Croup typically lasts 3 to 7 days: worst at night, worst on the first 1-2 nights, with the barking cough and breathing noise fading over the week.
The home playbook for mild cases: keep the child calm (crying worsens the noise), sit them upright, try cool night air or a steamy bathroom, and manage fever with acetaminophen or ibuprofen. The same-night emergency signs: stridor while calm at rest, skin pulling in between the ribs or at the neck with breaths, drooling or swallowing trouble, blue or gray lips, marked agitation or limpness, or a child unable to speak or cry. Those are 911 or the ER, because the airway is the issue. Office treatment is fast and effective: a single dose of dexamethasone works within hours, with nebulized epinephrine for severe presentations. A course beyond a week, or croup that keeps recurring, deserves a doctor visit to look for underlying causes. Most children have one dramatic night and recover fully within the week.
What to do
Common questions
How long does croup last?
Croup runs about 3 to 7 days, and the pattern is distinctive: the barking, seal-like cough and the harsh breathing sound (stridor) are much worse at night, and the first night or two are usually the worst. MedlinePlus notes it most often lasts up to 3 nights but can stretch to 7, and rarely recurs over weeks; talk to the doctor if it lasts beyond a week or keeps coming back. Home management for the mild nights: stay calm yourself (crying worsens the stridor), sit the child upright, and try cool night air or a steamy bathroom; both are traditional remedies families find helpful. Acetaminophen or ibuprofen handles the fever. The cases that need the ER tonight: stridor at rest (the breathing noise present even when calm), visible tugging-in of the skin between the ribs or at the neck with each breath, drooling or trouble swallowing, blue or gray lips, extreme agitation or exhaustion, or a child who cannot speak or cry. Those mean 911 or the emergency department, because croup can obstruct the airway. The doctor's office version: a single dose of steroid (dexamethasone) is the standard treatment and works within hours, sometimes with nebulized epinephrine for severe cases. Most kids get one memorable rough night and recover fully in under a week.