Short answer: in the United States, a child who is 6 years old at the start of the school year is usually in 1st grade. A 5 year old is usually in kindergarten. A 10 year old is usually in 5th grade.

"Usually" is doing real work in those sentences, because grade placement depends on your child's birthday relative to your state's cut off date, not on their age alone. Two children the same age can be a full grade apart.

Here is the complete chart, then the explanation.

Grade by Age: The Complete Chart

Ages below are the child's age at the start of the school year, which is the number that determines placement.

Early childhood

Ages 3 to 4. Preschool.
Ages 4 to 5. Pre-K.

Elementary school

Ages 5 to 6. Kindergarten.
Ages 6 to 7. 1st grade.
Ages 7 to 8. 2nd grade.
Ages 8 to 9. 3rd grade.
Ages 9 to 10. 4th grade.
Ages 10 to 11. 5th grade.

Middle school

Ages 11 to 12. 6th grade.
Ages 12 to 13. 7th grade.
Ages 13 to 14. 8th grade.

High school

Ages 14 to 15. 9th grade, freshman.
Ages 15 to 16. 10th grade, sophomore.
Ages 16 to 17. 11th grade, junior.
Ages 17 to 18. 12th grade, senior.

A quick way to check any age: subtract 5 from your child's age at the start of the school year. A 9 year old is in roughly 4th grade. A 13 year old is in roughly 8th. The result is approximate for exactly the reason covered next.

Note that elementary school is not defined identically everywhere. Most districts run kindergarten through 5th grade, as we do, but some run K through 4, K through 6, or K through 8. Middle school and junior high boundaries vary the same way.

How Age Cut Off Dates Work

Every state sets a date by which a child must turn 5 to enter kindergarten that year. That date is why the chart above gives ranges instead of single ages.

In Oregon, a child must turn 5 on or before September 1 to start kindergarten that fall.

So consider two children born a week apart. One born in late August turns 5 just before the deadline and starts kindergarten at barely 5. One born in early September misses it by days, waits a year, and starts kindergarten at nearly 6. By 1st grade those two children are a full grade apart despite being almost exactly the same age, and they will stay a grade apart for thirteen years.

Cut off dates vary considerably across the country. Some states use September 1 as Oregon does, others use dates as early as August or as late as December or January, and a few leave the decision to individual districts. This is the single most common reason parents find that their child would be in a different grade after moving.

If you are relocating, check the receiving state's cut off before you assume placement carries over.

What Each Elementary Grade Actually Covers

A short guide to what the elementary years look like, since knowing your child's grade is only useful if you know what happens in it.

Kindergarten, ages 5 to 6. The year children learn to be students. Letters and letter sounds, counting and early number sense, and above all the social and self regulation skills that make classroom learning possible: following multi step directions, taking turns, managing their own belongings, asking for help. Far more academic than it was a generation ago, and far more social than most parents expect.
1st grade, ages 6 to 7. The year formal academics begin in earnest. Children move from letter sounds to actually reading, from counting to addition and subtraction, and from drawing to writing sentences. The jump in expected independence and stamina from kindergarten is the largest of the elementary years.
2nd grade, ages 7 to 8. Reading fluency consolidates, and children begin reading to learn rather than learning to read. Two and three digit arithmetic, longer writing, and the beginnings of real independent work.
3rd grade, ages 8 to 9. A genuine turning point. Multiplication and division, multi paragraph writing, and research and reasoning tasks. Many states assess reading at the end of this year, which is why reading by third grade is such a common phrase in education policy.
4th grade, ages 9 to 10. Longer, more analytical work. Fractions and decimals, sustained writing, and content area reading in science and social studies. Organizational demands increase sharply.
5th grade, ages 10 to 11. The capstone of elementary school. Pre algebra thinking, extended projects, and the independence and study habits needed for middle school. Often the year children take on real leadership within a school.

Starting Early, Starting Late, and Repeating a Year

Three situations come up constantly and none of them deserves the anxiety attached to them.

Starting early. Some districts allow early entry by assessment for children who narrowly miss the cut off. Where it is available it is usually a formal process with developmental and academic evaluation, not a conversation. Ask your district or school directly, and know that many places do not permit it at all.
Starting late, sometimes called redshirting. Holding a child with a summer or late birthday back a year so they start kindergarten at nearly 6 rather than barely 5. This is common and it is not a judgment on a child. The research is genuinely mixed: early advantages in relative maturity tend to fade over the elementary years, and the decision is best made on your specific child's social and emotional readiness rather than on a general rule. Talk to a preschool teacher who knows your child, because they have seen a hundred children make this transition and you have seen one.
Repeating a grade. Much less common than it used to be, and educators are generally cautious about it, because outcomes for retained students are mixed and the social cost is real. When it is considered, it should follow a specific diagnosis of what is not working and a concrete plan, not just another year to mature.

If you are weighing any of these, readiness is a broader picture than academics. Our kindergarten readiness checklist walks through the social, emotional, motor, and language skills that matter most.

Grade Placement When You Change Schools or Move

Placement usually transfers, but not always, and there are three things worth knowing.

Cut off dates differ. As above, this is the main reason a child's grade can change with a move. A child who started kindergarten at 4 in a state with a December cut off may be placed a year back in a state with a September one.
Private and charter schools have discretion. A private school is not bound by district placement and can, and sometimes does, place a child differently based on records and assessment. Ask about the policy before you enroll rather than after.
Records matter. Bring report cards, assessment results, and any IEP or 504 documentation. Placement conversations go much better with paperwork in hand.

One note specific to immersion schools

If you are looking at a Spanish immersion or dual language program and your child is past kindergarten with no Spanish, placement is a real conversation rather than an automatic no.

Entering an 80/20 immersion model in kindergarten or 1st grade is straightforward, because every child in the room is starting from the same place and the whole design assumes zero Spanish. Entering in 4th or 5th grade with no Spanish is genuinely harder, because classmates have had years of academic Spanish and the content is demanding.

Harder is not impossible, and it depends on the child, the family's commitment, and what support the school can put in place. What it deserves is a candid placement conversation with the school rather than a hopeful assumption in either direction. Any immersion school worth attending will give you a straight answer, including not this year.

Frequently Asked Questions

What grade is a 6 year old in?

A child who is 6 at the start of the school year is usually in 1st grade. A child who turns 6 partway through the year is often still in kindergarten. The determining factor is the child's birthday relative to the state's kindergarten cut off date, which in Oregon is turning 5 on or before September 1.

What age is elementary school?

Elementary school typically covers ages 5 through 11, kindergarten through 5th grade, though districts vary. Some run kindergarten through 4th grade, some through 6th, and some through 8th. Spanish Horizons Academy serves kindergarten through 5th grade, ages roughly 5 to 11.

What is the cut off age for kindergarten?

It depends on the state. In Oregon a child must turn 5 on or before September 1 to enter kindergarten that fall. Other states use dates ranging from August through the following January, and some leave it to individual districts. Always check the specific state and district, particularly if you are moving.

Can a child start kindergarten at 4?

In some places, yes. States with later cut off dates, in December or January, mean a child can legitimately start kindergarten at 4 and turn 5 during the year. Some districts also allow early entry by assessment for children who narrowly miss the cut off. In Oregon, with its September 1 cut off, starting at 4 is not typical, and any early entry would be a formal district process.

About Spanish Horizons Academy

We are a K-5 Spanish immersion and Expeditionary Learning school in Hillsboro, Oregon, serving children from kindergarten through 5th grade with one classroom per grade and 12 to 16 students in each. Our 80/20 model teaches math, science, social studies, and the arts in Spanish, with English Language Arts in English.

No prior Spanish is required, and most of our families do not speak Spanish at home. If you are working out where your child fits, we are happy to talk it through, including whether we are the right choice. Schedule a tour or explore our programs.