The accident happened around 1:55am Friday on the Intertstate 45 northbound frontage road just north of Rayford Road in Montgomery County.
According to the Texas Department of Public Safety, the victim was riding his bike when an unidentified vehicle struck him and fled the scene.
The victim was transported to Memorial Herman Hospital in The Woodlands. At last check, he was in critical condition.
Anyone with information about this crime is urged to call DPS at 281-297-6590.