https://washingtonleague.org/ Washington State has a league for youth. Mountain biking is very popular in our state. There is a team at our local schools. With the schools mostly closed, I still see the kids in groups riding the trails. Most are on full suspension bikes of name brands. I donated my last mtb to the school program.
That's great to see , and for a population of 7.5 m it looks like they had about 600 attend the state champs!
My bet is the US kids nationals attracts more than the 2500 riders Show Low claim to be the largest us mtb event?
Both our junior and senior schools have a VERY basic mtb program - old donated bikes, the kids who struggle in class have a program where they fix up old bikes so even the worst land fill candidate can be used as parts. No dual suspension bikes , in fact most of the bikes don't even have disc brakes. But when you have 25 kids out riding the trails they're all smiling.( and usually learning bush mechanic skills...)
My daughters group were the first to put together a team for the nationals - 5 boys and her. One was riding a 10 year old x country bike. It's a small country town (4500 population) , but they lined up against schools with dedicated coaches and team bikes! I particularly love this photo - all the other kids are wearing dedicated mtb gear, Lenny is in a flannel shirt, a borrowed helmet and borrowed knee guards - great kid. https://outerimage.com.au/events/th...63a822#photo=d82244a2e1ae20f332d82e1b22875563
I worry about what emtb will do to school programs in 3/4 years. All 3 of my kids worked their way up through my old mtb's , but I can't see my full e providing that role - it'll likely retire with a terminal electromechanical failure but the parts aren't likely to transplant well into a regular bike.