A511 Crochet Triangle Blanket

How to Crochet a Triangle Blanket

Crochet a colourful square blanket from full and half triangle motifs. The geometric pieces are worked separately, arranged into a repeating pattern and sewn together before a simple border is added.

The finished blanket measures approximately 104 cm square and uses four coordinating shades of 8 ply merino yarn.

Project Details

• Project number: A511
• Difficulty: Easy crochet
• Finished size: approximately 104 cm × 104 cm
• Construction: Joined crochet motifs

What You Will Need

Yarn

• Colour 1 – Marine Blue: 4 × 50 g balls
• Colour 2 – Cream: 6 × 50 g balls
• Colour 3 – Silver: 4 × 50 g balls
• Colour 4 – Mint: 4 × 50 g balls

The original project uses Lincraft Baby 8 Ply Merino.

Hook and Equipment

• 5.50 mm crochet hook
• Wool needle for sewing motifs and weaving in ends

Alternative Yarns

Choose a soft DK or 8 ply yarn that produces motifs of a similar size using a 5.50 mm hook. Match the replacement yarn by total metreage rather than ball count.

• Machine-washable 8 ply wool: A warm alternative with good stitch definition.
• Merino or merino-blend 8 ply: The closest substitute for softness, warmth and elasticity.
• Acrylic 8 ply: An economical, easy-care option suited to frequent washing.
• Wool and acrylic blend: Combines warmth with greater durability and easier care.
• Cotton or cotton-blend 8 ply: Creates a cooler, heavier blanket with less stretch.

Avoid highly textured or fluffy yarns, as they may obscure the open treble pattern and make the motif seams bulky.

Tension

The project sheet states that tension is not critical. However, crochet one complete triangle before beginning the full set and check that its size is suitable for a finished blanket of approximately 104 cm square.

Crochet Abbreviations

• ch: chain
• sl st: slip stitch
• dc: double crochet
• tr: treble crochet
• sp: space
• beg: beginning
• rep: repeat

Make the Full Triangles

Make 14 full triangles in each of the four colours.

1. Using the 5.50 mm hook, make 4 ch and join with a sl st into the first chain to form a ring.
2. Row 1: 4 ch, which counts as 1 tr and 1 ch throughout. Work 3 tr into the ring, 1 ch, 1 tr. Turn.
3. Row 2: 4 ch, work [3 tr in the next 1-ch space, 1 ch] twice, then 1 tr in the third chain of the turning chain. Turn.
4. Row 3: 4 ch, work [3 tr in the next 1-ch space, 1 ch] three times, then 1 tr in the third chain. Turn.
5. Continue in this manner, adding one additional 3 tr, 1 ch group on each row.
6. Row 8: Work 8 groups across the row, then finish with 1 tr in the third chain.
7. Row 9: 4 ch, work [3 tr in the next 1-ch space, 1 ch] nine times, then 1 tr in the third chain.
8. Fasten off.

Make Half Triangle A

Make 2 Half Triangle A motifs in each colour.

1. Make 4 ch and join with a sl st to form a ring.
2. Row 1: 4 ch, work 2 tr into the ring. Turn.
3. Row 2: 4 ch, 3 tr in the next 1-ch space, 1 ch, 1 tr in the third chain. Turn.
4. Row 3: 4 ch, 3 tr in the next 1-ch space, 1 ch, 1 tr in the next 1-ch space, 1 tr in the third chain. Turn.
5. Rows 4–9: Continue in the established pattern, increasing the number of 3 tr groups as shown in the project sheet.
6. Fasten off after Row 9.

Make Half Triangle B

Make 2 Half Triangle B motifs in each colour.

1. Make 4 ch and join with a sl st to form a ring.
2. Row 1: 3 ch, which counts as 1 tr throughout. Work 1 tr, 1 ch and 1 tr into the ring. Turn.
3. Row 2: 4 ch, 3 tr in the next 1-ch space, 1 ch, 1 tr in the third chain. Turn.
4. Row 3: 3 ch, 1 tr in the next 1-ch space, 1 ch, 3 tr in the next 1-ch space, 1 ch, 1 tr in the third chain. Turn.
5. Continue following the alternating edge treatment shown in the source pattern until Row 9 is complete.
6. Fasten off.

Assemble the Blanket

1. Lay out the full and half triangles in the arrangement shown in the finished project image.
2. Position Half Triangle A along the right-hand edge.
3. Position Half Triangle B along the left-hand edge.
4. Using Colour 2, sew the motifs together neatly.
5. Keep the joins even and avoid pulling the seams too tightly.

Add the Border

1. Using Colour 2, work 2 rounds of double crochet evenly around the outer edge of the blanket.
2. Work 1 final round of crab stitch.
3. Fasten off and weave in all ends.

What Is Crab Stitch?

Crab stitch is a decorative edging made by working double crochet in the opposite direction from normal. For a right-handed crocheter, this means working from left to right.

The reversed stitches form a firm, twisted cord-like edge that helps the blanket hold its shape.