"After Dark" rules?

[Geek]

I want to do some night riding.

Many places I've visited (like Heil Ranch) have signs that say parking is open from sunrise to sunset. Does that mean I cannot ride Heil at night?
Can I park out in LHC and then bike up and into Heil at night legally?

Are these type of rules enforced?

thanks in advance.
Ed

[Debaser]

Boulder County Open Space is closed at night. Boulder City Open Space is okay. USFS trails are okay.

Best to check with the managing agency's website to see when you can be there.