Its site was chosen both for its strong natural defences as a high point and for easy access to the sea, which was then much closer to the base of the rock.
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Harlech Castle opening times are"
April - October: Monday - Sunday 9:00 - 5:00
November - March: Monday - Saturday 9:30 - 4:00 and Sunday 11:00 - 4:00
Also Harlech Castle is closed on December 24-26 and January 1st.
The price of admission is £3.70 per adult with family discounts available. I highly recommend the 3-day or 7-day Explorer Pass if you plan on visiting other Cadw properties.