Yes, you can keep a grass snake as a pet. They are relatively easy to care for and make great pets for reptile enthusiasts of all levels of experience. When choosing a grass snake as a pet, it is important to select one that is captive-bred, as these snakes are more acclimated to life in captivity than their wild-caught counterparts.
Grass snakes typically reach 2-3 feet in length and have slender bodies with smooth scales. They are found in a variety of colors including green, brown, black and yellow, but the most common color morphs available in the pet trade are albino and amelanistic (lacking black pigment). Grass snakes are semi-aquatic and require both land and water habitats in their enclosure. A simple setup for a grass snake enclosure can include a 10-20 gallon aquarium or plastic storage bin outfitted with a secure lid and small opening for ventilation. The bottom of the enclosure should be lined with an inch or two of dampened sphagnum moss or other substrate that will hold moisture well but not become soggy. A hiding spot such as a hollow log or PVC pipe should be provided, along with a shallow water dish large enough for the snake to soak in but not drown in.
The temperature gradient inside the enclosure should range from 75-85 degrees Fahrenheit during the day, dropping down to 70-75 degrees at night. This can be achieved by using an under tank heater on one end of the enclosure and allowing the other end to cool naturally or by using an adjustable ceramic heat emitter pointed towards one end of the cage (never use hot rocks as they can burn your snake!). UVB lighting is not necessary but can be provided if desired; however, live plants inside the enclosure will help create humidity and provide natural hiding spots while also helping to filter toxins from the air.