Cast on and join in the round

Start by casting on the number of stitches your pattern calls for — usually between 80 and 120 for an adult hat. Use the long-tail cast-on or your preferred method on one of your circular needles. Once all stitches are on the needle, slide them to the center of the cable so they sit evenly around the needle's circumference.

Before you knit the first row, make sure your stitches are not twisted around the needle. Lay the needle flat and check that all cast-on stitches face the same direction toward the center. This matters because a twisted join creates a permanent spiral in your fabric that you cannot fix later.

Knit the first stitch using the working yarn from your ball. This joins the round. You are now working in a circle instead of back and forth in rows. Place a stitch marker on the needle right after this first stitch so you know where each round begins and ends.

Key Takeaways

  • Cast on your stitches on one circular needle, check that they are not twisted, and knit the first stitch to join the round.
  • Work in stockinette stitch (knit every round) or ribbing (alternating knit and purl) depending on your pattern, moving the marker at the start of each round.
  • Decrease stitches evenly across the crown once you reach the height you want, using either a decrease pattern or a decrease round every few rounds.
  • When stitches become too few to fit comfortably on the circular needle, switch to double-pointed needles to finish the crown.
  • Cut the yarn, thread it through the remaining stitches, pull tight, and weave the end into the inside of the hat to find it.

Work the body in your chosen stitch pattern

Most hat patterns use stockinette stitch for the main body, which means you knit every round. This creates a smooth, V-textured fabric that looks the same on both sides. If your pattern calls for ribbing instead — usually 1x1 or 2x2 — you will alternate knit and purl stitches in the same pattern every round.

Move your stitch marker at the beginning of each round so you always know where the round starts. This prevents you from accidentally knitting two stitches together at the join or leaving a gap. Keep your tension consistent as you work around the needle, especially at the join point.

Continue working rounds until the hat reaches the length you want from the cast-on edge. For most adult hats, this is 7 to 8 inches before you start decreasing for the crown. Check the fit by trying the hat on as you go — it is easier to add length than to remove it.

Decrease stitches to shape the crown

Once the body is the right length, you need to decrease stitches to close the top. Most patterns use a decrease round where you reduce stitches evenly around the hat. A common method is to knit 2 stitches together (k2tog) at regular intervals — for example, every 8 stitches, or every 10 stitches, depending on how many stitches you started with.

Work a plain round (no decreases) between decrease rounds, or follow your pattern's instructions. This slows the shaping and prevents the crown from bunching. You will typically work 4 to 6 decrease rounds total, with fewer stitches remaining after each one.

As the number of stitches shrinks, the hat becomes harder to fit around the circular needle. When you have roughly 30 to 40 stitches left, the cable will bunch up and make knitting awkward. This is the time to switch to double-pointed needles.

Switch to double-pointed needles for the final rounds

Divide your remaining stitches evenly across three or four double-pointed needles — if you have 36 stitches, put 12 on each of three needles, leaving one needle free to knit with. Make sure the stitches are not twisted on the double-pointed needles the same way you checked the circular needle at the start.

Knit around using the empty needle, moving the stitch marker as you go. The technique is identical to circular needle knitting; you are straightforward using shorter needles because the circumference is now too small for a circular needle to work comfortably.

Continue decreasing every round or every other round until you have 6 to 8 stitches left. At this point, the crown is nearly closed and the hat is taking shape.

Close the crown and find the yarn

Cut the working yarn, leaving a tail about 6 inches long. Thread the tail through a yarn needle (a blunt needle with a large eye). Pass the needle through each remaining stitch on the double-pointed needles, sliding them off as you go. Pull the yarn tight to gather the stitches and close the hole at the top of the hat.

Weave the yarn tail into the inside of the hat for about an inch, going through the bumps of the stitches. This anchors the end so it does not come loose. Trim any excess yarn close to the fabric.

Turn the hat right-side out if you have been working inside-out (some knitters prefer this), or leave it as is. Try it on. The hat should fit snugly around your head without gaps at the crown.

Finishing touches and common fixes

If your hat has a ribbed cuff, it will naturally curl slightly inward, which is normal and helps it stay on your head. If the body feels loose or the crown bunches, you may have cast on too many stitches or decreased too slowly. Make a note for your next hat.

Some knitters add a pom-pom to the crown by wrapping yarn around a cardboard circle, cutting the loops, and tying the bundle to the top of the hat. Others prefer a clean finish with no embellishment. Both are correct.

Wash the hat in cool water with wool soap if it is made from wool or wool blend, then lay it flat to dry. This relaxes the fibers and can even out any uneven tension from your knitting.

Frequently Asked Questions

What size circular needles do I need?

Use the needle size your pattern specifies, which is usually printed on the yarn label as well. The needle circumference matters less than the needle diameter — a 16-inch circular needle works for most adult hats, but a 24-inch needle also works if you use the magic loop method (bunching stitches in the middle of the cable).

Can I knit a hat on straight needles instead?

Yes, but you will knit flat and seam the sides together at the end. Circular needles are faster because there is no seaming, and the fabric looks more polished. If you only have straight needles, knit the hat as a rectangle, seam it into a tube, then decrease the crown the same way.

My stitches are too tight to move around the needle. What do I do?

Loosen your tension slightly as you work. If the stitches are already on the needle and stuck, use a needle one size larger temporarily to loosen them, then switch back. Tight stitches make the hat stiff and uncomfortable.

How do I know when to start decreasing?

Your pattern will tell you the exact round. If you are improvising, decrease when the hat reaches about 7 to 8 inches from the cast-on edge for an adult. Try it on — the hat should cover your ears and reach just above your eyebrows before you start shaping the crown.

What if I run out of yarn before the hat is finished?

Weave in the old yarn and tie on a new ball using a square knot. Weave both ends into the fabric so the knot does not show. If you are close to the crown, you can finish with a contrasting yarn — a two-tone crown is a design choice, not a mistake.