At What Age Do You Get Varicella Vaccine? | Timing By Dose

Children usually get the first chickenpox shot at 12–15 months and the second at 4–6 years.

Varicella vaccine protects against chickenpox, and the age timing is pretty straightforward for most families. In the United States, the routine schedule starts after a child’s first birthday. Then the second dose comes in the preschool years, right before the age when classroom exposure gets a lot more common.

That simple answer helps most readers, but the full picture matters too. A child who missed the first dose follows one timing rule. A teen who never got vaccinated follows another. Adults can still need varicella vaccine as well, mainly if they don’t have proof of immunity from prior illness or prior vaccination.

At What Age Do You Get Varicella Vaccine If You Missed It?

For routine vaccination, the first dose is given at 12 through 15 months. The second dose is given at 4 through 6 years. Those ages are the standard schedule used in pediatric care and school-readiness planning.

If a child misses the first dose at 12 to 15 months, the vaccine does not lose its place. The child can still catch up. What changes is the spacing between doses and the age band used for that catch-up plan.

Routine Ages For Children

The first dose starts at 12 months because the vaccine is licensed for people 12 months and older. Before that age, the routine chickenpox schedule does not begin. The second dose lands at 4 to 6 years, which gives a long window for the immune response to build and then get reinforced before elementary school.

Two doses give stronger protection than one. CDC notes that two doses of varicella vaccine are about 90% effective at preventing chickenpox, which is one reason the second dose matters even when a child already had the first shot.

Catch-Up Timing For Ages 7 Through 12

If a child reaches age 7 without finishing the series, the second dose can still be given. For children younger than 13, the minimum interval between dose one and dose two is 3 months. That spacing matters when a family is trying to get school records up to date without starting over.

Parents often worry that a missed year means the schedule is ruined. It isn’t. The goal is to finish the series using the right interval for the child’s current age.

Catch-Up Timing For Teens And Adults

Once someone is 13 or older and does not have evidence of immunity, the standard catch-up plan is 2 doses of single-antigen varicella vaccine 4 to 8 weeks apart. If dose two happens later than 8 weeks after dose one, the series does not restart. You just pick up where it stopped.

That catches many people by surprise. Chickenpox is often treated like a little-kid illness, yet older teens and adults can still need vaccination when records are missing and prior infection was never confirmed.

Why The Schedule Lands At These Ages

The timing is built around risk and response. The first dose comes after infancy, when routine use begins. The second dose is set in the 4-to-6-year range, which lines up with the years just before school mixing increases.

There’s also a practical side to it. The preschool visit is already a checkpoint for other routine vaccines, so adding the second varicella dose there makes it easier for families and clinics to keep the record complete.

For the official age chart and catch-up intervals, the CDC child and adolescent immunization schedule is the reference clinicians use.

Ages And Catch-Up Rules At A Glance

The schedule gets easier to read when it is laid out by age group. This table shows where most people fit and what the next step usually looks like.

Age Group	Usual Varicella Dose Rule	What Happens Next
Under 12 months	No routine varicella vaccination yet	Wait until the child reaches 12 months
12–15 months	First routine dose	Plan the second dose at 4–6 years
16 months–3 years	First dose if it was missed earlier	Second dose still comes later unless catch-up is needed sooner
4–6 years	Second routine dose	Series is complete after dose two
7–12 years, one prior dose	Catch-up second dose	Minimum gap between doses is 3 months
7–12 years, no prior doses	Start catch-up series	Use age-based spacing for both doses
13 years and older, no immunity	2-dose catch-up series	Give doses 4–8 weeks apart
Adult with one prior dose	Finish the series	Give the second dose; no restart is needed

The catch-up rules do a lot of the heavy lifting here. They let clinicians finish protection without tossing out earlier valid doses. That saves time, keeps records cleaner, and avoids extra shots.

CDC lays out the full routine and catch-up plan in its varicella vaccine recommendations, including the rule that children get the first dose at 12 through 15 months and the second at 4 through 6 years.

When The Timing Changes

Age is the starting point, not the whole story. A few situations change whether someone needs the vaccine now, later, or not at all.

If Someone Already Had Chickenpox

A confirmed history of chickenpox can count as evidence of immunity. So can lab evidence, or a record of age-appropriate vaccination. In many adults, birth in the United States before 1980 is also treated as evidence of immunity. There are carve-outs, though: that birth-year rule does not apply to pregnant women, healthcare personnel, or immunocompromised people.

That’s why “I think I had chickenpox as a kid” is not always enough on its own. If the history is vague, the next step depends on the person’s age, health status, and record trail.

If The Person Is Pregnant

Pregnancy changes the timing in a big way. Varicella vaccine is a live vaccine, so it should not be given during pregnancy. CDC also says nonpregnant women who get vaccinated should avoid becoming pregnant for 1 month after each injection. The wording is clear in the CDC pregnancy vaccination guidance.

If a pregnant person has no evidence of immunity, vaccination is usually handled after pregnancy instead of during it. That is one of the clearest age-and-timing exceptions in the whole schedule.

If The Immune System Is Weakened

Some people with immune system problems can receive varicella vaccine, while others should not. The answer depends on the condition, the level of immune suppression, and the vaccine product being used. This is one of those moments where the age chart alone is not enough. The medical history drives the decision.

• People with severe immune suppression may need a different plan.
• People with HIV may still qualify in some settings, based on immune status.
• Household contacts of immunocompromised people can still be candidates for vaccination.

That split is why two people of the same age can get different advice and both can be right.

What To Bring To A Vaccine Visit

A missed varicella record can turn a simple appointment into a guessing game. Bringing the right details makes the timing decision much easier.

• Any old immunization card or school vaccine form
• Past clinic records that show one prior varicella dose
• Notes about prior chickenpox diagnosed by a clinician
• A medication list, mainly if immune-suppressing drugs are involved
• Pregnancy status when that applies

For children ages 12 months through 12 years, a clinic may use either single-antigen varicella vaccine or the combined MMRV product, depending on the visit and the child’s record. For people 13 and older, the catch-up schedule uses single-antigen varicella vaccine.

Common Timing Questions Sorted By Situation

This second table is a handy way to match the age question with the usual real-life scenario that sits behind it.

Situation	Usual Rule	Timing Note
Healthy child turning 1	Give first dose	Routine window is 12–15 months
Healthy child at preschool visit	Give second dose	Routine window is 4–6 years
Child under 13 with one old dose	Give catch-up second dose	Minimum interval is 3 months
Teen with no record and no immunity	Start 2-dose catch-up series	Doses are 4–8 weeks apart
Adult with one prior dose	Finish with dose two	No series restart if the gap is long
Pregnant person with no immunity	Delay vaccination	Handle timing after pregnancy

The Ages Most People Need To Know

If you only want the age checkpoints, here they are: first dose at 12 through 15 months, second dose at 4 through 6 years, catch-up for older children who fell behind, and 2 doses 4 to 8 weeks apart for teens and adults 13 or older without evidence of immunity.

That makes the article’s main question easier to answer in plain English. Most children get varicella vaccine in two stages, one after the first birthday and one in the preschool years. If those windows were missed, the vaccine can still be given later using catch-up timing that fits the person’s age and health record.