How to Crochet a 97-Inch Multicolor Granny Square Blanket

Planning Your Multicolor Granny Square Blanket

So, you’ve decided to take on the beast. Ninety-seven inches? One hundred twelve colors? That’s not just a blanket; that’s a legacy project. Before I let you dive into the yarn stash, let’s talk about what actually makes this thing survive the wash cycle and look decent when it’s done.

Choosing Your Yarn and Color Palette

First things first: don’t buy every color in the rainbow if they’re all different weights or fibers. I learned that the hard way back in the early 2000s with a shawl that pilled worse than my grandpa’s sweater. For a blanket this size, consistency is key. I stuck to a cotton-acrylic blend—something sturdy enough to hold its shape but soft enough to cuddle. Specifically, I used a worsted weight (Category 4) because it moves fast but still shows off those lovely color transitions.

When I started, I bought a massive multipack of 20 coordinating shades. But 112 colors? Good luck finding a single brand that has that many distinct, cohesive hues. I had to hunt down singles from various indie dyers and big-box store clearance bins. Here’s the trick for dealing with backorders or discontinued dyes: don’t panic. If your favorite shade of “Sunset Orange” is gone, look at the undertones. Is it red-based? Blue-based? Find a substitute with the same base note. Also, order early. Seriously. If you see a color you like, buy three skeins. Not two. Three. Because yarn has a mind of its own, and dye lots will vary.

Designing a Custom Granny Square Pattern

Now, let’s talk design. Most granny square tutorials tell you to stop at four rounds. But if you want a 9.5-inch square, you need to scale up. I didn’t start with a rigid pattern; I started with a sample block. I crocheted round by round, changing colors with every round to test how the tension held up.

Here’s the math bit I skipped in my early days (and regretted): a standard granny square grows based on corner spaces. To get to 9.5 inches, I needed roughly 6 to 7 rounds depending on my tension. I used skeins to designate colors for each round. As I finished Round 1, I placed that small center circle onto a new skein of yarn designated for Round 2. This kept my workflow moving without tangling everything into a knot. It sounds chaotic, but it’s actually the most organized way to handle multi-colored blocks.

Crocheting the Squares: Managing Color Changes and Consistency

Making 112 squares is a marathon, not a sprint. The biggest killer of progress here isn’t skill; it’s organization.

Organizing Your Color Workflow

I used a system I call the “Skein Chair.” Once I finished the center (Round 1) of a new square, I slipped that little disc onto a spare skein of yarn that was already wound for Round 2. I repeated this for Rounds 3, 4, and so on. Each square sat in a stack of nested skeins, looking like a weird, colorful totem pole. When I was ready to start Round 2 on any given square, I just picked up the next available totem.

For tracking, I kept a simple spreadsheet. Columns for Square ID, Completed Rounds, and Yarn Lot Numbers. I also used color-coded bobbins for the active rounds. If you’re using more than five colors per square, you need bobbins. Leaving loops on your hook while you switch colors is a recipe for lost yarn and angry knots later. Pro tip: Keep your working yarn in a separate bowl from your “waiting” yarn. It prevents accidental grabs that lead to unraveling.

Achieving Uniform Tension Across 112 Colors

Different yarns behave differently. Even if they’re both Category 4, a 100% cotton strand will behave very differently from an acrylic one. My advice? Swatch, but don’t obsess. Since we’re blocking anyway, slight tension differences won’t matter much—yet. However, keep your hook size consistent. I used a US J/10 (6mm) hook throughout. If your hands cramp, switch to a larger hook, but be aware that the final square size will change.

If you notice one color pulling tighter than others, it might be the fiber’s natural elasticity. Don’t fight it too hard during crochet; trust the blocker to even it out later. Just ensure you aren’t tightening your knots after every color change. Loose is better than tight here. You’ll thank me when you’re trying to push that bulky end through a tapestry needle.

Blocking Large Squares to Exact Dimensions

This is where the magic happens. Crochet squares come out of your hands looking like distorted circles or lopsided diamonds. Blocking forces them into submission.

Setting Up a Blocking Station

I built a dedicated blocking table using interlocking foam puzzle mats (the kind you use for playrooms, but the thick, high-density kind). I drew a grid on them with permanent marker, marking every inch. My target was 9.5 inches square, so I pinned the corners at the 9.5-inch marks. Having a grid saves you from measuring every single square with a ruler, which takes forever.

Tools of the trade: T-pins (rust-proof, please! Rust stains are a nightmare) and blocking combs. The combs are essential. They hold the sides straight while you pin. Without them, your square might stretch unevenly, leaving one side longer than the other. If you don’t have foam mats, a thick wool towel works, but it’s harder to pin securely.

Blocking Techniques for Granny Squares

I prefer wet blocking for natural fibers like cotton, and steam blocking for acrylics. Since I mixed blends, I played it safe with steam, using a heavy-duty iron held slightly above the fabric. Never let the iron touch the yarn directly; it can melt synthetic fibers or shine them up unpleasantly.

Here’s the drill: Pin the four corners first. Pull them until they hit your 9.5-inch mark on the grid. Then, use the blocking comb along each side, pinning every few inches to keep the edges perfectly straight. Check your diagonals. If both diagonals are equal length, your square is truly square. If not, tweak the pins. Let them dry completely—usually 24 hours in a humid climate—before unpinning. Rushing this step results in wavy edges, which ruins the join later.

Joining Squares with a Flat Slip Stitch and Adding a Border

Okay, 112 squares are blocked. Now we have to put them together without creating a bumpy mess.

Flat Slip Stitch Join: A Seamless Method

I used the flat slip stitch join. It looks like a single chain across the top of your work, which is perfect for granny squares. Here’s how: Hold two squares right sides together. Insert your hook into the front loop of the corner space of the bottom square, then through the front loop of the corresponding corner space of the top square. Yarn over and pull up a loop. Repeat for the next set of loops across the row.

The key is consistency. Insert hook, pull up, yarn over, pull through two loops on hook. Do this for every single stitch along the edge. It creates a flatter, less bulky seam than the standard whip stitch. It also helps hide minor size discrepancies between squares.

Creating a Border That Squares Off Circles and Tightens Edges

Even with blocking, granny squares tend to bow out at the sides. To fix this, I added a structured border. First, I worked a round of V-stitches (double crochet, chain 1, double crochet) in the same space across the entire perimeter. This smoothed out the jagged edges.

Next came the “squaring off” round. In the chain-1 spaces of the previous round, I worked corner clusters (3 dc, ch 2, 3 dc) and side groups (dc, ch 1, dc). This forced the curved edges to straighten.

Then, I worked two rounds of traditional granny clusters. Crucially, I worked these clusters into the joining seams. This locked the squares together and prevented any shifting. Finally, I did one round of Half Double Crochet (HDC) with slight decreases in the middle of each square side to cinch in any remaining bowing, followed by one final round of HDC without decreases to seal the edge. This border gives the blanket a crisp, finished look that hides the inherent roundness of granny squares.

Final Assembly and Finishing Touches

You’re almost there. The blanket is joined, bordered, and looking glorious. But don’t skip the details.

Weaving in Ends and Handling Color Changes

With 112 colors, you have hundreds of ends. Do not weave them in after you finish the whole blanket. Weave as you go. Use a blunt tapestry needle to weave ends into the back of the work, following the path of the existing yarn strands for about 3-4 inches. This distributes the tension and prevents bulging. If you have tiny ends from short color segments, trim them close to the fabric rather than weaving them deep, as thick knots can show through.

Measuring and Adjusting the Final Blanket

Measure your finished blanket. Mine came in exactly at 97x97 inches. If yours is slightly smaller due to tension variances, you can add a final border round to even it out. Check the corners—are they sharp 90-degree angles? If not, tweak your border counts on the next make.

Care instructions: Because I used a mix of cotton and acrylic, I recommend machine washing on cold, gentle cycle, and laying flat to dry. Do not tumble dry; heat can shrink the cotton components and felt the acrylic, altering the size dramatically. With proper care, this blanket will outlive us all. Happy crocheting!