San Francisco Garter Snake (Thamnophis sirtalis tetrataenia) are isolated a small portion of San Mateo County and southern San Francisco. Essential habitat for breeding populations to occur includes open grass uplands and shallow marsh lands with adequate emergent vegetation, and the presence of Pacific tree for (Pseudacris regilla) and California reg-legged frog (Rana draytonii) breeding populations. Reference

Federal Status


California Status


Survey Protocol

Home Range

Map Data Source: home range adapted from USFWS 2006 (above) and

Photo credits: header (cropped) – J. Maughn on Flickr, featured image – J. Maughn on Flickr