Height Growth During Puberty: What to Expect

July 28, 2026

Somewhere between a child's last "normal" year and their first adult-sized shoes, puberty rewires the body's growth machinery almost overnight. For a couple of years, a teen who grew a steady 5–6 cm annually can suddenly gain 8, 9, even 10–12 cm in a single year — then slow down just as sharply. Parents often don't know whether what they're seeing is normal, early, late, or worth a doctor's visit. This guide walks through exactly what happens to height during puberty, in what order, on what timeline, and what actually influences how tall a teen ends up.

Key Takeaways

The pubertal growth spurt is triggered by rising sex hormones (estrogen and testosterone), which is also what eventually closes the growth plates and ends height growth for good.
Girls typically start their growth spurt around ages 10–11 and hit peak height velocity near age 12, about two years before boys, who peak closer to age 14.
Across the whole growth spurt, girls gain roughly 20–23 cm and boys roughly 25–28 cm of total height, though individual variation is wide.
Genetics sets the ceiling — roughly 80% of the difference in adult height between people — while sleep, nutrition, and overall health determine how close a teen gets to it.
For the biology of why growth eventually stops entirely, see our companion piece on Human Growth Hormone (HGH) and Height, and for the ceiling itself, our guide to The Role of Genetics in Determining Height.

What Actually Triggers the Growth Spurt

Puberty begins when the brain's hypothalamus starts releasing gonadotropin-releasing hormone (GnRH) in pulses, which signals the pituitary gland to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Those hormones, in turn, tell the ovaries or testes to start producing much larger amounts of estrogen or testosterone. Both sex hormones do two seemingly contradictory things to the skeleton at once: they stimulate the growth plates to grow faster than at any other point in life, and they simultaneously start the clock that will eventually fuse those same growth plates shut. This is why the fastest growth of a teen's life and the eventual end of all growth are driven by the exact same hormonal surge.

The Typical Timeline, Stage by Stage

Height growth during puberty doesn't happen at a constant rate — it follows a predictable arc of acceleration, peak, and deceleration. The stages below are typical patterns, not a strict schedule every teen follows exactly.

Stage 1: Onset (early puberty)

Growth rate begins ticking up from the steady childhood pace of about 5–6 cm/year. In girls this usually overlaps with breast budding; in boys it overlaps with early testicular growth, often a full year or more before any visible height change.

Stage 2: Acceleration

Growth rate climbs steadily month over month. This is usually when parents first notice pants getting short and shoe sizes jumping — the visible signal that the spurt has truly begun.

Stage 3: Peak Height Velocity (PHV)

The single fastest year of growth. Girls typically add around 8–9 cm in this year; boys typically add around 9–10 cm. In girls, PHV usually arrives shortly before the first menstrual period; in boys it arrives roughly midway through puberty, well after the voice starts changing.

Stage 4: Deceleration

Growth rate drops off, but doesn't stop abruptly — a teen typically still gains several more centimeters over one to two years as the growth plates gradually thin and slow their activity.

Stage 5: Plate fusion

Rising sex hormone levels eventually cause the growth plate cartilage to fully convert to solid bone. Once fused, that bone cannot lengthen again, regardless of diet, sleep, or exercise.

Timing checkpoint

Because the calendar age at each stage varies so much between individuals, a bone age X-ray is the only reliable way to know exactly where a specific teen is in this sequence — not their age or current height.

Typical Pubertal Growth Spurt, by Sex

Girls Spurt onset around ages 10–11, peak height velocity around age 12, total spurt height gain of roughly 20–23 cm, growth largely complete by ages 14–15

Boys Spurt onset around ages 12–13, peak height velocity around age 14, total spurt height gain of roughly 25–28 cm, growth largely complete by ages 16–17

These figures are population averages drawn from longitudinal growth studies, not individual predictions — a two-year difference in either direction is still within the range of normal pubertal timing.

What Actually Influences How Much a Teen Grows

Two teens can enter puberty at the same age and end up with very different height gains. The factors below explain most of that difference.

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Genetics sets the ceiling

Twin studies consistently attribute roughly 80% of the variation in adult height to genetics. Parental height remains the strongest single predictor of how tall a teen will ultimately be — see our Mid-Parental Height Calculator for an estimate based on that principle, or our Child Height Prediction Calculator for a broader estimate.

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Sleep drives the growth hormone pulse

Roughly 70–80% of daily growth hormone release happens during deep sleep, not while awake. Chronically shortened sleep during the pubertal years can measurably blunt growth rate, which is exactly why the site covers this in depth in How Sleep Affects Height Growth.

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Nutrition fuels the spurt

The growth spurt has real, elevated demands for protein, calcium, vitamin D, iron, and zinc. A teen who is chronically under-fed in any of these will grow slower than their genetic potential allows, even if that potential is high.

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Activity supports, but doesn't cause, growth

Regular exercise supports bone density, posture, and healthy growth hormone rhythms, but it does not add height beyond a teen's genetic ceiling. See Best Height Growth Exercises for Teenagers for what actually helps and why.

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Underlying health conditions can shift timing

Chronic illness, untreated thyroid conditions, and certain hormonal disorders can delay or blunt the pubertal growth spurt. Unusually early, late, or absent pubertal growth is worth discussing with a pediatrician rather than waiting it out.

▶ Watch: 7 Surprising Things That Stunt Growth During Puberty

Watch on YouTube ↗

Tracking Growth During Puberty

Because the pubertal spurt moves so fast, a single height measurement tells parents very little on its own — what matters is the trend over time relative to a teen's own growth curve. Plotting height every few months against standard growth charts is a far more useful signal than comparing a teen to classmates or siblings. Our Peak Height Velocity Calculator and Growth Percentile Calculator can help visualize where a teen currently sits, and a Bone Age Calculator-style X-ray assessment from a pediatrician remains the most reliable way to estimate remaining growth potential directly.

❓ Frequently Asked Questions

At what age do girls and boys stop growing taller?

Most girls finish the majority of their height growth by ages 14–15, with growth plates fully fused by around age 16–18. Most boys finish the bulk of their growth by ages 16–17, with fusion typically complete by around age 18–19. Individual timing can vary by a couple of years in either direction.

How much taller will my teen get during puberty?

On average, girls gain roughly 20–23 cm and boys roughly 25–28 cm across the full pubertal growth spurt, though genetics, nutrition, and overall health during those years shift the total considerably from teen to teen.

Is it normal for growth to happen in sudden bursts rather than steadily?

Yes. Growth during puberty is not linear — it accelerates, peaks, and decelerates over roughly two to three years, which is why clothing and shoe sizes can seem to change overnight during certain stretches and barely at all during others.

Can a late growth spurt still catch up to peers?

Often, yes. Constitutional delay of growth and puberty is a well-documented, usually benign pattern where a teen starts puberty later than peers but still reaches a normal adult height — typically confirmed by bone age testing showing "younger" skeletal maturity than the teen's calendar age.

Should I be worried if my teen isn't growing as fast as their friends?

Not necessarily — pubertal timing varies widely and is largely genetic. However, a growth rate that has clearly flattened for several months during expected pubertal years, or a teen who is significantly behind their own historical growth curve, is worth bringing to a pediatrician.

📚 References

Abbassi V. Growth and Normal Puberty. Pediatrics. 1998;102(2 Pt 3):507–511. pubmed.ncbi.nlm.nih.gov/9685454
Sandhu J, Ben-Shlomo Y, Cole TJ, et al. The Impact of Childhood Body Mass Index on Timing of Puberty, Adult Stature and Obesity: A Follow-Up Study Based on Adolescent Anthropometry. International Journal of Obesity. 2006;30(1):14–22. pubmed.ncbi.nlm.nih.gov/16344845
Silventoinen K, Sammalisto S, Perola M, et al. Heritability of Adult Body Height: A Comparative Study of Twin Cohorts in Eight Countries. Twin Research. 2003;6(5):399–408. pubmed.ncbi.nlm.nih.gov/14624724
Van den Broeck J, Dulgerçi N. Growth Charts and the Assessment of Pubertal Growth. Journal of Pediatric Endocrinology and Metabolism. 2008. pubmed.ncbi.nlm.nih.gov/18540254
Wu Y, Chen Y, Wang B, et al. Sleep Duration and Growth Hormone Secretion in Adolescents: A Review. Sleep Medicine Reviews. 2020;53:101335. pubmed.ncbi.nlm.nih.gov/32502843

Published on heightgrowthblog.com