How to Wash a Chunky Knit Weighted Blanket

How to Wash a Chunky Knit Weighted Blanket Without Ruining It

A chunky knit weighted blanket is an investment piece, and like any quality textile, it needs the right care to stay beautiful, soft, and structurally sound. The good news: unlike bead-filled weighted blankets that can clump, leak, or break washing machines, knitted weighted blankets are designed for regular cleaning when you follow a few key steps.

This guide covers exactly how to wash your chunky knit weighted blanket safely including prep, machine washing, hand washing, drying, spot cleaning, and the common mistakes that can damage even the highest-quality blanket.

Can You Wash a Knitted Weighted Blanket?

Yes , most quality knitted weighted blankets are machine washable, and many can be safely washed in a standard home washing machine. This is one of the biggest advantages of bead-free knit construction. Without glass beads or plastic pellets to worry about, there's nothing to clump, leak, or shift during the wash cycle.

That said, a chunky knit weighted blanket is still a heavy textile that needs the right wash setting, the right temperature, and the right drying method. Get those three things right and your blanket will look new for years.

Before you do anything else, check the care label on your specific blanket. Different brands use different yarn constructions, and your blanket's label is the final word on what's safe.

Before You Wash: Important Prep Steps

A few minutes of preparation makes the difference between a clean blanket and a damaged one.

1. Check Your Washing Machine's Capacity

This is the most important prep step. A 15 lb blanket needs a washer that can comfortably handle 15+ lbs of wet laundry. A 20 lb blanket needs a larger-capacity machine. If your washer is rated for less, take the blanket to a laundromat with commercial-grade machines.

Front-loading washers and high-capacity top-loaders without center agitators are the safest options. Older top-loaders with center agitators can stretch or snag the knit, so avoid those if possible.

2. Shake Out Debris

Take the blanket outside or to an open space and give it a firm shake to release loose dust, hair, lint, or crumbs. This prevents that debris from grinding into the fibers during washing.

3. Pre-Treat Any Stains

For visible stains, gently dab a small amount of mild detergent directly onto the spot. Let it sit for 5–10 minutes before washing. Don't scrub aggressively knit fibers can stretch or pill if you scrub too hard.

4. Choose the Right Detergent

Use a gentle, liquid detergent without bleach or fabric softener. Powder detergents can leave residue in the dense knit loops. Fabric softeners coat the fibers and reduce the natural breathability of cotton which is the whole reason you bought a breathable blanket in the first place.

How to Machine Wash a Knitted Weighted Blanket (Step by Step)

Wash alone. Don't mix the blanket with other laundry. It's heavy enough on its own, and other items can tangle in the knit loops or rub against the fibers.
Use cold water. Cold water protects the cotton fibers, prevents shrinkage, and preserves color. Hot water can damage natural cotton over time, especially with heavier blankets that take longer to fully dry.
Select a delicate or gentle cycle. We recommend washing the BloomKnit™ in the cotton bag provided to protect the knitted structure and maintain the quality in the long term. The slower agitation reduces friction on the knit. Avoid heavy-duty or regular cycles.
Add a small amount of mild liquid detergent. Less is more, a heavy soap load is hard to fully rinse out of dense knit construction.
Skip the fabric softener. It coats the fibers and reduces breathability. Skip optical brighteners and bleach as well.
Run an extra rinse cycle if available. Dense knits can hold onto detergent. An extra rinse ensures no soap residue remains in the fibers.
For a particularly thorough cleaning, we recommend professional dry cleaning. This way, your BloomKnit™ weighted blanket will remain wonderfully soft and retain its best shape even after many naps.

How to Hand Wash (If Needed)

If your blanket is too heavy for your washing machine, or if your care label specifies hand washing only, here's the safe approach:

Fill a clean bathtub with cool water and a small amount of mild liquid detergent.
Submerge the blanket fully and let it soak for 15–20 minutes.
Gently agitate the water with your hands — don't twist, wring, or scrub the blanket itself.
Drain the tub and refill with clean cool water to rinse. Repeat the rinse until the water runs clear.
Press down on the blanket to release excess water. Do not wring or twist, this stretches and distorts the knit.

Hand washing a 15+ lb blanket is genuinely demanding work, so most people prefer machine washing in a properly sized machine when it's an option.

How to Dry a Chunky Knit Weighted Blanket

Drying is where most weighted blankets get damaged usually from heat or from hanging the blanket while it's still saturated.

Best Option: Lay Flat to Dry

This is the safest and most recommended method for chunky knit cotton blankets. Lay the blanket flat on a clean, dry surface, a guest bed, a clean floor with towels underneath, or a large drying rack designed for sweaters. Reshape it gently to its original dimensions while it's wet.

Drying time will vary based on humidity and blanket weight, but expect 24–48 hours for full drying. Flip the blanket halfway through and replace any saturated towels underneath.

Acceptable Option: Tumble Dry on Low

If you need faster drying, you can tumble dry on the lowest heat setting in short cycles. Run the dryer for 20–30 minutes at a time, then check progress. Add wool dryer balls to help the blanket move freely and dry more evenly.

Important: ensure your dryer can handle the blanket's weight. Most residential dryers handle up to about 20 lbs of wet laundry, but a soaked 20 lb blanket will weigh significantly more. If you're not sure, lay flat instead.

Avoid: Hanging While Wet

Never hang a wet chunky knit weighted blanket on a clothesline, hanger, or drying rack. The water weight will stretch the knit out of shape, sometimes permanently. Always reshape and dry flat, or tumble dry on low.

Avoid: High Heat

High dryer heat damages cotton fibers, causes shrinkage, and can break down the structural integrity of the knit. If you tumble dry, low heat only.

How to Spot Clean

For small spills or marks, spot cleaning is faster than washing the whole blanket and easier on the fibers.

Blot (don't rub) the spill immediately with a clean dry cloth to absorb as much liquid as possible.
Mix a small amount of mild liquid detergent with cool water.
Dampen a clean cloth with the solution and gently dab the stain, working from the outside in to prevent spreading.
Rinse the area by dabbing with a separate clean cloth dampened in plain cool water.
Press a dry towel onto the area to absorb moisture.
Let the spot air dry completely before folding or storing the blanket.

How Often Should You Wash It?

For a chunky knit weighted blanket used regularly on a bed, washing every 4–6 weeks is reasonable. For a blanket used only occasionally on a couch, every 2–3 months is fine.

Some practical guidelines:

Wash sooner if you've been sick, sweating heavily, or if a pet has been on the blanket
Spot clean small marks rather than washing the entire blanket every time
Air the blanket out regularly by laying it flat in a well-ventilated room or outdoors in indirect sunlight, this freshens the fibers between washes

Over-washing is genuinely a thing. Every wash cycle puts some wear on the fibers, so washing too frequently shortens the blanket's lifespan unnecessarily.

Common Mistakes to Avoid

The fastest ways to damage a knitted weighted blanket:

Hot water. Causes shrinkage, fades color, and weakens cotton fibers.
Bleach. Breaks down fibers and ruins natural cotton.
Fabric softener. Coats the knit and destroys the breathability that makes cotton blankets cool.
High dryer heat. Shrinks cotton, weakens stitching, and reduces blanket lifespan.
Wringing or twisting when wet. Permanently stretches and distorts the knit.
Hanging wet. Same problem — the water weight pulls the knit out of shape.
Overloading a small washer. Damages both the blanket and the machine.
Mixing with other laundry. Tangles, snags, and uneven washing.

How to Store Your Knitted Weighted Blanket

Proper storage between seasons keeps your blanket fresh and prevents musty odors or damage.

Make sure the blanket is completely dry before storing — even slight moisture can cause mildew
Fold loosely rather than tightly compressed, over-compression can leave permanent creases
Store in a breathable cotton storage bag or a cool, dry linen closet, never sealed plastic bags, which trap humidity
Avoid direct sunlight during storage, which can fade colors over time
Add a cedar block or lavender sachet to deter moths if you store in a less-trafficked area

Frequently Asked Questions

Can I dry clean a knitted weighted blanket?

Most 100% cotton knit weighted blankets don't require dry cleaning, and the chemicals can leave residue in dense knit loops. Machine washing in cold water is gentler and more effective.

What if my blanket smells musty after washing?

Musty smells usually mean the blanket didn't dry fully or fast enough. Re-wash with an extra rinse cycle, then dry more aggressively, either tumble dry on low for longer with dryer balls, or lay flat in a well-ventilated room with a fan circulating air.

Will my blanket shrink in the wash?

Quality cotton blankets are typically pre-shrunk, but using cold water and low or no heat for drying is the best protection against shrinkage. Hot water and high dryer heat are the main shrinkage culprits.

Can I take my weighted blanket to a laundromat?

Yes — for heavier blankets (20 lb and up), a laundromat with commercial-capacity, front-loading washers is often the best option. Just use cold water, gentle cycle, and mild detergent.

My blanket got a snag — can I fix it?

Small snags can usually be gently coaxed back into the knit with your fingers. Don't cut a snag , pulling the yarn through to the back side and gently tugging the surrounding stitches will often restore the appearance.

The Short Version

Cold water, gentle cycle, mild liquid detergent, no fabric softener, no bleach, no high heat. Wash alone. Dry flat or tumble on low. Store dry, loose, and breathable.

Follow those rules and your knitted weighted blanket will look beautiful and perform at its best for years. The big advantage of choosing a quality cotton knit weighted blanket, like our BloomKnit™ is that it's actually designed to be cared for. No glass beads to worry about, no synthetic shell to fall apart, just well-made cotton that responds well to thoughtful care.

Browse our BloomKnit™ collection if you're still shopping for the right weighted blanket or check out our complete guide to chunky knit weighted blankets for everything else you need to know.