How To Store Winter Coats Properly To Prevent Moths And Mildew

Winter coats are significant investments—both in cost and comfort. From down-filled parkas to wool overcoats, these garments protect us through the coldest months. But when spring arrives, improper storage can undo all their value. Moths feast on natural fibers, while dampness breeds mildew that weakens fabric and leaves stubborn odors. The good news: with the right approach, you can store your winter coats safely, keeping them fresh, clean, and ready for next season.

Clean Before You Store

Storing a coat without cleaning it first is one of the most common mistakes. Residual sweat, skin oils, food stains, or perfume residue may seem minor, but they attract pests like moths and provide nutrients for mold spores. Even if a coat looks clean, microscopic organic matter remains embedded in the fibers.

Always clean your winter coat according to its care label. This means either dry cleaning, hand washing, or machine washing—depending on the material. Down jackets often require special detergent and low-heat tumble drying with tennis balls to restore loft. Wool coats typically need professional dry cleaning to avoid shrinkage.

Tip: Never store a coat that still carries the scent of smoke, cooking, or body odor—these smells linger and increase pest attraction.

Drying Is Just as Important as Washing

After washing, ensure your coat is 100% dry before packing it away. Trapped moisture is the leading cause of mildew growth in stored clothing. Air-dry coats in a well-ventilated area away from direct sunlight, which can fade colors and weaken fibers. For thick coats, this may take 24–48 hours. Use a fan to circulate air if needed, but avoid high heat sources.

If using a dryer, choose the lowest heat setting and check frequently. Overheating can damage insulation, melt synthetic linings, or shrink wool. Once dry, hang the coat and inspect seams and lining for any lingering dampness.

Choose the Right Storage Location

The ideal storage space is cool, dark, and dry—with stable temperature and humidity levels. Avoid attics, basements, and garages unless they are climate-controlled. These areas are prone to temperature swings, high humidity, and pest infestations.

A bedroom closet, linen cupboard, or interior wardrobe shelf is often best. These spaces are usually more stable and less exposed to outdoor elements. Keep coats away from exterior walls, which may develop condensation during seasonal shifts.

“Moths thrive in dark, undisturbed environments with access to natural fibers. Preventing infestation starts with disrupting their preferred habitat.” — Dr. Laura Bennett, Entomologist & Textile Preservation Specialist

Humidity Control Matters

Mildew grows when relative humidity exceeds 60%. In humid climates, even indoor closets can become breeding grounds. Use a hygrometer to monitor humidity levels. If readings consistently exceed 60%, consider adding a small dehumidifier or moisture-absorbing packets.

Silica gel packs are effective and reusable. Place several inside pockets or zippered compartments. Alternatively, use breathable cotton sachets filled with activated charcoal or baking soda to absorb both moisture and odors.

Use Breathable Storage Solutions

Never store winter coats in plastic bags or sealed containers. While they may seem protective, non-porous materials trap residual moisture and restrict airflow, creating a perfect environment for mildew. Plastic also emits fumes over time that can degrade fabric coatings, especially on technical outerwear.

Instead, use breathable garment bags made from cotton or canvas. These allow air circulation while shielding against dust and light. Ensure the bag is large enough to avoid compressing the coat, especially down or padded styles that rely on loft for insulation.

Storage Method	Pros	Cons
Plastic Bin (with lid)	Pest-resistant, stackable	Traps moisture; not breathable
Cardboard Box	Breathable, recyclable	Attracts silverfish; collapses when damp
Cotton Garment Bag	Airflow, dust protection	Not rodent-proof; allows moth access
Vented Plastic Storage Bin	Durable, transparent, some airflow	Still risks condensation if not monitored

For long-term storage, consider using a ventilated plastic bin with small perforations. Line the bottom with acid-free tissue paper to wick minor moisture and protect delicate trims. Avoid stacking heavy items on top of stored coats to maintain shape and prevent compression damage.

Protect Against Moths Naturally

Moths target natural fibers such as wool, cashmere, fur, and feathers. Their larvae feed on keratin found in animal-based textiles. Synthetic blends are less attractive but not immune—especially if blended with wool or soiled.

Chemical mothballs contain naphthalene or paradichlorobenzene, which are effective but toxic and leave strong odors. Safer alternatives include cedar, lavender, and diatomaceous earth.

• Cedar blocks or rings: Release aromatic oils that repel moths. Hang them inside garment bags or place in storage boxes. Re-sand or refresh every 3–6 months to renew scent.
• Lavender sachets: Pleasant-smelling and naturally insect-repellent. Combine dried lavender with rosemary or mint for enhanced effect.
• Diatomaceous earth (food-grade): Sprinkle lightly along shelves or in corners—not directly on fabric. It dehydrates insects but is safe for humans when used properly.

Tip: Freeze suspect garments for 48 hours before storage to kill hidden moth eggs. Place in sealed cotton bags to prevent moisture absorption during freezing.

Regular Inspection Schedule

Even the best-prepared storage isn’t foolproof. Check stored coats every 6–8 weeks. Look for signs of moths—tiny holes, webbing, or shed casings—and musty smells indicating mildew. Rotate garments slightly to disrupt hiding spots and promote airflow.

If you spot early signs of infestation, remove the coat immediately. Vacuum the storage area thoroughly, wash or dry clean affected items, and re-treat with natural repellents before returning to storage.

Step-by-Step Guide to Proper Winter Coat Storage

1. Assess the coat: Check the care label for cleaning instructions. Note any stains, loose buttons, or worn areas needing repair.
2. Clean thoroughly: Wash or dry clean based on fiber type. Remove all traces of dirt, oil, and odor.
3. Dry completely: Air-dry in a ventilated room for 24–48 hours. Confirm no dampness remains in linings or seams.
4. Repair if needed: Sew loose hems, replace missing buttons, or patch small tears to prevent further damage.
5. Choose storage location: Select a cool, dry, interior space away from sunlight and humidity.
6. Select breathable container: Use a cotton garment bag or vented plastic bin lined with acid-free paper.
7. Add natural repellents: Place cedar blocks, lavender sachets, or silica gel packs inside pockets and around the coat.
8. Hang or fold carefully: Hang structured wool coats on padded hangers. Fold down jackets loosely to preserve insulation.
9. Monitor periodically: Inspect every 6–8 weeks for pests, moisture, or odors.

Real Example: A Parka Saved from Mildew

Sarah from Portland owned a high-end down parka she wore all winter. In April, she stuffed it into a plastic bin in her basement, assuming “out of sight, out of mind” was enough. When she retrieved it in November, the coat had a sour smell and yellowish stains on the lining. A local outdoor gear shop diagnosed mildew caused by trapped moisture in a humid basement.

The technician advised immediate action: hand-wash with down-specific detergent, double-rinse, and tumble dry on low with clean tennis balls. After three cycles, the smell faded and the down re-lofted. Sarah now stores her coat in a cotton-lined bin with silica gel packs on an upper closet shelf—no recurrence in two years.

Do’s and Don’ts of Winter Coat Storage

Do’s	Don’ts
✓ Clean before storing	✗ Store dirty or damp coats
✓ Use breathable cotton bags	✗ Use sealed plastic bags
✓ Store in a dry, dark place	✗ Store in basements or attics
✓ Add natural moth repellents	✗ Rely solely on mothballs
✓ Inspect every few months	✗ Forget about coats until next winter

Frequently Asked Questions

Can I hang my down jacket long-term?

Yes, but only if it's stored in a breathable garment bag and not compressed. However, folding loosely is often better for preserving down loft. Avoid wire hangers—they can distort shoulders.

How do I know if my coat has moth damage?

Look for small, irregular holes—especially in hidden areas like under collars or along seams. You may also find silky webbing, tiny pellets (larvae droppings), or faint rust-colored specks (eggs). A musty or dusty smell can also indicate presence.

Is vacuum sealing safe for winter coats?

No. Vacuum sealing compresses insulation and traps moisture. While it saves space, it ruins the loft of down and synthetic fills, reducing warmth and potentially causing permanent fiber damage. Reserve vacuum bags for bulky bedding, not performance outerwear.

Conclusion: Protect Your Investment Year-Round

Properly storing winter coats isn’t just about freeing up closet space—it’s about preserving quality, function, and longevity. A well-maintained coat can last a decade or more, saving money and reducing waste. By cleaning thoroughly, choosing breathable storage, controlling humidity, and using natural pest deterrents, you create a defense system that protects against both moths and mildew.

Start now, even if winter feels far off. Take one afternoon to clean, dry, and prepare each coat with care. Label storage bins, set calendar reminders for inspections, and treat your outerwear like the valuable assets they are. The result? Coats that look new, smell fresh, and perform when you need them most.

💬 Have a storage hack that saved your favorite coat? Share your story in the comments—your tip could help another reader avoid disaster next winter.