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A seven-year-old in a superhero cape sprinting the last 50 yards of a one-mile fun run, then asking when the next one is. A seventh grader at her first cross country meet, nervous about the hill everyone keeps talking about. A high school junior wondering if she’s ready for a half marathon with her mom. Kids’ running is wonderful because it’s so simple, but “how far is too far?” is the question every parent asks. This page answers it with the guidance from the Road Runners Club of America (RRCA) and the American Academy of Pediatrics (AAP), then covers school cross country, the health issues that matter for growing runners, and parents’ most common questions.
For the sport at every level, start at our running hub.
How far should kids run? Distances by age
The RRCA’s “FUNdamentals of Youth Running,” part of its Kids Run the Nation program, gives these race-distance guidelines:
| Age | RRCA guideline |
|---|---|
| 5 and under | “Dash” events, from a few yards to 400 meters |
| 5 and over | Kids’ fun runs of ½ to 1 mile, with running and walking mixed |
| About 8–12 and over | May want to try a 5K |
| About 13–15 and older | May want to try a 10K to half marathon |
| About 15–18 and older | May want to try a marathon or longer |
The RRCA adds two important points. Longer distances (10K and over) should wait until after puberty, and around age 12 for girls and 14 for boys, developmental changes let young runners increase training distance and time. And these are general guidelines: what a child can handle, physically and emotionally, depends on the child.
What pediatricians say about marathons
The AAP is more cautious than the RRCA at the long end. Its HealthyChildren.org running page says children and teens should not be encouraged to run marathons, and that youth records shouldn’t be kept, so kids aren’t pushed toward them. Many marathons set a minimum age anyway: the Boston Marathon requires runners to be 18 on race day. A middle ground many families use: 5Ks and fun runs for kids, longer races in the later teen years if the teen wants them, built up gradually and with a coach.
For training, the AAP’s running advice suggests raising weekly mileage by no more than 10%. Its report on sports specialization recommends one to two days off a week from organized sport and waiting until about 15 or 16 to focus on a single sport. Kids who play several sports have fewer overuse injuries and less burnout, so a soccer or swim season between cross country seasons is a good thing.
Fun first: programs for kids
- Kids’ fun runs at local races: short, cheap and often with a medal for everyone.
- Girls on the Run: an after-school program for girls in grades 3–8 that uses running and lessons to build life skills, ending the season with a celebratory 5K.
- RRCA Kids Run the Nation: a youth running program and grants for clubs and schools.
- parkrun: free, timed Saturday 5Ks that families can walk or run together, and junior parkrun (a 2K for ages 4–14 on Sunday mornings) where it’s offered.
- Club youth teams: many running clubs have youth cross country and track teams.
School cross country
Cross country is where most kids first race. It’s a fall sport in most states, and one of the biggest in high school: 241,565 boys and 191,733 girls ran it in 2024–25, according to the National Federation of State High School Associations (NFHS).
- Distances: high school varsity races are usually 5,000 meters (3.1 miles). Middle school races are shorter and set by each state: Ohio, for example, caps grades 7–8 at 3,200 meters (about 2 miles).
- Scoring: teams run up to seven; the first five score their place, lowest total wins, and runners six and seven can push other teams back. Every runner matters. Our race rules page explains it.
- Courses: grass, dirt, hills and sometimes mud. Many runners race in spikes or flats; ask the coach before buying.
- Heat: cross country starts in late summer. The National Athletic Trainers’ Association (NATA) and the Korey Stringer Institute recommend that high schools ease athletes into preseason heat over at least 14 days. Send a big water bottle, and treat confusion, collapse or very hot skin as an emergency: call 911.
After high school, the NCAA, NAIA and NJCAA all hold cross country championships. See our running organizations page for how college running is organized.
Health for growing runners
General information, not medical advice. If something hurts, see a pediatrician, sports medicine doctor, physical therapist or the school’s athletic trainer.
- Heel pain (Sever’s disease): the American Academy of Orthopaedic Surgeons (AAOS) says it typically affects active kids aged 9 to 13 in running and jumping sports. It’s an irritated growth area at the back of the heel, and it goes away once the bone matures, but it needs a check-up and a break from pounding while it hurts.
- Overuse injuries: shin pain, knee pain and stress fractures come from doing too much too fast. Stick to the 10% rule, keep easy days easy, and don’t let a child run through pain that changes how they run.
- Eating enough: runners who don’t eat enough for their training can develop Relative Energy Deficiency in Sport (REDs), which the International Olympic Committee says affects boys and girls and raises the risk of bone stress injuries. The AAP advises female athletes to track their periods and see a doctor if they start missing them. Never put a young runner on a diet to get faster.
- Sleep: the CDC recommends 9–12 hours a night for children 6–12 and 8–10 for teens. Early-morning practice plus homework makes that hard, so protect bedtime.
More on prevention and when to see a professional is on our running injuries page, and the after-run routine is on running recovery.
Shoes and gear for kids
Kids need real running shoes that fit, not their brother’s old ones. Kids’ feet grow fast, so check the fit each season: AAOS suggests at least ½ inch between the longest toe and the tip of the shoe, tried on at the end of the day with running socks. The AAP’s running advice is to replace running shoes about every 6 months or 300–500 miles. Add a big labeled water bottle for practice and, for dark fall evenings, something reflective.
Two simple picks: the Nalgene Sustain 32 oz wide-mouth bottle, BPA-free and big enough for a hot preseason practice, and the noxgear Tracer2 light-up vest, which comes in a Small (25–36 in chest) that fits many teens, with up to 20 hours per USB-C charge (about $55 on sale at noxgear). Prices change often; these are what we saw at the maker or a major retailer in October 2026. Full gear advice is on our running gear page.
Nalgene Sustain 32 oz Wide Mouth
- 32 oz, wide mouth
- BPA-free Tritan
- Made with 50% plastic-waste material
noxgear Tracer2 Light-Up Vest
- Small fits 25-36 in chest
- Up to 20 h, USB-C
- 7 oz, IP67
OOFOS OOahh Slide
- OOfoam slide
- APMA Seal of Acceptance
- Machine washable
Parents’ questions about kids’ running
How far can a 10-year-old run?
The RRCA’s guidelines say kids around 8–12 may want to try a 5K. Longer races (10K and up) should wait until after puberty. Let the child set the pace and stop if running stops being fun or starts to hurt.
Can a teenager run a marathon?
The RRCA suggests marathons from about 15–18 and older, while the AAP says children and teens shouldn’t be encouraged to run them. Many marathons have age minimums (Boston’s is 18). If a late teen really wants to, build up slowly with a coach and check with a pediatrician first.
How long is a middle school cross country race?
It depends on the state and the meet, and it is shorter than high school: Ohio, for example, caps grades 7–8 at 3,200 meters. High school races are usually 5,000 meters.
My child has heel pain after practice. What is it?
In active kids around 9 to 13, a common cause is Sever’s disease, an irritated growth area in the heel. It isn’t serious long-term, but have it checked by a pediatrician or sports medicine doctor, and ease off running while it hurts.
Should my child run every day?
No. The AAP recommends one to two days off a week from organized sport, playing more than one sport, and raising mileage by no more than 10% a week.
Back to the running hub, or see race rules and etiquette and running gear. Parents who run will find our recovery for runners guide useful, too.