Mexican Highlands Gartersnake

Mexican Highlands Gartersnake

Thamnophis pulchrilatus

Silhouette: Alex Slavenko · PhyloPic

LCLeast ConcernNTVUENCR Endemic
Daily sighting probability ~30% · Possible
at Reserva de la Biosfera Mariposa Monarca

In 3 days ~70% in a week ~90%

9 Verified sightings at Reserva de la Biosfera Mariposa Monarca From 2019 to 2026
9 In 1 park
May Best month
☀️ Diurnal When it's spotted

About the Mexican Highlands Gartersnake

The yellow-throated garter snake (Thamnophis pulchrilatus) is a species of snake in the family Colubridae. It is found in Mexico. Very little is known for certain about this snake, but it has been observed to reach lengths of 18–36 in (46–91 cm). They are distinguishable by their characteristic coloring, having a dark brown or black dorsal side accented with a yellow to light green stripe along the spine. A checkered yellow and black pattern can be observed along the sides, and the throat of the snake is bright yellow. Thamnophis pulchrilatus are relatively slender and light snakes.

This species has been considered a synonym of Thamnophis cyrtopsis or of Thamnophis eques. It was first described by Cope in 1885 as Eutaenia pulchrilatus. It is found mainly in wooded areas, specifically oak and pine forests at high elevations, but has occasionally been found in grassy fields as well. Some sources report that they inhabit the southwestern United States, but no sightings have ever been confirmed outside of Mexico, and these U.S. reports are likely T. cyrtopsis or T. eques.

These snakes are believed to eat small... Wikipedia →

Global Distribution

Parks Where Found

# Park Country Daily sighting probability
1 Reserva de la Biosfera Mariposa Monarca 🇲🇽 Mexico
~30%

More parks will be added in future updates.

Cities Where Found

# City Country Daily sighting probability
1 Mexico City 🇲🇽 México
<5%

Before you go

What are the chances of seeing a Mexican Highlands Gartersnake in Reserva de la Biosfera Mariposa Monarca?

Possible

About 30% of wildlife watchers report a Mexican Highlands Gartersnake sighting in Reserva de la Biosfera Mariposa Monarca on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 3rd most-seen of the 6 reptiles we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.

When is the best time to see a Mexican Highlands Gartersnake in Reserva de la Biosfera Mariposa Monarca?

May

In that month about 60% of wildlife watchers report a Mexican Highlands Gartersnake in Reserva de la Biosfera Mariposa Monarca on a given day, against under 5% in June and December–February, the lowest months.

What time of day is best to see a Mexican Highlands Gartersnake?

Between 10 am and 1 pm

Across all the parks we cover, that three-hour window holds the most Mexican Highlands Gartersnake sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.

Where else can you see a Mexican Highlands Gartersnake?

Only Reserva de la Biosfera Mariposa Monarca, in our data

Reserva de la Biosfera Mariposa Monarca is the only park on Wallace's Line with enough records to rate Mexican Highlands Gartersnake sightings: about 30% of wildlife watchers there report one on a given day.

Which relatives of the Mexican Highlands Gartersnake live in Reserva de la Biosfera Mariposa Monarca?

Same family: Colubridae

The closest relatives of the Mexican Highlands Gartersnake that you can see in Reserva de la Biosfera Mariposa Monarca (family Colubridae, Colubrid Snakes) are Mexican Brown Snake (about 40%) and Middle American Gopher Snake (about 30%), with each one's daily chance of a sighting.

Where does the Mexican Highlands Gartersnake sighting chance come from?

GBIF citizen-science records

It is estimated from how often the Mexican Highlands Gartersnake is recorded against all the reptiles logged in Reserva de la Biosfera Mariposa Monarca (9 verified sightings from 2019 to 2026), 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.

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