beginning of each month. Here is info about the entire mystery quilt: and here is the January block: I have a fb group where I post the instructions or if you prefer, you can sign up for my email where the pattern is sent out as well.

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