
The September square in our House Blanket Crochet-Along is here, and it’s all about capturing the magic of late summer and early fall with this playful Treehouse square!
This design features a little ladder leading up to a treehouse nestled in a lush green tree, set against a golden-yellow backdrop. Perfect for evoking the nostalgia of backyard adventures. I can almost picture kids building forts, climbing trees, or camping out in their very own treehouse as the leaves start to change.

For this square, I’m using Red Heart Super Saver in Cornmeal (background), Spring Green (leaves), Coffee (tree trunk), Cafe Latte (roof, door, ladder), and Buff Beige (house), which bring the treehouse and its leafy surroundings to life. These rich, natural tones complement the other squares beautifully and give a warm, autumnal feel.
This is the 9th square in our CAL, with only three more to go! You can always skip ahead and work on the October Haunted House and Christmas Gingerbread House squares. But keep in mind I will be reposting those with a more detail during their respective months.

What is the House Blanket CAL?
Each month in 2025, I will be posting a House themed corner-to-corner crochet square. Each house will reflect the seasons and/or holidays! At the end of the year I will stitch all 12 of the house squares together to make a stunning blanket of happy homes.
The links to all the patterns in this project will be available in one spot on the
>>> House Blanket Landing Page <<<

Each square starts with a 25×25 pixel graph. I use the corner-to-corner technique to crochet the square and the finished size of the crocheted squares are approximately 17 x 17 inches.
If you are new to the Corner-to-Corner (C2C) Crochet technique, let me explain a little bit about it. You can take a pixel graph and turn it into a crocheted piece. By starting in one corner of the graph (the lower right hand is most common place to start), you will crochet diagonally in rows until you get to the other corner. One pixel square = a chain 2 + 3 HDC stitches. Please note that I am using HDC stitches for the C2C instead of DC.
Before you get started, below is a Corner-to-Corner Video Tutorial if you need some help with the technique:
Materials:
– Red Heart Super Saver in Cornmeal (background), Spring Green (leaves), Coffee (tree trunk), Cafe Latte (roof, door, ladder), and Buff Beige (house), and bit of light blue (or white or even the cornmeal) for the window.
>>> You can stock up on all shades of Red Heart Super Saver yarn HERE on Yarnspirations.com <<<
– Size H Crochet Hook
>>> Treehouse Pixel Graph. Download it HERE for free <<<
>>> Treehouse Written Instructions. Download the FREE PDF HERE <<<
>>> Treehouse Color Block Instructions. Download the FREE PDF HERE <<<

The links above are the free instructions to make your c2c square. Follow the pixel graph, the written instructions, or the color blocks. Be sure to share your house squares on social media using the hashtag #2025HouseBlanket and #HouseBlanketCAL

TIP: Wind up small balls of yellow and brown yarn before you start. It will help when changing colors. The first half of the treehouse is the most tedious. Especially the ladder. Beyond that it’s smooth sailing!

All of the house squares are reversible! The back is a mirror images as you can see in the picture below.

Not a fan of corner-to-corner crochet?
You can find the Single Crochet version of all the squares HERE.
If you missed the first six squares you can get it here:
January House Blanket Square: Winter Cabin
February House Blanket Square: Birdhouse
March House Blanket Square: Castle
April House Blanket Square: Barn
May House Blanket Square: Camper Van
June House Blanket Square: Beach House
July House Blanket Square: Lighthouse
August House Blanket Square: School House
>>> House Blanket Landing Page <<<
>>> Single Crochet House Blanket Patterns <<<
Skip ahead and make the October Haunted House and Christmas Gingerbread House Squares as well! That way you won’t be panicked to finish this blanket over the holidays.
Speaking of treehouses, did I ever show you the one my husband built during COVID? It was such a special project and a beloved addition to our backyard, full of memories and fun. Unfortunately, the HOA made us take it down, which still stings! You can see the project here: DIY Backyard Treehouse. That little treehouse will always live in our hearts and now it lives on in this square!

I hope you enjoy creating this Treehouse square as much as I enjoyed designing it. It’s a playful and cheerful way to welcome September and the start of the fall season into your blanket!
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I really love how creative and cozy the Treehouse House Blanket CAL Square 9 design looks! The step-by-step details make it so easy to follow, and it’s inspiring for anyone who enjoys crocheting. For those interested in creating a comfortable home environment, don’t forget to visit my website On & Sys Home for the best options in Air Conditioner in Qatar to keep your space cool and relaxing: https://onandsyshome.com/
This Treehouse square is such a beautiful tribute to late summer and childhood adventures! It reminds me of the joy of playing outdoors — and also why keeping those outdoor and indoor spaces pest-free is so important this time of year.
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Such a beautiful tree house pattern! I’ve started sharing short crochet & amigurumi tutorials on YouTube too — here’s my channel
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