How to Dry a Pillow After Washing (Without Lumps)

By Maya Ellis 9 min read

To dry a pillow without lumps, dry it on low or no heat, add a few dryer balls to break up clumps, and keep going until the inside is completely dry. A pillow that feels dry on the surface can still be damp at the core, and that trapped moisture is what causes both lumps and a musty, mildewy smell. Below is how to dry every common fill type the right way, plus a simple press test to confirm it is dry all the way through.

Key takeaways

Preventing post-wash clumping and mildew requires low heat, 2 to 3 wool dryer balls, and passing the 5-second center press test before making the bed:

Most pillows can go in the dryer on low heat; high heat melts foam and scorches synthetic fills.
Dryer balls (or clean tennis balls) keep fill from clumping as it tumbles.
Drying time runs from about 1 hour for some fills to 24–48 hours when air-drying down.
Use the press test to check the center before you put the pillow back on your bed.
A pillow stored even slightly damp can grow mildew, so dry it fully first.
The Pillowash Crisp pillow has an open core that lets water drain through, so it dries faster than sealed foam.

Can you put a pillow in the dryer?

Yes, most pillows can go in the dryer, but you should use low heat or the air-dry (no heat) setting, not high. High heat is the main thing that ruins pillows: it can melt or break down foam, scorch polyester fill, and damage the down clusters in feather pillows. Always check the care label first, since a few pillows are air-dry only.

Low, steady warmth with plenty of tumbling is what you want. The tumbling is what redistributes the fill and stops it from drying into one hard clump on one side. If you are unsure whether your specific pillow is dryer-safe at all, our guide on dryer safety for pillows walks through it by type.

How do you dry a pillow in the dryer without lumps?

Lumps form when wet fill clumps together and then dries in that shape. The fix is to keep the fill moving and dry it slowly. Here is the method that works for most washable pillows:

Squeeze out extra water first. Press the pillow between two clean dry towels. Do not wring or twist it, which can knot the fill.
Set the dryer to low or air-dry. Skip high heat completely.
Add 2–3 dryer balls (or clean tennis balls). They bounce around and break up clumps as the pillow tumbles.
Run the dryer in cycles. Stop every 20–30 minutes, take the pillow out, and fluff and reshape it by hand.
Repeat until the center is dry. Surface-dry is not done; the inside takes the longest.

That fluff-and-reshape step between cycles is the real secret to a lump-free result. It does the work your hands would normally do, just more often.

Dryer balls vs. tennis balls: which is better?

Both work, and they do the same job: they bounce through the load and break up clumping fill. Wool dryer balls are made for this, last for 2 to 3 years, and run quiet.

Clean tennis balls are a fine stand-in if that is what you have, though they can be louder and the rubber smell sometimes transfers to the pillow. If you go with tennis balls, use ones that are clean and odor-free, and consider tucking each into a clean sock.

How do you air-dry a pillow without a dryer?

You can air-dry almost any pillow; it just takes longer and needs good airflow. Lay the pillow flat on a drying rack or a clean, breathable surface in a well-ventilated spot, and turn and fluff it every few hours so it dries evenly instead of clumping. The Sleep Foundation notes that air-drying can take 24 to 48 hours for down and feather pillows, so plan ahead and have a spare pillow ready.

A few things that speed it up: dry it near a fan or open window, rotate it often, and avoid drying it folded or stacked, where moisture gets trapped in the middle. Direct, all-day sun can yellow some fabrics, so dappled light or a breezy shaded spot is usually safer for the cover.

How long does it take to dry a pillow?

Drying time depends almost entirely on the fill. Dense, sealed fills like solid memory foam hold water and take the longest; open or fiber fills dry faster. Here is a general guide for full drying, not just surface-dry:

Fill type	Dryer (low heat)	Air-dry	Notes
Down / feather	2–3 hours, in cycles	24–48 hours	Use dryer balls; fluff often to restore loft
Polyester / down-alternative	1–2 hours	12–24 hours	Dries fairly quickly; reshape between cycles
Solid memory foam	Air-dry only	24+ hours	Holds water; never machine-dry, never high heat
Shredded foam	Low, in cycles	12–24 hours	Clumps easily; fluff often
Open-structure washable (e.g., Pillowash Crisp)	Tumble dry low	Faster than sealed foam	Water drains through the core; springs back into shape

These are ranges, not promises. Humidity, room temperature, and how much water you squeezed out first all change the real number. The honest answer is to stop watching the clock and use the press test instead.

How can you tell a pillow is fully dry inside?

Use the press test: fold the pillow in half, press hard on the center, and hold for a 5 to 10 seconds. If you feel any coolness, dampness, or a heavy spot, the inside is still wet and needs more time. A fully dry pillow feels light, springs back evenly, and is the same temperature throughout. A damp pocket usually feels cooler and slightly heavier than the rest.

Two more quick checks: a dry pillow has no clumps when you squeeze it, and it has no musty smell. If you catch a faint odor, that is moisture, not a cleaning problem, and the pillow needs to keep drying. We cover that further in our piece on a musty smell after washing.

Why does a damp pillow grow mildew?

Mildew can colonize damp fill within 24 to 48 hours because mold spores need moisture, and a damp pillow gives them exactly that in a warm, dark, enclosed space. When you put a still-damp pillow back in a pillowcase or store it in a closet, the trapped moisture has nowhere to go.

The Sleep Foundation advises making sure a pillow is completely dry before using or storing it, because lingering moisture can lead to mold or mildew. This is also why "good enough" drying causes that sour, musty smell a day or two later.

The takeaway is simple: it is always better to over-dry than to put a slightly damp pillow back on your bed. A few extra cycles cost you time; a mildewed pillow usually has to be thrown out.

Does heat from drying kill dust mites?

Yes, sustained heat helps. According to the Mayo Clinic, washing bedding in hot water of at least 130°F (54°C) kills dust mites, and if an item cannot be washed hot, running it in the dryer for at least 15 minutes at a temperature above 130°F also kills them.

That is a useful reason to finish a wash with a proper dry rather than leaving a pillow to air out halfway. For care that involves higher wash temperatures, always follow the pillow's own care label so you do not damage the fill.

How does the Pillowash Crisp dry differently?

Most conventional pillows hold water inside dense batting for 12 to 36 hours. The Pillowash Crisp pillow was built the other way around.

Its core uses an open structure that lets water flow straight through instead of soaking it up, so it drains and dries faster than sealed foam, and it springs back into shape rather than drying into lumps. The Breath-Real™ airflow design is what lets air and water move through the core so freely.

Drying is simple: tumble dry on low or air-dry, and you can remove the inner cover to speed up air-drying. Wash the outer cover separately and dry it on low (no hotter than 50°C). Because the whole pillow is made to be washed, you are not fighting a fill that traps water in the middle. If a pillow that actually dries fast and reshapes itself sounds better than your current one, here is the fully washable Pillowash Crisp pillow.

Frequently asked questions

Can you dry a pillow on high heat to save time?

No. High heat is the most common way pillows get ruined: it can melt foam, scorch synthetic fill, and break down down clusters. Low or no heat takes longer but protects the pillow, and dryer balls plus regular fluffing make up for the slower pace.

Should you wash a pillow before drying it the right way?

Drying is only half the job. How you wash a pillow affects how easily it dries and whether it lumps, so it is worth getting both steps right. See our full guide on how to wash a pillow in the washing machine for the wash side.

How often should you wash and dry your pillows?

Most pillows benefit from a wash every 4 to 6 months, with pillowcases washed weekly. If you wash and dry the pillow itself fully each time, you avoid the moisture buildup that causes odor and mildew between washes.

What do you do if your pillow still has lumps after drying?

Lumps usually mean it dried unevenly or with damp pockets. Put it back in the dryer on low with a couple of dryer balls, stop every 20 minutes to break up clumps by hand, and run it until the press test comes back fully dry. Reshaping while it is still slightly warm is easier than reshaping it cold.

By Maya Ellis. Last updated June 2026.

Skip 3-day drying marathons and clumped fill: run our 30-second Pillow Health Check, read Breath-Real™ airflow answers in the Pillowash Care FAQ, or shop the Pillowash Crisp Washable Pillow: