The visitor center is open from 8:30 to 4, and closed for the lunch hour.
From the website: HOURS OF OPERATION Radnor Lake is a day-use park. 6:00 AM to Sunset - Daily VISITOR CENTER 9:30 AM to 6:00 PM - Thursday - Monday Closed - Tuesday and Wednesday *Visitor Center is closed from 1:00 PM to 2:00 PM for lunch
Sunrise to sunset.
I think it's like 9am to 5pm
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