According to TechFlow’s official Twitter account, the dYdX private testnet will start on March 28, 2023 and last for 2-3 weeks.

Additionally, dYdX has now completed the technical implementation of the milestone, and a limited number of validators will verify the functionality of this initial external testnet. After identifying key pain points and areas for improvement, it will continue to move forward with the completion of Milestone 4, which includes the launch of the public testnet, and the final Milestone 5 will include the launch of the mainnet blockchain. Original link