The 4-Year-Old Shots: The Pre-Kindergarten Round, Explained
The 4 to 6-year window is when several childhood series get a booster. Here is what the CDC chart shows and how it relates to a school district form.
Published
The 4 year old shots are four final doses placed in one band, 4 through 6 years, on the CDC child and adolescent immunization schedule: DTaP dose 5, polio dose 4, MMR dose 2 and varicella dose 2. A child vaccinated at five is on time by that chart; a school enrollment form may set an earlier deadline.
Key takeaways
- Four series end in the CDC's 4 through 6 year band: DTaP dose 5 of 5, polio dose 4 of 4, MMR dose 2 of 2 and varicella dose 2 of 2.
- The band is two years wide, so a dose given at age five or six is on time by the CDC chart; these are the last routine childhood doses before the preteen visit.
- A school immunization form is a state-law compliance document with an enrollment deadline; the CDC chart is national medical guidance by age band. They overlap but are not the same list.
- CDC's SchoolVaxView data for the 2025-26 school year reports kindergarten coverage of 92.0% for DTaP and 92.4% for MMR and polio, with exemptions rising to 4.2%.
- Record four fields per dose: vaccine name as printed, date, dose number, and product name if a combination shot was used.
Families usually meet this round twice — once at the well-child visit, once in a school enrollment packet that lists the same vaccines in different words. Those two documents are written by different bodies for different purposes, and confusing them is the most common way this round goes wrong.
What the CDC chart shows at 4 through 6 years
Four vaccine lines have a dose in this band on the CDC's child and adolescent immunization schedule by age, which carries an "Addendum updated July 2, 2025" line.
| Vaccine | Which dose | Age band |
|---|---|---|
| DTaP | Dose 5 of 5 | 4 through 6 years |
| Inactivated poliovirus (IPV) | Dose 4 of 4 | 4 through 6 years |
| Measles, mumps, rubella (MMR) | Dose 2 of 2 | 4 through 6 years |
| Varicella (chickenpox) | Dose 2 of 2 | 4 through 6 years |
The disease-specific CDC pages give the same ages. The measles vaccination page, last reviewed April 29, 2026, places the second MMR dose at "4–6 years old"; the chickenpox vaccination page, last reviewed August 21, 2024, uses the same ages for the second varicella dose.
Influenza is the fifth line and behaves differently: it is annual from six months of age, so whether a flu vaccine happens at this visit depends on the month, not the birthday. Anything unfinished from earlier bands can also be caught up here, which is why some children leave with more lines on the paperwork than the table above suggests. The doses that opened at the first birthday are covered in what happens at the 12-month visit.
Why the school packet is a different document
The CDC chart is medical guidance issued nationally. A school immunization form is a compliance list written under state law by a state health department or education agency, and it exists to decide one question: may this child attend.
That difference produces four practical mismatches.
- Different authors. No state is required to copy the CDC chart, and states word their lists their own way.
- Different vocabulary. The chart names vaccines; a district form often names diseases, or asks for a dose count per disease.
- Different deadlines. The chart uses age bands. A school form uses an enrollment date, which can arrive before a child reaches the end of a band.
- Different consequences. Missing a chart band is a clinical conversation. Missing a school deadline is an attendance problem.
How districts actually process the paperwork, and what counts as acceptable proof, is covered in what school nurses accept as proof; the requirement side sits in how kindergarten vaccine requirements work.
Where the two lists come apart
Coverage data shows the gap is real at scale rather than anecdotal. The CDC's SchoolVaxView coverage and exemptions data reports national kindergarten coverage for the 2025-26 school year of 92.0% for DTaP and 92.4% for both MMR and polio, and exemptions from one or more vaccines rising "to 4.2% from 3.6%," with 24 states above 5%.
The everyday version of the gap is smaller and more mundane. A child seen at four years and two months gets the round; the district form is due in July and asks for the same doses; the family has the after-visit paperwork somewhere but not the dates. Or the second MMR dose was given at three and a half because of a measles exposure, so the record does not look like the chart even though the series is complete.
A dated record answers both. Which is why the 4 year old shots are worth writing down carefully even in a household that files nothing else.
There is a timing trap here too. Districts often want the completed form weeks before classes start, while pediatric offices are at their busiest in late summer. A visit booked in June is a different experience from one booked in August, and the CDC band gives you a two-year runway to book it in. The American Academy of Pediatrics keeps its own 2026 immunization schedules for birth through 6 years, which is the version some practices work from at the desk.
What to bring, and what to file afterwards
Bring whatever record you already hold — a paper card, a clinic printout, a photo of one. If more than one child lives in the house, put a name on it before you leave home. Bring the school form itself if you already have it, so the office can fill it while the child is in front of them.
Afterwards, record four fields per line: the vaccine name exactly as printed, the date, the dose number when it is shown, and the product name if a combination shot was used. Those four fields are what a nurse, a camp form or a new pediatrician will ask for later.
Vaxnext, the free app for iPhone and Android from the people who write this blog, is one way to hold those four fields. It keeps a folder per family member with no cap on how many, so a household filling three district packets in the same August is not working from one shared list. What you type stays on the phone and comes back out as a JSON file through the phone's own share sheet when a school or a new practice asks for it. The app is free because it carries AdMob ads, declared as such on Google Play and kept off the record screens.
This article is general information about a published schedule, not medical advice; what your child is due for is a question for your pediatrician. It does not state any state's requirements, cover exemption law, or cover what to do about a reaction, which is a call to the clinic or to emergency care.
FAQ
Are the 4-year-old shots the same as the school requirements?
Not necessarily. The CDC schedule is national medical guidance organized by age band; a school immunization list is written under state law and organized around an enrollment date. They usually overlap heavily, because most states build their lists from the same recommendations, but the wording, the dose counts requested and the deadlines can differ. Read the district packet as its own document and check it against your dated record.
What if the 4-year visit happens at age five?
That is inside the band. The CDC chart places DTaP dose five, polio dose four, MMR dose two and varicella dose two across 4 through 6 years, so a child vaccinated at five is on time by the chart. A school deadline is the separate constraint: enrollment paperwork may fall due before the child reaches the end of that band, so check the district's date rather than the birthday.