Search for "average pitching speed by age" and you'll get a dozen confident tables telling you a 12-year-old should throw 55 mph. Almost none of them say where the number came from. Before you let one of those tables set expectations for your child, it's worth understanding what data actually exists.
There is no comprehensive public dataset of youth pitching velocity. What exists are samples, and each sample has a bias baked into it:
One of the more transparent published analyses comes from Driveline Baseball, which looked at velocity aging curves across roughly 100 athletes in the first year of its academy programme, measured across bullpens, live at-bats and games.
What it reported is worth reading carefully, because it isn't a benchmark table — it's a rate of change:
| Age band | Reported average fastball velocity gain |
|---|---|
| 9U–11U | roughly 5 mph per year |
| 14U–16U | roughly 3 mph per year |
And the authors are explicit about the limits: the data "does not apply to all youth players — only the ones that we had in our Academy in our first year." They also note that a player's numbers at any age mix physical maturity with technical skill, so a late-developing player can look worse than their actual ability.
That caveat is the most useful sentence in the whole subject. The honest takeaway isn't a target number — it's that young arms and bats typically gain a few miles per hour a year, and the rate slows as players get older.
The genuinely correct answer is: faster than they did last year, with mechanics that don't hurt, inside a workload their arm can handle. Any specific number you're given is either a sample from a group your child isn't in, or an invention.
What matters far more at that age than the radar reading:
Exit velocity — how fast the ball leaves the bat — has the same sampling issues, plus one extra trap. Most published youth exit-velocity figures are maximum readings off a tee, which run considerably higher than what a player produces against live pitching, where timing is the limiting factor.
So if a chart says 12U players hit 65 mph and your child reads 55 in a game, you may be comparing a tee maximum with a game average. Those are different measurements.
If you have access to a device that measures it, the useful practice is simple: measure the same way, in the same setting, a few times a season, and watch your own player's line move. A number you can compare with itself beats a number from someone else's sample.
Four things that are measurable, comparable and actually yours:
MyBallPlayer charts all four together, so a jump in throwing speed sits next to the growth spurt that produced it. That's a far more honest picture of development than measuring a child against a stranger's chart.
There is no trustworthy universal answer, because published youth velocity data comes from self-selected groups such as showcase attendees or training-academy athletes. Track your own player's change over time instead, and prioritise pitch-count limits, rest and strike-throwing over the radar reading.
No comprehensive public dataset exists. The most transparent published analysis, from Driveline Baseball's academy athletes, reported average gains of roughly 5 mph per year at 9U–11U easing to about 3 mph per year at 14U–16U — a rate of improvement rather than a benchmark, and explicitly limited to their own athletes.
Be careful comparing figures: most published youth exit-velocity numbers are maximum readings off a tee, which are well above what the same player produces against live pitching. Measure your own player consistently in the same setting and watch the trend.
Much less than parents expect. At youth level, walks and defence decide far more games than fastball velocity, and workload management matters more for a young pitcher's future than adding a mile per hour this season.
Little League® limits league ages 11–12 to 85 pitches in a day, and Pitch Smart publishes the same 85-pitch daily maximum for ages 11–12, with required rest days that increase with the pitch count. Always follow your own league's current rulebook.