A small colubrid like that was probably in brumation(the reptile version of hibernation). He more than likely would have survived in the cold weather but if you want a new pet for awhile it won't hurt him to take him out of brumation as long as it is done slowly. Give him a solid chance to warm up too before offering food.
Edit: to the best of my knowledge it won't eat insects or invertebrates. Fish, mice pinks, and amphibians make up the vast majority of a baby's diet.
I like my Dubstep to go Wop Wop Wop Wop