I emailed my local government to ask about whether it is allowed to walk on the trails at night because the signage at one of the places I like to go during the day says that the trails are only open from sunrise to sunset, and it is apparently a county wide rule.
Rule, yes probably. Actual enforcement is a different matter, and varies a lot. There are places I know are too remote to realistically enforce the rules, because there's no other way to get there but hiking, and local governments aren't likely to be finding money in the budget for patrolling park rangers or cops on those trails every single night.
I find that if a trail is anywhere near a body of water, enforcement is stricter. That's probably because they don't want to be legally responsible in any way for someone drowning in one of their parks.
I hope you find a pleasant place where you can hike in peace!