2257 was, on Earth's calendar, the 58th year of the 23rd century, and the eighth year of the 2250s decade. Besides this time period's Human dates, in stardates this era begin with stardate 2257.0.
- A USS Farragut survey mission, and later the ship herself, are attacked by a dikironium cloud creature on Tycho IV. Some 200 crew, including Captain Stephen Garrovick, are killed. Lieutenant James T. Kirk assumes command and sets a course for the nearest starbase. 
- Teressa Allis, age 26, is elected as First Citizen of Merope IV. Allis still holds the position in 2267.
- The USS Discovery returns from the mirror universe 9 months after their victory at Pahvo.
- Commander Saru leads the Discovery on a mission to Qo'noS. The mission that results in the end of the Federation-Klingon War, a cease fire between the Federation and Klingon Empire, and Saru and many of the crew members receiving the Starfleet Medal of Honor. The Discovery, en route to pick up a new commanding officer in the Vulcan system, but stop along the way to respond to a distress call from Captain Christopher Pike aboard the USS Enterprise.
- Nyota Uhura begins attending Starfleet Academy.
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