The Plains black-headed snake (Tantilla nigriceps) is a species of snake of the family Colubridae.
The Plains black-headed snake is often secretive and can be found seeking refuge in leaf-litter or in small burrows, while being surface active at night. It has been collected from February into September in Arizona, but most are found in August. It is susceptible to desiccation and unlikely to be found surface active or under surface debris in dry periods or seasons.
They are often found in rocky or grassy prairies, or hillsides here they soil is moist. Occasionally they are found in basements.
The snake is found in the US states of Colorado, Texas, Kansas, Nebraska, Oklahoma, and New Mexico and in Mexico.