California Retaining Walls Found A Very Tiny Snake What Kind Is It?

Found a very tiny snake what kind is it? - california retaining walls

We live in the mountains of northern California and found a snake, the length of a pencil and a rainbow of colors. It was noted that starting with the use of a tractor on a bench. Rosy Boa possible, the kind of psychedelic colors. All ideas of what is and what you eat?