The registration for the August 2025 SAT opened typically around late April or early May 2025, with some reports pointing to it opening around May 20, 2025. For the August 23, 2025 SAT test date, the regular registration deadline was August 8, 2025, and the late registration deadline was August 12, 2025. Registration for the August SAT usually opens in the spring of the same year, and it's advised to register early as test centers fill up quickly.