Genus

Garter Snakes

Thamnophis

16 species in our catalog · found in 40 parks

KingdomAnimalia (Animals)
PhylumChordata (Chordates)
ClassSquamata
FamilyColubridae (Colubrid Snakes)
GenusThamnophis (Garter Snakes)

Species in this group

Each card shows the species at its best park — tap for the full profile

Thamnophis sirtalis

Daily sighting probability ~80% · Very likely

Thamnophis radix

Daily sighting probability ~40% · Likely

Thamnophis elegans

Daily sighting probability ~40% · Likely

Thamnophis ordinoides

Daily sighting probability ~40% · Likely

Thamnophis saurita

Daily sighting probability ~30% · Possible

LC Endemic

Thamnophis couchii

Daily sighting probability ~30% · Possible

Thamnophis proximus

Daily sighting probability ~20% · Possible

LC Endemic

Thamnophis pulchrilatus

Daily sighting probability ~20% · Possible

LC Endemic

Thamnophis atratus

Daily sighting probability ~20% · Possible

LC Endemic

Thamnophis scalaris

Daily sighting probability Insufficient data

Thamnophis cyrtopsis

Daily sighting probability Insufficient data

VU Endemic

Thamnophis scaliger

Daily sighting probability Insufficient data

Thamnophis marcianus

Daily sighting probability ~10% · With luck

EN Endemic

Thamnophis melanogaster

Daily sighting probability Insufficient data

Thamnophis eques

Daily sighting probability Insufficient data

Thamnophis hammondii

Daily sighting probability ~10% · With luck

See all 16 species Show fewer

Daily sighting probability by month

Probability-weighted average across the group's species

~10%

Jan

~20%

Feb

~20%

Mar

~30%

Apr

~30%

May

~30%

Jun

~40%

Jul

~40%

Aug

~40%

Sep

~30%

Oct

~20%

Nov

~20%

Dec

When they're spotted

When the group's species are recorded (aggregated)

Where to see Garter Snakes

Worldwide records of this group (human observations from 2019 onwards, GBIF). Pins mark our parks — tap one for the chance of seeing at least one species of the group there.

Parks Ranked

Chance of seeing at least one species of the group · number of its species present

#	Park	Country	Species	Daily sighting probability
1	Wood Buffalo National Park	🇨🇦 Canada	1	~80%
	Common Garter Snake			~80%
2	Redwood National Park	🇺🇸 United States	4	~70%
	Common Garter Snake			~40%
	Western Terrestrial Garter Snake			~20%
	Aquatic Garter Snake			~20%
	Northwestern Garter Snake			~20%
3	Cape Breton Highlands National Park	🇨🇦 Canada	1	~70%
	Common Garter Snake			~70%
4	Pacific Rim National Park Reserve	🇨🇦 Canada	3	~60%
	Common Garter Snake			~40%
	Northwestern Garter Snake			~40%
	Western Terrestrial Garter Snake			Insufficient data
5	Isle Royale National Park	🇺🇸 United States	1	~60%
	Common Garter Snake			~60%
6	Point Pelee National Park	🇨🇦 Canada	1	~60%
	Common Garter Snake			~60%
7	Reserva de la Biosfera Mariposa Monarca	🇲🇽 Mexico	5	~50%
	Mexican Highlands Gartersnake			~20%
	Longtail Alpine Garter Snake			Insufficient data
	Short-tail Alpine Garter Snake			Insufficient data
	Blackbelly Garter Snake			Insufficient data
	Mexican Gartersnake			Insufficient data
8	Sequoia and Kings Canyon National Parks	🇺🇸 United States	2	~50%
	Western Terrestrial Garter Snake			~30%
	Western Aquatic Garter Snake			~30%
9	Voyageurs National Park	🇺🇸 United States	1	~50%
	Common Garter Snake			~50%
10	Acadia National Park	🇺🇸 United States	1	~50%
	Common Garter Snake			~50%
11	Big Cypress National Preserve	🇺🇸 United States	2	~50%
	Ribbon Snake			~30%
	Common Garter Snake			~20%
12	Elk Island National Park	🇨🇦 Canada	2	~50%
	Plains Garter Snake			~40%
	Common Garter Snake			Insufficient data
13	Olympic National Park	🇺🇸 United States	3	~50%
	Northwestern Garter Snake			~30%
	Common Garter Snake			~20%
	Western Terrestrial Garter Snake			~10%
14	Great Bear Rainforest	🇨🇦 Canada	3	~40%
	Common Garter Snake			~20%
	Northwestern Garter Snake			~20%
	Western Terrestrial Garter Snake			~10%
15	Shenandoah National Park	🇺🇸 United States	2	~40%
	Common Garter Snake			~40%
	Ribbon Snake			Insufficient data
16	Great Smoky Mountains National Park	🇺🇸 United States	1	~40%
	Common Garter Snake			~40%
17	Grand Teton National Park	🇺🇸 United States	2	~40%
	Western Terrestrial Garter Snake			~40%
	Common Garter Snake			~10%
18	Glacier National Park	🇺🇸 United States	2	~40%
	Western Terrestrial Garter Snake			~30%
	Common Garter Snake			~10%
19	Yosemite National Park	🇺🇸 United States	3	~40%
	Western Terrestrial Garter Snake			~20%
	Western Aquatic Garter Snake			~20%
	Common Garter Snake			~10%
20	Badlands National Park	🇺🇸 United States	2	~40%
	Plains Garter Snake			~30%
	Common Garter Snake			Insufficient data
21	Yellowstone National Park	🇺🇸 United States	2	~40%
	Western Terrestrial Garter Snake			~30%
	Common Garter Snake			Insufficient data
22	Rocky Mountain National Park	🇺🇸 United States	1	~30%
	Western Terrestrial Garter Snake			~30%
23	Zion National Park	🇺🇸 United States	1	~30%
	Western Terrestrial Garter Snake			~30%
24	Riding Mountain National Park	🇨🇦 Canada	2	~30%
	Plains Garter Snake			~30%
	Common Garter Snake			Insufficient data
25	Everglades National Park	🇺🇸 United States	2	~30%
	Ribbon Snake			~20%
	Common Garter Snake			~20%
26	Palo Verde National Park	🇨🇷 Costa Rica	1	~30%
	Western Ribbon Snake			~30%
27	Big Bend National Park	🇺🇸 United States	2	~20%
	Black-necked Gartersnake			~20%
	Checkered Garter Snake			~10%
28	Banff National Park	🇨🇦 Canada	2	~20%
	Western Terrestrial Garter Snake			~20%
	Common Garter Snake			~10%
29	Arrecifes de Cozumel National Park	🇲🇽 Mexico	1	~20%
	Western Ribbon Snake			~20%
30	Saguaro National Park	🇺🇸 United States	2	~20%
	Black-necked Gartersnake			~20%
	Checkered Garter Snake			~10%
31	Congaree National Park	🇺🇸 United States	1	~20%
	Common Garter Snake			~20%
32	Jasper National Park	🇨🇦 Canada	2	~20%
	Western Terrestrial Garter Snake			~10%
	Common Garter Snake			~10%
33	Guadalupe Mountains National Park	🇺🇸 United States	1	~20%
	Black-necked Gartersnake			Insufficient data
34	Grand Canyon National Park	🇺🇸 United States	2	~10%
	Western Terrestrial Garter Snake			~10%
	Black-necked Gartersnake			Insufficient data
35	Channel Islands National Park	🇺🇸 United States	3	~10%
	Two-striped Garter Snake			~10%
	Western Terrestrial Garter Snake			Insufficient data
	Common Garter Snake			Insufficient data
36	Sian Ka'an Biosphere Reserve	🇲🇽 Mexico	1	~10%
	Western Ribbon Snake			Insufficient data
37	Lago de Yojoa	🇭🇳 Honduras	1	~10%
	Checkered Garter Snake			Insufficient data
38	Celestún Biosphere Reserve	🇲🇽 Mexico	1	~10%
	Western Ribbon Snake			Insufficient data
39	Gros Morne National Park	🇨🇦 Canada	1	~10%
	Common Garter Snake			Insufficient data
40	Joshua Tree National Park	🇺🇸 United States	1	<5%
	Two-striped Garter Snake			Insufficient data