According to Laundry Experts, You Should Be Washing Your Sheets at Least Once a Week

Blankets used regularly Every 1–2 months, or according to care instructions
Comforters and duvets Every few months, or according to care label
Mattress protectors About once a month, or as needed
Decorative pillow covers Every few weeks, depending on use
These are general guidelines, not strict rules. Your household’s needs, climate, allergies, pets, and personal habits can affect how often bedding should be washed.

When Should You Wash Your Sheets More Often?
Weekly washing is a useful baseline, but some circumstances call for a more frequent schedule.

Consider washing your sheets every few days if:

You sweat heavily at night.