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Half Square Triangles

Master one of quilting's most basic blocks - the Half Square Triangle (HST) - with the Whirlwind Quilt pattern by Cotton and Joy.

In this class, you will learn how to construct half square triangles using the Creative Grids 15" Seam Guide Tool. Learn how to chain piece and how to properly pressing triangle seams. Our class project to practice these skills will be the baby size of the Whirlwind pattern by Cotton and Joy. This printed pattern is included in the class cost.

PLEASE NOTE: Many Students will have additional sewing tasks that will need to be completed outside of class.

Skill Level: Beginner
Skill Details:

Ages 15+

Must have a working knowledge of how to operate a sewing machine.

Just getting started? Take our Intro to Sewing, Part 1: Machine Basics class and our Intro to Sewing, Part 2: In the Sewing Room class before taking this class.

Must have knowledge of basic piecing and able to use consistent 1/4" seam allowances.

Just getting started? Take our Intro to Quilting Part 1: Piecing class.

Materials Included:

The Whirlwind pattern by Cotton and Joy is included with the class registration fee.

All materials needed for this class can be purchased for an additional $55. If you opt to only pay for the class, you will need to bring:

  • (6) fat quarters of quilting cotton
  • 1.5 yds of solid background quilting cotton
  • 15 inch Creative Grids Seam Guide
  • (1) Fabric Marking Pen
  • (1) coordinating cotton thread

Additional items you will need but are offered at classroom stations include:

  • Sewing machine (you may bring your own or use the classroom sewing machines)
  • 1/4" Foot with Guide
  • Pins (included at classroom station)
  • Fabric Marking tool (included at classroom station)
  • Ideal Sewing Gauge (included at classroom station)
  • Snips (included at classroom station)
  • Ruler (included at classroom station)
  • Rotary Cutter (included at classroom station)
  • Cutting Mat (included at classroom station)

Cancellation Policy

A Student may cancel a class registration via email ( or by phone at 214-324-5755.

Cancellations with more than 3 days prior notice may request a full refund. Cancellations received 1 - 3 days before the class will receive credit towards another class. Any cancellations on the day of the class cannot be refunded or transferred.

Read our full Classroom Policies here.

$75 Class + $55 Materials
(including materials with the class fee is optional)


Our Casa Linda location closes May 28th. We reopen June 1 at 2936 Reward Ln, Dallas. Note location when selecting a class date.

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Included Materials



This class cannot be purchased online. Please contact the store for more information.