Knit Flat Hat Pattern: Beginner Garter Stitch Beanie in 10 Sizes

I’m sharing a simple, knit flat hat pattern that’s perfect for beginners or those who prefer “mindless” knitting for relaxation. The Beginner Garter Stitch Beanie is available in 10 sizes from newborn through adult large, and its a gender-neutral, one-skein project in every size! Use a self-striping yarn to make vertical “stripes” of garter stitch rows.

This post contains affiliate links. I may receive compensation (at no added cost to you) if you make a purchase using these links. I am a King Cole Brand Ambassador and this post is part of our ongoing collaboration. All opinions and words are my own.

One of my favorite things about being a King Cole Brand Ambassador is getting the chance to try out brand new yarns before they are available to the public. When this lovely skein of King Cole Acorn Aran yarn showed up a few months ago, I knew I wanted to create a fun, one-skein project with it.

This yarn was just released at the beginning of September and is now available in your local yarn shop or online at Wool Warehouse UK. It’s an acrylic and wool blend yarn that is machine washable. Acorn Aran is marled, and it’s also self-striping, so it shines the brightest against a background of simple stitches. And, what could be more simple than garter stitch in knitting?

When I used to teach knitting, I always had students who preferred knitting flat in rows to knitting in the round. These students would love knit flat hat patterns that are knit on straight needles and then seamed. So, I set out to design a pattern that those students would love. I hope you enjoy it, too!

This is the third pattern in the Holiday Stashbusting Knit Along with KAL Corner. Get all the details on this KAL and enter for your chance to win a prize in this blog post.

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Scroll down for the free knitting pattern for the Beginner Garter Stitch Beanie!

If you make your own Beginner Garter Stitch Beanie, I’d love to see it! Share your progress and questions by tagging me on Facebook as @Underground Crafter, Instragram as @ucrafter, or Twitter as @ucrafter. You can also share a picture in the Underground Crafters Facebook group. Sign up for my weekly newsletter and get a coupon code for your choice of one of my premium patterns and private access to my vault of subscriber goodies. Plus, you’ll never miss one of my free patterns again!

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Beginner Garter Stitch Beanie

Knit Flat Hat Pattern by Underground Crafter

This simple, gender-neutral beanie is a beginner-friendly, knit flat hat pattern. Use a self-striping yarn to highlight the garter stitches, which, when assembled, will form vertical “stripes” on the hat. Best of all, it’s a one-skein project!

Finished Sizes

  • Newborn (0-3 Months, 3-6 Months, 6-12 Months, 1-2 Years, 3-5 Years, 6-12 Years, Teen/Adult Small, Adult Medium, Adult Large). Photographed sample is 1-2 Years.
    • Newborn: 12” (30.5 cm) hat circumference x 5” (13 cm) height.
    • 0-3 Months: 15” (38 cm) hat circumference x 6” (15 cm) height.
    • 3-6 Months: 16” (40.5 cm) hat circumference x 6.25” (16 cm) height.
    • 6-12 Months: 17” (43 cm) hat circumference x 6.75” (17 cm) height.
    • 1-2 Years: 18” (45.5 cm) hat circumference x 7” (18 cm) height.
    • 3-5 Years: 19” (48 cm) hat circumference x 7.5” (19 cm) height.
    • 6-12 Years: 20” (51 cm) hat circumference x 8” (20.5 cm) height.
    • Teen/Adult Small: 21” (53.5 cm) hat circumference x 8.25” (21 cm) height.
    • Adult Medium: 22” (56 cm) hat circumference x 8.75” (22.5 cm) height.
    • Adult Large: 23” (58.5 cm) hat circumference x 9” (23 cm) height.


  • King Cole Acorn Aran yarn (80% acrylic/20% wool, 3.5 oz/100 g/216 yd/198 m) in 4953 Cranberry – 1 skein for all sizes, or approximately 60 yd (90 yd, 100 yd, 114 yd, 125 yd, 145 yd, 160 yd, 175 yd, 195 yd, 205 yd)/55 m (82.5 m, 91.5 m, 104 m, 114.5 m, 132.5 m, 146.5 m, 160 m, 178.5 m, 187.5 m) in any medium weight yarn.
  • US Size 8/5 mm straight knitting needles, or size needed to obtain gauge.
  • Yarn needle.


  • 16 sts = 4” (6.5 cm) across in garter stitch (knit every stitch of every row). For best fit, always check your gauge.

Abbreviations Used in This Pattern

  • BO – bind off
  • CO – cast on
  • k – knit
  • p – purl
  • sl – slip stitch knitwise with yarn in back
  • st(s) – stitch(es)

Pattern Notes

Pattern Instructions


  • Leaving a long yarn tail (approximately 12”/30.5 cm) for seaming, CO 20 (24, 25, 27, 28, 30, 32, 33, 35, 36) sts.
  • Row 1: K to last st, p1.
  • Row 2: Sl 1, k to last st, p1.
  • Repeat Row 2 until Rectangle measures approximately 12” (15”, 16”, 17”, 18”, 19”, 20”, 21”, 22”, 23”/30.5 cm (38 cm, 40.5 cm, 43 cm, 45.5 cm, 48 cm, 51 cm, 53.5 cm, 56 cm, 58.5 cm) long.
  • BO in pattern for Row 2.
  • Fasten off with long yarn tail (approximately 18”/45.5 cm) for seaming.

Assembly and Finishing

  • Thread yarn needle with long yarn tail from cast on row. Join short edges (cast on Row to bind off Row) with mattress stitch seam (see video tutorial below).
  • If you can’t see the video tutorial above, click here to watch it on YouTube.
  • Thread yarn needle with long yarn tail from bind off row. Cinch long edge closed (see Pattern Notes).
  • With yarn needle, weave in ends on inside of hat.
© 2021 by Marie Segares (Underground Crafter). This pattern is for personal use only. You may use the pattern to make unlimited items for yourself, for charity, or to give as gifts. You may sell items you personally make by hand from this pattern. Do not violate Marie’s copyright by distributing this pattern or the photos in any form, including but not limited to scanning, photocopying, emailing, or posting on a website or internet discussion group. If you want to share the pattern, point your friends to this link: Thanks for supporting indie designers!

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