What Is the Puberty Growth Spurt?
The puberty growth spurt is a period of rapid height and weight gain triggered by a surge in growth hormone, sex hormones, and insulin-like growth factor 1 (IGF-1). During this phase, bones lengthen faster than at any other point in life outside of infancy.
It's also a time of major change beyond height — muscle mass, body composition, voice, and overall shape all shift as the body matures.
When Does the Puberty Growth Spurt Start?
The timing is largely controlled by genetics, but there are well-known average windows for both girls and boys. Girls typically enter puberty — and the growth spurt — earlier than boys, which is why girls are often taller than boys around middle school.
| Group | Spurt Begins | Peak Growth | Spurt Ends |
|---|---|---|---|
| Girls | 8–13 years | 11–12 years | 14–15 years |
| Boys | 10–15 years | 13–14 years | 16–17 years |
Starting earlier or later than average is usually normal. Persistent delays or unusually early development, however, are worth discussing with a pediatrician.
When Does the Growth Spurt Peak?
The peak of the growth spurt is called peak height velocity (PHV) — the point at which you grow the fastest. PHV usually happens about 1 to 2 years into puberty.
At peak, girls typically grow around 3 to 3.5 inches (8–9 cm) per year, while boys average closer to 4 inches (10 cm) per year. Some teens grow even faster for a few months at a time.
How Much Total Height Do You Gain?
Across the entire puberty growth spurt — from start to finish — most teens gain a substantial amount of height:
Girls: roughly 8–10 inches (20–25 cm) total, contributing around 15–20% of their final adult height.
Boys: roughly 10–12 inches (25–30 cm) total, contributing around 18–20% of their final adult height.
Boys generally end up taller because they start their spurt later (giving them more years of pre-puberty growth) and grow faster at peak.
When Does the Growth Spurt Slow Down?
After PHV, growth velocity drops noticeably each year. By the late teen years, height gain slows to a trickle and eventually stops as the growth plates close and bones can no longer lengthen.
For most girls, the spurt is essentially over within 2–3 years of their first period. For boys, height typically plateaus 2–3 years after their voice deepens and facial hair fills in.
Signs the Growth Spurt Is Ending
Slower year-over-year height changes. Going from gaining 3+ inches a year to under 1 inch is a strong signal.
Completion of late puberty markers. For girls, fully developed breasts and hips; for boys, deeper voice, broader shoulders, and adult-pattern body hair.
Shoe size stabilizing. Feet usually stop growing before final height is reached.
Bone age catching up to chronological age. A doctor can confirm with a bone age X-ray.
How to Support Healthy Growth During This Window
You can't change your genetics, but you can avoid losing inches you would have otherwise gained. Three habits matter most:
Nutrition. Adequate protein, calcium, vitamin D, zinc, and overall calories are essential. Skipping meals or chronic under-eating during puberty can blunt growth potential.
Sleep. Most growth hormone is released during deep sleep. Teens need 8–10 hours per night, and consistent sleep timing matters as much as duration.
Movement. Weight-bearing and posture-supporting activity helps bones develop properly. See our list of the best exercises to grow taller for teens for a starting point.
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Frequently Asked Questions
The active spurt typically lasts about 2 to 3 years from start to slowdown. After peak height velocity, growth decelerates each year and tapers off as the growth plates close in the mid-to-late teens.
Yes, but only a little. Most girls grow another 1 to 2 inches after their first period (menarche) before their growth plates fully close. The biggest height gains happen in the year or two before menarche, not after.
Rising sex hormones — especially estrogen — eventually signal the growth plates to harden into solid bone. Once the plates fully fuse, long bones can no longer lengthen, and height growth ends. Nutrition, sleep, and overall health can affect how close you get to your genetic potential, but they cannot extend the window itself.
You can't predict the exact date, but genetics and family history are strong indicators. If parents and siblings entered puberty early or late, you'll likely follow a similar pattern. Doctors can also estimate timing using a bone age X-ray and Tanner stage assessment.
Two reasons. First, boys start puberty about two years later than girls, giving them more pre-puberty growth time. Second, boys' peak height velocity is higher (about 10 cm/year vs. 9 cm/year for girls). The combined difference averages roughly 13 cm (5 inches) in adult height.
