Hello Dies the park stay open till sunset ? Or does it have a certain time ?

I'd park out on the street just in case. It's the same amount of walking as from the lot and you won't get towed or locked in if you straggle back after sunset

During summertime they close around 830 pm

During normal summers they have programs that last until after dark.

The trials are open from sunrise to sunset. When sunset hits the parking lot is closed by park rangers.

I think it closes at 5 or 5:30. There is no outside lighting since it is a nature preserve. It gets pretty dark there pretty quickly.