First mx track

IDK, but Byron IL has got to be in the running for the title.

I raced Byron in the early 70s.

Nor Cal wise Argyle has to be right up there, late 60s I believe.

peperell massholechusetts

I think byrons first race was in 1969. Might not be the first in the U.S. but it's got to be in the Midwest. The best part is there still going strong and growning.

Don't know but Bithlo Mx in Florida has been around since the 70's. I started riding there in 77 when I was 6.

Northern California, Carnegie has been an off-road place since the 60's, not sure when local races started but I believe the Inter-Am may have run there. Trans-AMAs since the first year (?).
I think Argyll opened in the 70's.
McGill's (Prarie City) since 72-23, there was an Inter-Am race near there but not where the park is now.

First Inter-Am race's were in 1967, not sure if there were much if any races called "MX" or "rough scrambles" before Edison Dye brought MX to the US (in a big way).

Unadilla 1972 inaugural AMA Pro Motocross Championship

Arroyo Cycle Park might have been late 60s, I think they have a race or two this summer.

My guess is somewhere in Pennsylvania.

Guarantee DC knows this

OMC in Boise Idaho has been a track forever.

Capeway rovers, middleboro Massachusetts

Walden MX in Wallkill NY ????

This from Inter-Am Motocross history on Facebook. Hello everyone, I hope you are enjoying this as much as I have putting it together. I am almost ready to start 1970 but I am still trying to complete the 67-69 looking for anything on the Inter-Am at Pepperell 1967 , Sedan, Kansas Nov 5th 1967 and Seattle, WA Dec 3rd.1967 and Wichita KS Nov. 2 1968.

Tracks that are still in operation that have seen the test of time. Owyhee in Boise, Jeeps in Wichita have been around since the late 60's? Maybe longer. I've seen a poster for the Sedan, Ks Inter-Am. I did not know Wichita had an early Inter-Am also. I wonder if it was at the old Sprockets track in Rose Hill?

Puyallup Washington, early 70's, with a rubber band start.

Central village Connecticut has been running since 1967, cape way since 1934, clearly not MX but off road races

I think cape way was built in the late 50s.

Yeah I knew Capeway had been around forever...NESC started in the 50s, IIRC.

I think so too, it has I sign that says founded in 1934, but maybe as a motorcycle club, NESC has been around since 1958, capeway and central village are still running races