Most girls stop growing in height between ages 14 and 16, roughly two to three years after their first menstrual period. The exact age depends on when puberty started, genetics, and nutrition. Girls who enter puberty earlier tend to stop growing earlier, while those who develop later may continue gaining height into their late teens.
How Puberty Drives the Growth Timeline
A girl’s growth timeline is anchored to puberty, not to a fixed age on the calendar. The first visible sign of puberty is breast development, which typically begins between ages 8 and 13. This signals that the skeleton has reached a bone age of roughly 10 or 11 years, regardless of the girl’s actual age. From this point, the clock starts ticking on her remaining growth.
Peak height velocity, the fastest period of growth, happens relatively early in puberty. Girls hit their growth spurt between the early and middle stages of breast development, usually gaining somewhere around 6 to 8 centimeters (2.5 to 3 inches) per year at their peak. After the growth spurt passes, the rate of growth slows steadily until it stops altogether.
Growth After the First Period
One of the most common misconceptions is that a girl’s first period signals the end of growth. It doesn’t. On average, girls gain about 7 centimeters (roughly 3 inches) after their first period. Data from the Fels Longitudinal Study shows the amount varies depending on how early that period arrives. Girls who get their first period at age 10 gain an average of 10 centimeters (about 4 inches) afterward. Girls whose first period comes at age 15 gain closer to 5 centimeters (2 inches).
This makes sense biologically. Earlier periods mean the growth spurt is still in full swing, so more height is left to gain. Later periods mean the body has already completed more of its growing before menstruation begins. Either way, there is real, measurable growth still to come after that milestone.
What Actually Stops Growth
Height growth comes from growth plates, thin layers of cartilage near the ends of long bones. Throughout childhood and puberty, these plates generate new bone tissue that lengthens the skeleton. Estrogen, which rises dramatically during puberty, gradually causes these plates to harden and fuse with the surrounding bone. Once a growth plate fuses completely, that bone can no longer get longer.
In girls, growth plates at the knee begin complete fusion around ages 16 to 17. However, full fusion of all growth plates, including those in the thigh bone, shinbone, and smaller leg bone, isn’t seen in 100% of females until ages 20 to 21. This means that while most noticeable height gain ends by the mid-teens, very small amounts of growth can technically continue into the early twenties for some individuals. In practical terms, the gains after age 16 or so are usually too small to notice.
Why Some Girls Are Shorter or Taller Than Expected
Genetics is the strongest predictor of adult height. Pediatricians estimate a girl’s expected height using a simple formula: take the father’s height, subtract 5 inches (13 cm), add the mother’s height, and divide by 2. The result gives a midpoint, with most girls landing within about 2 inches above or below it.
Nutrition plays a meaningful role, especially during the growth spurt. The body’s demand for iron, calcium, vitamin D, iodine, and vitamin A increases sharply during peak growth. Deficiencies in these nutrients can impair linear growth and even delay puberty. In well-nourished populations, most girls reach their genetic potential without difficulty. But chronic undernutrition during adolescence can result in stunted height and delayed sexual development.
Chronic health conditions also matter. Any illness that affects hormone levels, nutrient absorption, or overall energy balance during childhood and puberty can influence final height. Conditions like celiac disease, thyroid disorders, and growth hormone deficiency are among the more common medical causes of shorter-than-expected stature.
When Puberty Starts Too Early
Precocious puberty, defined as breast development before age 8, can reduce a girl’s final adult height. The reason is straightforward: estrogen exposure begins too soon, causing growth plates to fuse before the body has had enough time to grow. Without treatment, girls with precocious puberty may end up several centimeters shorter than their genetic potential would predict.
Treatment involves medication that temporarily pauses puberty, giving the skeleton more time to grow before the plates close. Studies show that treated girls gain an average of about 4 centimeters (1.5 inches) over what their projected adult height would have been without intervention. Girls who begin treatment before age 6 tend to see the greatest benefit, though those treated between ages 7 and 10 also show meaningful height gains.
A Rough Timeline to Expect
- Ages 8 to 13: Breast development begins, signaling the start of puberty and the approaching growth spurt.
- About 1 to 2 years after breast development starts: Peak height velocity, the fastest growth of the entire pubertal period.
- About 2 to 3 years after breast development starts: First menstrual period arrives. Roughly 3 inches of growth remain on average.
- Ages 14 to 16: Growth slows significantly and most girls reach or come very close to their adult height.
- Ages 16 to 20: Growth plates gradually finish fusing. Any remaining growth is minimal, typically less than half an inch total.
Every girl moves through this sequence at her own pace. A girl who starts puberty at age 8 may be done growing by 14, while one who starts at 12 or 13 might not finish until 17 or 18. The pattern is consistent, but the calendar ages shift depending on when puberty begins.