Beginning February 11, 2019, BART will shift its start of service from 4am to 5am on weekdays to allow extra time for a critical seismic retrofit of the Transbay Tube. This change will last for the duration of the 3.5 year-long project.
Alternative bus service will be provided by several Bay Area bus operators, including County Connection. See below for a map of all Early Bird Express routes. County Connection will operate two routes, Routes 712 and 715, serving BART stations within Central Contra Costa.
Visit the BART website for more information: https://www.bart.gov/schedules/early-bird-express