In the U.S., children typically start kindergarten at age 5 and graduate high school at 17 or 18. Each grade level corresponds to a general age range, though the exact age depends on your state’s birthday cut-off date and whether a child started school early or late. Here’s the full breakdown from preschool through college.
Ages and Grades: The Complete Table
This table shows the typical age range for each grade level, assuming a student starts kindergarten at 5 and progresses one grade per year.
- Preschool: Ages 2–4
- Pre-Kindergarten (Pre-K): Ages 4–5
- Kindergarten: Age 5–6
- 1st Grade: Age 6–7
- 2nd Grade: Age 7–8
- 3rd Grade: Age 8–9
- 4th Grade: Age 9–10
- 5th Grade: Age 10–11
- 6th Grade: Age 11–12
- 7th Grade: Age 12–13
- 8th Grade: Age 13–14
- 9th Grade (Freshman): Age 14–15
- 10th Grade (Sophomore): Age 15–16
- 11th Grade (Junior): Age 16–17
- 12th Grade (Senior): Age 17–18
- College Freshman: Age 18–19
- College Sophomore: Age 19–20
- College Junior: Age 20–21
- College Senior: Age 21–22
Each age range spans two numbers because some students in the same grade will have already had their birthday that school year while others haven’t yet. A third grader who turned 9 in July and a third grader who won’t turn 9 until March are both the right age for their grade.
How Schools Are Organized by Level
U.S. schools group grades into broader levels, though the exact grouping can vary by district.
Elementary school covers kindergarten through 5th grade (ages 5 to about 10 or 11). Some districts run elementary through 6th grade instead. Middle school typically covers 6th through 8th grade (ages 11 to 13 or 14). You may also hear it called “junior high,” which sometimes starts at 7th grade. High school runs from 9th through 12th grade (ages 14 to 18). Students in these four grades are called freshmen, sophomores, juniors, and seniors, the same labels used in college.
Before kindergarten, preschool generally serves children ages 2 through 4, while Pre-K is specifically for 4- and 5-year-olds in the year right before kindergarten. Neither is required in most states, but many families use them to prepare younger children for the structure of a school day.
Why Birthday Cut-Off Dates Matter
Your child’s grade placement depends largely on your state’s kindergarten entrance cut-off date. To start kindergarten, a child must turn 5 on or before that date. The most common cut-off is September 1, used by roughly 20 states. Other common dates include August 31, September 30, and July 31. A few states set their cut-off as early as August 1, while others go as late as October 1 or even January 1.
Some states don’t set a single statewide date and let individual school districts choose. This means two children born on the same day could start kindergarten a full year apart depending on where they live. A child born on September 10, for example, would be eligible for kindergarten in a state with an October 1 cut-off but would need to wait another year in a state with a September 1 cut-off.
This is the main reason age ranges overlap. In a typical 1st grade classroom, you might find kids who are 6 alongside kids who are already 7, simply because of when their birthdays fall relative to the start of the school year.
Redshirting and Grade Skipping
Not every child follows the standard timeline. “Redshirting” is the practice of holding a kindergarten-eligible child back for an extra year, usually to give them more time to develop socially or academically. This is most common with children whose birthdays fall close to the cut-off date. A redshirted child will be about a year older than the youngest classmates in every grade going forward.
On the other end, some children skip a grade or start kindergarten early if they’re academically advanced. Most states have a process for early entrance, though requirements vary. Either scenario shifts the age-to-grade alignment by a year or more, which is perfectly normal.
Compulsory Attendance Ages
Every state requires children to attend school, but the age range for compulsory attendance varies quite a bit. Most states require enrollment by age 6, though a handful start at 5, 7, or even 8. On the upper end, some states require attendance until age 16, while others extend the requirement to 17, 18, or in one case 19.
Compulsory attendance laws don’t necessarily align with kindergarten eligibility. A state might allow children to enter kindergarten at 5 but not legally require attendance until age 6 or 7. That gap means kindergarten is technically optional for some families, depending on the state. Once your child reaches the compulsory age, though, enrollment in a public school, private school, or approved homeschool program is required by law.
College-Level Grade Names
For students who go straight to a four-year college after high school, the naming convention mirrors high school. First-year students (freshmen) are typically 18 to 19. Sophomores are 19 to 20, juniors are 20 to 21, and seniors are 21 to 22. These labels are based on credit hours completed, not strictly on age, so a student who takes extra time or transfers may carry a different class standing than their age would suggest. Community colleges and trade programs don’t always use these labels, since many students are part-time or non-traditional age.