The Back Post Single Crochet Blanket Block Pattern is fun and simple. This crochet block adds texture and stretch to your blanket. Plus, this basic stitch looks great in any color combination. Whether you’re a beginner or an experienced crocheter, you’ll love how easy and satisfying this pattern is!
Gather Your Supplies
Here’s what you’ll need:
- Yarn: Worsted Weight #4 suggestions:
- Premier Just Yarn, Ruby
- I Love This Yarn, Navy, White
- Or MainStays, White
- Hook Size: 5.5mm
- Tools: Stitch Marker, Yarn Needle, Row Counter, Measuring Tape, Yarn Snips or Scissors

Understanding the Back Post Single Crochet Stitch
This Back Post Single Crochet Blanket Block Pattern is all about the Back Post Only Single Crochet stitch. Instead of working through both loops like a regular single crochet, you’ll insert your hook into the back loop only for every stitch—except the first and last stitch in each row. This creates a beautiful ridged texture while keeping the fabric soft and stretchy.
Pro tip: This block has a lot of stretch, so avoid pulling on it too much when measuring!
Step-by-Step Instructions for the Back Post Single Crochet Blanket Block Pattern
Let’s dive into the pattern!
Key:
Ch Chain
Sc Single Crochet
R Row
St Stitch
(24) in ( ) is total St
Foundation:
Ch 25 (this sets the width of your block).
Row 1:
Start with the 2nd chain from the hook, Sc 24, Ch 1, and turn. (24 stitches total)
Row 2 to Row 28:
- Sc in the first stitch (through both loops).
- Sc in the back loop only for the remainder of the row until you reach the last stitch.
- Sc in the last stitch (through both loops).
- Ch 1 and turn after each row. (24 stitches total)
After Row 2, measure your work—it should be close to 6 inches wide. If it’s too small, start over and add a stitch. If it’s too big, remove a stitch. As long as you’re within ¼ inch, you’re good to go!

Adding a Border:
To give your block a clean and even edge, you’ll crochet around all four sides.
- At the end of Row 28, Ch 1 and Sc evenly down the side of the block, aiming for approximately 26 Sc.
- In the last stitch of the side, Sc 3 in the corner and turn.
- Continue to Sc across the bottom, Sc 3 in the corner, and turn.
- Sc evenly up the other side (26 Sc), Sc 3 in the next corner, and turn.
- Sc across the top and join to the corner stitch.
- Measure your block. If it’s within ¼ inch of 7 inches, you’re done! If not, add another round of single crochet around all four sides.
- Finish off and weave in your tail with a yarn needle.
TIP: If crocheting the sides feels tricky, try using a smaller hook (4mm or 4.5mm) for the border—it can make things easier!

Final Thoughts on the Back Post Single Crochet Blanket Block Pattern
And just like that, you’ve completed a beautifully textured crochet block! This Back Post Single Crochet Blanket Block Pattern is great for creating a blanket full of dimension and character. Plus, the Back Post Only Single Crochet technique makes a perfect addition to the blocks for Step-by-Step: Making A Crochet Blanket With Blocks, So if you haven’t read that yet, go check it out.
Grab your yarn and hook, and start stitching away! Happy crocheting! 🧶✨