Quilt block · Stars · Advanced
Green Mountain Star quilt block
A star of half-square triangle units round a dark center square, set in a ring of medium triangles on a light ground. Also called Aunt Mary’s Star.
What to cut for one block
A 6″ finished block measures 6½″ before it’s sewn into a quilt. Each fabric’s yardage is the least that cuts its strips across the width of fabric, with a strip to spare for straightening.
Background · Snow in the picture
28 squares and 32 triangles
- B16 squares 1⅝″cut once on the diagonal
- A28 squares 1¼″
Dark · Navy in the picture
The center square and 8 star points
- C1 square 2″
- B4 squares 1⅝″cut once on the diagonal
Medium · Denim in the picture
24 triangles
- B12 squares 1⅝″cut once on the diagonal
Worked out by @quarterinch/cutting · ¼″ seams included · strips cut across 42″ of usable width · the letters are the pieces the sewing steps name
A 9″ finished block measures 9½″ before it’s sewn into a quilt. Each fabric’s yardage is the least that cuts its strips across the width of fabric, with a strip to spare for straightening.
Background · Snow in the picture
28 squares and 32 triangles
- B16 squares 2″cut once on the diagonal
- A28 squares 1⅝″
Dark · Navy in the picture
The center square and 8 star points
- C1 square 2¾″
- B4 squares 2″cut once on the diagonal
Medium · Denim in the picture
24 triangles
- B12 squares 2″cut once on the diagonal
Worked out by @quarterinch/cutting · ¼″ seams included · strips cut across 42″ of usable width · the letters are the pieces the sewing steps name
A 12″ finished block measures 12½″ before it’s sewn into a quilt. Each fabric’s yardage is the least that cuts its strips across the width of fabric, with a strip to spare for straightening.
Background · Snow in the picture
28 squares and 32 triangles
- B16 squares 2⅜″cut once on the diagonal
- A28 squares 2″
Dark · Navy in the picture
The center square and 8 star points
- C1 square 3½″
- B4 squares 2⅜″cut once on the diagonal
Medium · Denim in the picture
24 triangles
- B12 squares 2⅜″cut once on the diagonal
Worked out by @quarterinch/cutting · ¼″ seams included · strips cut across 42″ of usable width · the letters are the pieces the sewing steps name
How it’s sewn
For the 6″ block. Choose another size above and these steps follow it.
- Make 24 half-square triangle units
Sew a Background B triangle to a Medium B triangle along their long edges. Press toward the Medium. Each measures 1¼″ (¾″ finished).
- Make 8 half-square triangle units
Sew a Background B triangle to a Dark B triangle along their long edges. Press toward the Dark. Each measures 1¼″ (¾″ finished).
- Make 8 sections, 2″ × 1¼″
Sew 2 half-square triangle units together in a row. Press the seams to one side. Each measures 2″ × 1¼″ (1½″ × ¾″ finished).
- Make 4 sections, 2″ × 1¼″
Sew 2 half-square triangle units together in a row. Press the seams to one side. Each measures 2″ × 1¼″ (1½″ × ¾″ finished).
- Sew the units and pieces into 7 rows
Lay out the units and pieces as in the picture and sew them into 7 rows. Press the seams in row 1 to the left, row 2 to the right, and so on, so they nest when the rows are joined.
- Join the rows
Join the 7 rows, matching and nesting the seams where they meet. Press the long seams open or to one side. The block measures 6½″ (6″ finished).
For the 9″ block. Choose another size above and these steps follow it.
- Make 24 half-square triangle units
Sew a Background B triangle to a Medium B triangle along their long edges. Press toward the Medium. Each measures 1⅝″ (1⅛″ finished).
- Make 8 half-square triangle units
Sew a Background B triangle to a Dark B triangle along their long edges. Press toward the Dark. Each measures 1⅝″ (1⅛″ finished).
- Make 8 sections, 2¾″ × 1⅝″
Sew 2 half-square triangle units together in a row. Press the seams to one side. Each measures 2¾″ × 1⅝″ (2¼″ × 1⅛″ finished).
- Make 4 sections, 2¾″ × 1⅝″
Sew 2 half-square triangle units together in a row. Press the seams to one side. Each measures 2¾″ × 1⅝″ (2¼″ × 1⅛″ finished).
- Sew the units and pieces into 7 rows
Lay out the units and pieces as in the picture and sew them into 7 rows. Press the seams in row 1 to the left, row 2 to the right, and so on, so they nest when the rows are joined.
- Join the rows
Join the 7 rows, matching and nesting the seams where they meet. Press the long seams open or to one side. The block measures 9½″ (9″ finished).
For the 12″ block. Choose another size above and these steps follow it.
- Make 24 half-square triangle units
Sew a Background B triangle to a Medium B triangle along their long edges. Press toward the Medium. Each measures 2″ (1½″ finished).
- Make 8 half-square triangle units
Sew a Background B triangle to a Dark B triangle along their long edges. Press toward the Dark. Each measures 2″ (1½″ finished).
- Make 8 sections, 3½″ × 2″
Sew 2 half-square triangle units together in a row. Press the seams to one side. Each measures 3½″ × 2″ (3″ × 1½″ finished).
- Make 4 sections, 3½″ × 2″
Sew 2 half-square triangle units together in a row. Press the seams to one side. Each measures 3½″ × 2″ (3″ × 1½″ finished).
- Sew the units and pieces into 7 rows
Lay out the units and pieces as in the picture and sew them into 7 rows. Press the seams in row 1 to the left, row 2 to the right, and so on, so they nest when the rows are joined.
- Join the rows
Join the 7 rows, matching and nesting the seams where they meet. Press the long seams open or to one side. The block measures 12½″ (12″ finished).
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Questions
Short answers.
Something else? A real person replies.
hello@quarterinch.app
Is Green Mountain Star the same block as Aunt Mary’s Star?
Usually, yes. Block names vary by region and by book, and the same block is often sold under several. Our library lists Aunt Mary’s Star as other name for this one, so a search for any of them finds it.
What size should I make it?
Its 8 × 8 grid lands on the ⅛″ marks at 6″, 9″ and 12″, so every piece measures with a ruler at all three. It also cuts cleanly at 4″, 7″, 8″, 10″, 14″, 15″, 16″ and 18″. In Quarter Inch you can make it any size, and it says when a cut falls between the lines.
Can I paper piece it?
Yes. It splits into 11 sections (A, B, C, D, E, F, G, H, I, J and K), each sewn on its own paper in order and then joined with straight seams. In Quarter Inch, the Foundations tab prints its papers at true size (with Quilter).
Is it a good block for a beginner?
It’s an advanced block: 93 pieces in 3 different shapes and 24 points to match. Practise the hard seams on scraps first. We work the level out from the block’s own geometry, never by eye.