Common Garter Snake
Thamnophis sirtalis
- KingdomAnimalia (Animals)
- PhylumChordata (Cordats)
- ClassSquamata
- FamilyColubridae (Colúbrids)
- GenusThamnophis (Garter Snakes)
- SpeciesThamnophis sirtalis (Common Garter Snake)
Closest Relatives at Channel Islands National Park
Two-striped Garter Snake
Thamnophis hammondii
Western Terrestrial Garter Snake
Thamnophis elegans
Gopher Snake
Pituophis catenifer
Striped Racer
Masticophis lateralis
Ringneck Snake
Diadophis punctatus
Coachwhip
Masticophis flagellum
California King Snake
Lampropeltis californiae
California Mountain Kingsnake
Lampropeltis zonata
North American Racer
Coluber constrictor
📅 Monthly Probability
Fewer than 5 records of Common Garter Snake at Channel Islands National Park — not enough to chart months honestly.
☀️ When They're Spotted
Most active during daytime hours (6am–6pm) · across all parks (global)
Global Distribution
Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.
where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is) · parks where it occurs — tap a pin for the sighting probability there