Thamnophis ordinoides
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~50% in a week ~80%
The northwestern garter snake (Thamnophis ordinoides) is a species of snake in the family Colubridae. The species is endemic to North America. In the United States, T. ordinoides is found in California, Oregon, and Washington; in Canada, it is found in British Columbia.
The northwestern garter snake is small, with adults averaging around 13–38 in (33–97 cm) in total length (including tail). Its color and scale patterns are varied and can include small dark spots. Common vertebral stripe colors are white, yellow, orange, red, green, turquoise, and blue.
The northwestern garter snake is primarily found on the edges of meadows surrounded by forest, as the species requires a fair amount of sunlight for its survival. In British Columbia it can also be commonly found near bodies of both freshwater and saltwater, where it hunts small fish and amphibians. In scenarios in which it is too hot outside, these snakes can also be found under stumps and rocks in order to shield themselves from the sunlight.
T. ordinoides preys on slugs, salamanders, and frogs. Baird SF, Girard CF (1852). "Descriptions... Wikipedia →
Recording0:01
United States · 2026
© saamde · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Pacific Rim National Park Reserve | 🇨🇦 Canada | |
| 2 | Olympic National Park | 🇺🇸 United States | |
| 3 | Great Bear Rainforest | 🇨🇦 Canada | |
| 4 | Redwood National Park | 🇺🇸 United States |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Oregon Zoo | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Northwestern Garter Snake sighting in Portland on a given day, based on 343 verified sightings from GBIF citizen-science data. It is the most-seen of the 7 reptiles we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
April–June and August–October
In those months about 30% of wildlife watchers report a Northwestern Garter Snake in Portland on a given day, against about 10% in December to February, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Northwestern Garter Snake sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 cities where we can rate Northwestern Garter Snake sightings, Portland has the highest daily chance: about 20%. Next come Seattle (United States, about 20%) and Vancouver (Canada, about 10%).
GBIF citizen-science records
It is estimated from how often the Northwestern Garter Snake is recorded against all the reptiles logged in Portland (343 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
