What Causes Tight Knitting Cast On Stitches
Usually, this problem is created when you tug too hard on your working yarn as you place the new stitches onto your needle. It’s an especially common problem with the long tail cast on and variations on it. That’s because you are holding both ends of the yarn in your left hand. When you cast on that way, it can often result in a tight yank at the end when you twist your stitches onto the needle.
Fix one: work your knitting cast on over two needles
Casting on over two needles helps loosen up the stitches in your cast on. This option is particularly popular among sock knitters. If you find you are tugging your yarn really hard while casting on and pulling stitches too snug, using two needles instead of just one will make the stitches a little larger.
Casting on with a larger needle is a great option if you are needing using thicker yarn and needles that match, generally US size 4 (3.5 mm) and up. In this situation, casting on over two needles will result in a stitch that is too large and floppy. Instead, try going up one or two needle sizes for your cast on.
Fix two: cast on using a larger needle
Fix three: pay close attention to your surroundings
I know that when I am stressed or worried, I tend to have a tighter tension. If I notice I'm feeling this way, I intentionally make an effort to relax my hands and loosen my stitches. That means I pay close attention to how tightly I’m tugging my working yarn after each new stitch.