Depends on your definition of "open".
This coming Saturday and again on December 2, DNR is hosting an "open house" to ride the "Red Line" trail (1.4 miles), and the Blue Line Trail (0.6 miles). First come first served, parking limited. For me that would be about a two hour drive, round trip, 20 minutes bs'ing in the parking lot and a generous 15 minutes per lap, probably bored after two laps.
I think I have some chores to do on Saturday, or at least I hope so.
I'd gladly share the newsletter that comes to me via email.