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When was the Temple of Hera at Olympia built?

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Map of southeastern Europe highlighting Greece and marking the location of Olympia with a red star, indicating its status as a World Heritage Site. Olympia is shown in the western part of the Peloponnese peninsula, surrounded by neighboring countries and nearby seas including the Ionian, Aegean, and Mediterranean. — Olympia Olympia was declared a UNESCO World Heritage site in 1989.

The existing Temple of Hera at Olympia was likely built about 600 bce.1

While some earlier theories suggested the temple dated to the 11th or 10th century bce, those views are now rejected. The structure may have had an earlier phase without a peristyle (colonnade) that dates back to the 8th century bce.1