Arapahoe Basin, CO
Opened Friday 10/19 with 4 features.

Killington, VT
Opened Friday, 10/19. I don’t have the park setup for Killington, but if you were there, it’s be really sick if you entered the features in Ullr
Tyrol Basin, WI
Pre-season hike park on Sunday, 10/21 with 6 features.

If you want to check out the park setups in more detail or enter your mountain, check out the app at ullr.ski.
Did I miss any? What mountain has the best pre-season park?