This post may contain affiliate links. Please see my full disclosure and privacy policy for details.
Add a little lucky charm to your table with this crochet shamrock coaster pattern — a beautifully textured overlay mosaic design worked in flat rows from the right side only. These small square shamrock mug rugs are quick to make, satisfying to stitch, and perfect for St Patrick’s Day decorating — or for adding a subtle Irish touch all year round.
Here you’ll find everything you need to know how to make this crochet shamrock coaster step by step, including materials, stitches, a detailed video tutorial and free written pattern for blog subscribers.
Crochet Shamrock Coaster Pattern Overview
The shamrock motif in these coasters is crisp, bold, and surprisingly easy to create using overlay mosaic crochet — even if you’re newer to the technique. Keep it classic with green and cream, go bold with high contrast mosaic, or soften it with tonal neutrals. Add tassels for a playful finish or keep them minimal and modern.
⭐⭐⭐ Difficulty level: Intermediate – but nice and easy once you get going
💬 Hook Size: 3.5mm
📏 Sizes: Each coaster is approx. 4.25″ by 4.25″
✨ Crochet Technique: Overlay Mosaic Crochet
⚖️ Yarn Weight: Worsted Weight (category 4)
🧶 Yarn Used: Cottage Cotton Yarn
🕐 Approx Crochet Time: 30 mins-1 hour depending on your pace
👍 Perfect For: trying out mosaic crochet and giving as St. Patrick’s Day gifts!
Summarise and Save For Later:
Table of Contents
Things you’ll love about this mosaic crochet coaster pattern
Video Tutorial for the Crochet Shamrock Coaster
Come along as I make this mosaic crochet coaster pattern and see just how easy it is in our step-by-step video tutorial.
Crochet Shamrock Coaster Pattern Materials
- A 3.5mm(E) crochet hook or hook needed to reach coaster size
- Scissors
- Tapestry needle
- Stitch markers
Along with the above you will need the following yarn for your coasters:
Cottage Cotton Yarn, 60% Cotton, 40% Acrylic 207yds/189m/100g in 2 colours. For mine I used Chiffon, Silver Sage and Hilltop.
You will require approximately: 73 metres, 80 yards of each of yarn A and yarn B to crochet the coasters. 1 ball of the recommended yarn A and yarn B.
It’s a category 4, worsted weight yarn which is what gives these baskets their sturdy structure. Find out more about yarn weights and categories.
See my other worsted weight crochet patterns – you might find your next project there too!
Yarn Substitutes
You can use any yarn that you like bearing in mind that you need to make sure you meet the gauge. Some options are:
- Comfy Worsted, Cotton acrylic blend, 109yds/100m/100g
- Dishie, 100% Cotton, 190yds/175m/100g
- Craft Cotton Yarn, 100% Cotton, 115yds/105m/71g
Sizing
Each coaster measures approximately 4.25″ by 4.25″ excluding any tassels you may add.
Are you looking for more mosaic crochet seasonal patterns for your home? I have plenty to keep you busy all year round!
- Happy Hearts Baskets — three nesting sizes for home
- Happy Hearts Coffee Cozy — quick, joyful, and perfect for gifting
- Twinkling Trees Baskets – a festive treat for gifting or keeping
Glossary and Abbreviations
- beg – beginning
- blo – back loop only
- ch(s) – chain(s) (chain stitch tutorial)
- ch-sp(s) – chain space(s)
- rep – repeat
- RS – right side
- sp – space
- ss/sl st – slip stitch (how to crochet a slip stitch)
- st(s) – stitch(es)
- WS – wrong side
- Yoh – yarn over hook
Stitches
The pattern is written in standard US terms and uses the following crochet stitches:
sc – single crochet (how to single crochet stitch)
Mdc – Mosaic double crochet (mosaic double crochet tutorial)
Are you new to mosaic crochet? I promise it’s not as scary as it looks!
If you’ve not tried this technique before, check out this overlay mosaic crochet tutorial to get you started 😊
Special Stitches
SINGLE CROCHET (sc) always worked in back loop only (blo).
Insert hook from front to back through stitch to be worked. Yarn over and pull through stitch. Yarn over and pull through both loops on the hook.
MOSAIC DOUBLE CROCHET (Mdc)
Yarn over and insert hook into front loop of stitch two rounds below. Yarn over and pull through the stitch. Yarn over and pull through two loops on the hook.* Yarn over and pull through remaining two loops on the hook.
The stitch behind the Mdc on the current round is left unworked.
MOSAIC DOUBLE CROCHET 2 TOGETHER (Mdc2tog) – current and next st
Begin working a Mdc in the current st but stop at *. Now begin another Mdc in the next st and complete by yarning over and pulling through all the loops on the hook.
MOSAIC DOUBLE CROCHET 2 TOGETHER (Mdc2tog) – previous and current st
Begin working a Mdc in the previous st but stop at *. Now begin another Mdc in the current st and complete by yarning over and pulling through all the loops on the hook.
2 MOSAIC DOUBLE CROCHET (2Mdc)
Work two mosaic double crochet stitches in the front loop of the stitch 2 rounds below. In the heart motif this helps to shape the sides. It does not increase the stitch count as you will be skipping a stitch either before or after.
Mosaic crochet is such great fun! Check out some more of my mosaic crochet patterns and see just how much you can do with this fun technique!
FOUNDATION SINGLE CROCHET (Fsc)
- Step 1: Ch2, insert hook into second ch from hook, yarn over and pull up a loop. [2 loops on hook]
- Step 2: Yarn over and pull up another loop i.e. ch1. This creates the first “chain” in your foundation row. [still 2 loops on hook]
- Step 3: Yarn over and pull through both loops to complete the first Fsc.
- Step 4: Next stitch and subsequent stitches: Insert hook into “chain” created in Step 2, yarn over and pull up a loop. [2 loops on hook]
- Step 5: Yarn over and pull up another loop i.e. ch1. This creates the next “chain” in your foundation row. [still 2 loops on hook]
- Step 6: Yarn over and pull through both loops to complete the next Fsc.
- Repeat Steps 4, 5 and 6 as required.
How to Crochet a Shamrock Coaster?
- The coasters are made from the bottom up starting with a row of foundation single crochet stitches.
- The body of the coaster is then worked in overlay mosaic crochet rows.
- At the end of each row you will need to break the yarn.
- To start the next row, with the right side facing, join the yarn to the first stitch of the row just worked.
- When complete you can either weave in your ends or create small tassels.
Pattern Gauge: not essential for this project
Making a crochet gauge swatch is important when crocheting projects to ensure that it ends up the desired size.
For small projects like this quick coaster though, it’s not essential so just go for it and adjust you hook size if you need to.
Before you jump into crocheting your crochet cup coasters, take a moment to read through the pattern notes—it’s a game-changer!
These handy insights will not only simplify your pattern-reading journey but also ensure a smoother crochet experience. You’ll find helpful tips on deciphering the sizing, customisation and more.
- The pattern is worked in rows using the overlay mosaic crochet technique for the main body.
- All stitches in the Mosaic Sections are worked as sc in blo or Mdc.
- Each Row uses just one colour.
- A ch1 at the beginning or end of a Row does not count as a stitch.
- Read through the entire pattern before beginning.
- Make sure that you are familiar with all of the stitches in the abbreviations list before you begin.
- Stitch counts are given in [ ] at the end of each row. If no stitch count is given, then the count is the same as the previous row.
- You can either work the entire project from the written pattern or from the chart depending on what you prefer.
Free Shamrock Crochet Coaster Pattern
There are a few options for you to access and enjoy this crochet pattern:
- View the free pattern on the blog – all blog subscribers will be able to view the patterns supported by ads by logging into their Grow account.
- Purchase the individual pattern on Etsy or Ravelry as a beautifully formatted PDF with extra stitch charts, schematic and colour information page and more!
Get this pattern ad free
Get the PDF Pattern
Perfect to print out or use on any device, with added schematic and charts, colour inspiration and stitch tutorials.
Pattern Support
I am delighted to invite you to join the HanJan Crochet Community Facebook Group where we host all pattern support queries and love to see your progress, yarn choices and finished projects!
US Terminology
Throughout the Main Coaster Panel break the yarn at the end of each row. With the RS facing join the next colour of yarn to the first st of the previous row.
If you would like to create tassels then make sure to break the yarn with at least 3 inches tail on each row.
Work all sc in the back loop only throughout the pattern. This is not written within the pattern to save space.
Refer to Mosaic Chart (available in the premium PDF pattern) or use the written instructions as follows.
MAIN BODY
Row 1: A: Using Yarn A, Fsc 21. [21sc]
Row 2: B: ch1, sc in each st.
Row 3: A: ch1, (sc in next st, Mdc in next st); rep from * to last st, sc in last st.
Row 4: B: ch1, sc in each st.
Row 5: A: ch1, sc in next st, Mdc in next 9 sts, sc in next 3 sts, Mdc in next 7 sts, sc in next st.
Row 6: B: ch1, sc in next 10 sts, Mdc2tog over next 2 sts, sc in next 10 sts. [stitch count remains 21]
Row 7: A: ch1, sc in next st, Mdc in next 9 sts, sc in next st, Mdc in next 9 sts, sc in next st.
Row 8: B: ch1, sc in next 10 sts, Mdc in next st, sc in next 10 sts.
Fancy another quick and easy project for your list?!
These 5 crochet Christmas baubles are quick to make and look great on you Christmas tree.
Row 9: A: ch1, sc in next st, Mdc in next 4 sts, sc in next 4 sts, Mdc in next st, sc in next st, Mdc in next st, sc in next 4 sts, Mdc in next 4 sts, sc in next st.
Row 10: B: ch1, sc in next 6 sts, Mdc2tog in previous and next st, Mdc in next 2 sts, sc in next st, Mdc in next st, sc in next st, Mdc in next 2 sts, Mdc2tog over next 2 sts, sc in next 6 sts.
Row 11: A: ch1, sc in next st, Mdc in next 3 sts, Mdc2tog over next 2 sts, sc in next 11 sts, Mdc2tog in previous and next st, Mdc in next 3 sts, sc in next st.
Row 12: B: ch1, sc in next 5 sts, Mdc in next 2 sts, Mdc2tog over next 2 sts, sc in next 2 sts, Mdc in next st, sc in next 2 sts, Mdc2tog in previous and next st, Mdc in next 2 sts, sc in next 5 sts.
Join our community group!
We’ve built an amazing community always ready to help each other. Join today!
Row 13: A: ch1, sc in next st, Mdc in next 4 sts, sc in next 3 sts, Mdc in next st, sc in next 3 sts, Mdc in next st, sc in next 3 sts, Mdc in next 4 sts, sc in next st.
Row 14: B: ch1, sc in next 8 sts, skip next st, 2Mdc in next st, Mdc in next st, 2Mdc in next st, skip next st, sc in next 8 sts.
Row 15: A: ch1, sc in next st, Mdc in next 7 sts, sc in next 5 sts, Mdc in next 7 sts, sc in next st.
Row 16: B: ch1, sc in next 8 sts, Mdc in next 2 sts,
sc in next st, Mdc in next 2 sts, sc in next 8 sts.
Row 17: A: ch1, sc in next st, Mdc in next 7 sts, sc in next 2 sts, Mdc in next st, sc in next 2 sts, Mdc in next 7 sts, sc in next st.
Row 18: B: ch1, sc in each st.
Row 19: A: ch1, (sc in next st, Mdc in next st); rep from * to last st, sc in last st.
To complete your coaster you can either weave in your ends or create small tassels.
I did this by knotting together 3 strands (and one set of 4 strands) at the side of the coaster. Once pulled secure, cut the ends to a matching length.
Block to complete. I found that steam blocking worked best. Enjoy!
Get your free guide!
Subscribe to get your free guide to choosing and combining colours!
Join HanJan and Share Your Crochet With Us!
I’d love to hear from you and see your HanJan Crochet project! Here’s where you can do that:
📌 PIN THIS POST – save it to your Pinterest crochet board so you can come back to it again and make more!
↗️ SHARE – Share your yarn choices, progress pics, and finished projects on Facebook or Instagram (make sure to use the hashtag) #hanjancrochet
🧶 JOIN – Join thousands of amazing crafters in the HanJan Crochet Community Group on Facebook ready to cheer you on!
✉️📩📬 SUBSCRIBE – It’s an honour to be able to create and share my free crochet patterns with you. I’d love to stay connected and send you regular discount codes and free patterns! Please sign up for my subscriber list to get a free gift right now!
Congratulations on crocheting your very own crochet shamrock coaster pattern! 🌟 Now that you’ve crafted this fun project, why stop here? See my other crochet home decor projects, each waiting to be transformed into your next crochet masterpiece.
Ready for your next mosaic crochet pattern? Here are some other overlay mosaic crochet patterns you might like to try next:
- Mosaic Crochet Hat – in child to adult sizes
- Crochet Wine Bottle Holder – perfect for gifting
- Summer Crochet Tote Bag – with clever colour work
