Croup and colds in fall 2026: what parents should know
As of November 5, 2026, CDC reports that parainfluenza viruses, a common cause of croup, are increasing nationally, while rhinovirus and enterovirus colds are still high but easing. Most croup is mild and clears in 3 to 7 days, but noisy breathing while resting needs prompt care.
Health news · reviewed by the clinical team at Urgent Care Center of WestmontUpdated November 5, 2026
Parainfluenza viruses are increasing nationally. These viruses are a common cause of croup.
Rhinovirus and enterovirus are high but decreasing nationally. These viruses cause many fall colds.
Overall, the amount of respiratory illness sending people to a doctor is still very low.
Flu is also rising early this year, and flu can cause croup too. So a barking cough this month could come from more than one virus.
What croup is and why it sounds like a seal
Croup is swelling in the upper airway, around the voice box and windpipe. The MedlinePlus croup guide says it is usually caused by viruses such as parainfluenza, flu, RSV, measles or adenovirus. It mainly affects children 3 months to 5 years old and is most common from October through April.
Cold firstIt often starts with a runny nose and a low fever.
Barking coughA cough that sounds like a seal and a hoarse voice follow.
Noisy breathingSome children make a harsh, crowing sound when breathing in, called stridor.
Worse at nightSymptoms are usually worse at night and last up to 3 nights, sometimes up to 7.
Some children get spasmodic croup, which starts suddenly at night, often without a fever.
Croup or a common cold?
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The CDC common cold page says rhinoviruses are the most frequent cause of colds, and colds usually last less than a week. A cold and croup often start the same way. The cough is the main clue.
Croup
Barking, seal-like cough
Hoarse voice
Harsh sound when breathing in
Usually worse at night
Most common in children under 5
Common cold
Runny or stuffy nose and sneezing
Sore throat and mild cough
Low-grade fever, if any, in older children
Symptoms peak in 2 to 3 days
Can affect any age
Colds can lead to ear or sinus infections and can trigger asthma flares, CDC notes. Learn more about enterovirus symptoms.
Who is more likely to get very sick?
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The CDC parainfluenza page says these groups face a higher risk of serious lower respiratory illness:
Infants and young children
Older adults
People with a weakened immune system
Children with asthma, whose symptoms can get worse
There is no vaccine and no specific antiviral for parainfluenza, and antibiotics do not work against it. Flu and measles vaccines do protect against two other viruses that can cause croup.
Keep your child calm. Crying and being upset can make the cough and breathing worse.
Treat fever. For a fever of 100.4°F or higher, acetaminophen can help. Ibuprofen is an option for children over 6 months.
Offer fluids often.
Skip cough syrups. They do not help croup and may cause harm.
Steam and cool night air: the AAP says there is no proof these help.
Check on your child during the night. Croup symptoms are usually worse at night, and stridor while resting needs prompt care.
Croup care at our Westmont, IL clinics
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Urgent Care Center of Westmont, also known as Immediate Care Center of Westmont, sees children through pediatric urgent care at two clinics in Westmont, IL, open 7 days a week. Our team is led by board-certified physicians.
A clinician listens to your child's breathing and checks oxygen level, hydration and fever.
We can test for flu, COVID-19 or RSV when the result would change care.
Treatment may include prescription medicine, such as a steroid to reduce airway swelling, when appropriate.
If pneumonia is a concern, a chest X-ray is available at our 29 N Cass Ave clinic only.
Consider a visit if home care is not helping, your child seems more irritable, or symptoms last more than a week or keep coming back. You can book online for the Cass Ave clinic.
A croup cough sounds like a bark, often compared to a seal. Your child's voice may also sound hoarse. Some children make a harsh, high-pitched sound when they breathe in, called stridor. Stridor while your child is calm and resting is a sign of more serious croup and needs prompt care.
Is croup contagious?
The viruses that cause croup are contagious. Parainfluenza spreads through coughs and sneezes, close contact, and touching surfaces and then the mouth, nose or eyes. Washing hands, covering coughs and keeping sick children home from daycare or school until they are fever-free help limit spread.
How long does croup last?
Croup is usually mild and clears in 3 to 7 days. The barking cough and noisy breathing are often worst for the first 2 or 3 nights. If symptoms last more than a week, keep coming back, or your child seems to be getting worse, have a clinician check your child.
Can adults get croup?
Croup mainly affects children 3 months to 5 years old. In adults, CDC says parainfluenza viruses mostly cause upper respiratory infections, like a cold with a sore throat and cough. Adults can still pass these viruses to young children, so wash your hands often and cover coughs and sneezes.
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