Fall is not free of high school rugby.
Girls rugby, especially, gets a boost in the fall, both in 7s and (in some small examples) 15s.
This is not an exhaustive list, but it does give you an idea of what's going on this fall.
Interestingly, it's worth noticing that several of the states with fall 7s rate quite high when it comes to membership compared to youth population. In the Top 20 we listed here: Youth and HS Membership Numbers and Analysis—half of them have robust fall schedules.
Oregon:
Their fall 7s include both boys and girls teams. They didn't have a lot of teams last year, but they can grow.
Idaho:
Idaho is #1 in terms of members as a proportion of the youth population. The Idaho girls 7s competition is split into West ADA (Boise) and the rest of the state. It's one of the best leagues in the nation.
Utah:
While girls rugby takes something of a center stage in 7s in the fall, the boys also play a fairly robust series of games. They start on September 16 and play a few weeks.
Colorado:
The CIRA season is building back into a solid group of teams and will play a girls 7s season this fall. Summit, Regis Jesuit, Monarch, East, Eagle Valley and, we expect, Palmer, will be in this league.
Iowa:
The girls league is the central thing in the fall with 12 school teams playing throughout the fall. By playing on a Monday evening, the league allows teams to find field space and also allow athletes to perhaps play two sports during the fall. First tournament is Monday, September 18.
Indiana:
Boys and girls have a robust schedule that kicks off September 17 and goes each successive Sunday into the middle of October. By out count there are 11 HS teams in boys and 11 HS teams in girls (several of these teams have more than one side fielded). Also in the USA Youth & HS numbers we saw that Indiana has a solid showing in relation to their youth population. Indiana is
Wisconsin:
The girls 15s league is held each fall with about 10 teams.
Michigan:
A seven-team 15s league kicks off later this month.
Ohio:
Ohio's membership density is high, and in total numbers, too, as they rate 3rd in total members behind Southern California and Northern California. A really strong 7s competition is part of that, as it's a great way for teams (school teams and HS clubs) to introduce the game to new players during the fall.
Their league kicks off September 24 and they move on through to a finals around the end of October.