Yes, you can wait until October 15 to file your CA return.
CA has an automatic extension of 6 months to file. If you owe taxes, you'll need to pay the taxes by April 15. As you are expecting a CA refund, there is no need to tax to pay and you have until October 15, 2026 to file. No extension is required. There is no penalty.
See this CA Revenue document.
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