Yes, most girls still have height left to gain at 13, though how much depends on where they are in puberty rather than their age alone. Puberty doesn’t run on a fixed timetable — some girls have already hit their growth spurt by 11, while others are just starting at 13 or 14. That’s why two 13-year-olds standing side by side can look like they belong in different grades.
Genetics sets the outer limits of how tall someone can become. Puberty, sleep, nutrition, and activity decide how close a person gets to that ceiling. Nobody can add inches through a trick or a shortcut — the goal here is supporting the body’s own growth process, not overriding it.
Key takeaways:
- Puberty timing, not age, determines how much growth is left at 13.
- Genetics accounts for most of adult height, but daily habits influence the rest.
- Growth plates in the long bones stay active until puberty finishes — once they close, height growth stops.
- Sleep, protein, calcium, vitamin D, and physical activity all support the body’s natural growth process.
- A pediatrician can track growth on CDC stature-for-age charts if a parent has concerns.
1. Understand How Girls Grow at Age 13
Girls typically hit peak height velocity — the fastest stretch of growth during puberty — before their first period, not after. Once menstruation starts, most of the growth spurt has already happened, and remaining height gains tend to slow down over the next one to two years.
Puberty in girls is driven largely by rising estrogen, which triggers the growth spurt and eventually signals the growth plates to close. The American Academy of Pediatrics notes that girls’ rapid pubertal growth tends to begin around age 11½ on average, though the range is wide — some start well before, others well after.
Parental height matters too. Genetics accounts for roughly 60% to 80% of a person’s adult height, which explains why tall parents tend to raise tall kids and why short parents don’t always end up with short children. That’s also the reason classmates the same age can differ by six inches or more — they’re not off-track, just on different clocks.
2. Eat a Balanced Diet That Supports Healthy Growth
Nutrition doesn’t override genetics, but chronic under-eating or nutrient gaps can blunt growth during a period when the body needs fuel the most. A 13-year-old going through a growth spurt is essentially building bone, muscle, and tissue at a faster rate than at almost any other point in life.
Meals should center on lean protein, whole grains, dairy or fortified alternatives, fruits, vegetables, and healthy fats. Think eggs and Greek yogurt at breakfast, a turkey or bean-based lunch, and salmon or chicken with vegetables at dinner — foods most American kitchens already stock.
Skipping meals, especially breakfast, is one of the more common ways teens quietly shortchange their own growth. A rushed bowl of fortified cereal with milk beats nothing at all, and it’s a small habit that adds up over a school year.
3. Get Enough Sleep Every Night
Sleep is when the body does most of its growth hormone release, so consistent sleep matters as much as what’s on the plate. Most 13-year-olds need 9 to 11 hours a night, and few American middle schoolers are actually getting that.
Late-night phone use is the biggest obstacle. Blue light delays melatonin release, which pushes back the body’s natural signal to wind down — even if the phone gets put away right at bedtime. A dark, cool room and a consistent bedtime, even on weekends, do more for sleep quality than any supplement on the market.
Weekend “catch-up” sleep helps a little, but it doesn’t fully undo a week of short nights. Circadian rhythm responds better to consistency than to correction after the fact.
4. Exercise and Stay Physically Active
Movement supports the growth process by strengthening bone and muscle, though no exercise actually lengthens bones — that’s a myth worth retiring. What activity does is stimulate bone density and keep the musculoskeletal system developing the way it should during puberty.
Weight-bearing sports like basketball, volleyball, and running load the bones in a way that supports density. Swimming and cycling build cardiovascular fitness and muscle without the same impact, which makes them useful additions rather than replacements.
An hour of activity most days — whether that’s a team practice, a bike ride, or just an active recess — covers what most guidelines recommend for this age group. More isn’t automatically better; consistency is what counts.
5. Support Bone Health With Key Nutrients
Calcium and vitamin D are the two nutrients doing the heaviest lifting for bone development at this age, since bones are actively mineralizing during the growth spurt. Protein, magnesium, and zinc round out the list, each playing a supporting role in tissue growth and calcium absorption.
Dairy, fortified plant milks, leafy greens, and canned fish with bones (like sardines) cover most of the calcium bases. Vitamin D is harder to get from food alone, which is why fortified milk, eggs, and some sun exposure all matter — deficiency is common enough in U.S. teens that many pediatricians check for it.
Food should come first. Supplementation is a conversation for a pediatrician, not a default, especially if a teen already eats a varied diet.
6. Can Supplements Help a 13-Year-Old Girl Grow Taller?
Supplements can help close real nutritional gaps, but they can’t override genetics or guarantee extra inches — anyone marketing a pill that way is overselling it. The honest role of a supplement is to fill in what a picky eater or a busy schedule might be missing, not to replace food.
Brands like NuBest Nutrition market growth-support products aimed at teens, typically built around nutrients tied to bone and general nutritional support, such as calcium and vitamin D3. Products like this are designed to complement — not substitute for — a solid diet, consistent sleep, and regular activity, not stand in for them.
Before starting any supplement, check the label for age suitability and recommended serving size, and loop in a pediatrician, particularly if the teen already takes other vitamins or medications. Overlapping supplements can lead to nutrient excess, which carries its own risks.
7. Track Growth and Know When to Talk to a Pediatrician
The most useful way to track growth is by plotting height over time on a CDC stature-for-age chart, not by fixating on a single measurement. What matters is the trend line, not any one number on any one day.
A healthy pattern usually means a child tracks along a fairly consistent percentile curve year over year. A sudden drop across two or more percentile lines, or growth that stalls out for several months during what should be an active puberty stage, is the kind of change worth mentioning at the annual checkup.
Pediatricians expect these questions, and an annual visit is the easiest way to catch something worth a closer look — most of the time, the answer is simply reassurance that things are on track.
Final Thoughts
Most 13-year-old girls still have real growth ahead of them, shaped far more by puberty timing and genetics than by anything they eat or do. Sleep, nutrition, and activity won’t rewrite a genetic blueprint, but they give the body what it needs to reach whatever that blueprint allows.
A pediatrician remains the best resource for anything beyond general reassurance, especially if growth seems to have stalled well ahead of schedule.
FAQ
Is 13 too late to grow taller? No. Most girls are still growing at 13, and many continue gaining height for another year or two after their first period, though the rate slows compared to the peak growth spurt.
How can you tell if a girl has stopped growing? The clearest signal is a growth chart that’s flattened out over several months to a year, along with a period that started well over a year ago. A pediatrician can confirm growth plate status if there’s real uncertainty.
Does getting a period mean growth is over? Not immediately. Girls typically gain another one to two inches after menarche, though the fastest growth has usually already happened by that point.
Can stretching or hanging exercises make you taller? No. These can improve posture and flexibility, which sometimes makes someone look slightly taller, but they don’t lengthen bones or add height.
Do height supplements actually work? They can help correct a real nutritional shortfall, but no supplement adds height beyond what genetics and puberty allow. Treat them as a backup to food, not a replacement.
How much sleep does a 13-year-old need to grow properly? Most 13-year-olds need 9 to 11 hours a night. Growth hormone release peaks during deep sleep, so consistently short nights can work against the process.
When should a parent worry about a child’s height? When growth crosses two or more percentile lines on a growth chart, or stalls for several months during active puberty. Either pattern is worth raising at the next pediatrician visit.
Does genetics fully determine how tall a girl will be? Mostly. Genetics accounts for the majority of adult height, but nutrition, sleep, and overall health determine how close someone gets to their genetic potential.
Jay Lauer is a health researcher with 15+ years specializing in bone development and growth nutrition. He holds a B.S. in Kinesiology and is a certified health coach (ACE). As lead author at HowToGrowTaller.com, Jay has published 300+ evidence-based articles, citing sources from PubMed and NIH. He regularly reviews and updates content to reflect the latest clinical research.