Spring in Denver means longer days, lighter layers, and the ceremonial retirement of parkas that survived yet another snow tease. But before you shove sweaters into a bin and call it a day, consider this: improper storage can mean moth holes, mystery stains, and stretched-out knits come fall.

According to journalist Sarah Durn for The New York Times, long-term storage of natural fibers comes with risks (including stains, odors, and moth damage), especially when pieces sit untouched for months The good news? A little prep now means your September self will thank you.

Start by cleaning both your closet and your clothes. Durn suggests dusting and vacuuming thoroughly, since moths are attracted to dark, undisturbed spaces where they can lay eggs. Even small traces of perspiration or food can attract them, which is why experts recommend laundering or dry-cleaning garments before storage. Make sure everything is completely dry before packing; trapped moisture can lead to mildew.

When it comes to storage, folding typically beats hanging for heavy knits, which can stretch under their own weight. The American Cleaning Institute recommends storing sweaters flat in breathable containers and using acid-free tissue to help maintain shape and prevent sharp creases. For long-term storage, cotton garment bags allow airflow while protecting from dust, whereas sealed plastic bins can be useful if items are fully dry and stored in a cool, climate-controlled space.

As for mothballs, the EPA explains they contain pesticides and should be used strictly according to label directions due to potential health risks. Non-toxic alternatives like cedar blocks or lavender sachets may help deter moths, though they are generally considered repellents rather than guaranteed prevention methods.

Finally, store everything in a cool, dry, and dark place. Avoid attics or garages if heat and humidity fluctuate, as these conditions can damage fabrics and encourage pests. Store smart now, and your favorite cashmere won’t ghost you next season.