Opheodrys vernalis
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~20% in a week ~40%
The smooth green snake (Opheodrys vernalis) is a species of North American nonvenomous snake in the family Colubridae. The species is also referred to as the grass snake. It is a slender, "small medium" snake that measures 36–51 cm (14–20 in) as an adult. It gets its common name from its smooth dorsal scales, as opposed to the rough green snake, which has keeled dorsal scales. The smooth green snake is found in marshes, meadows, open woods, and along stream edges, and is native to regions of Canada, the United States, and northern Mexico. A non-aggressive snake, it seldom bites and usually flees when threatened. It mates in late spring to summer, and females lay their eggs from June to September. The smooth green snake will often bob its head in order to mimic vegetation blowing in the wind.
The smooth green snake is slender. In size, it is classified as a "small medium" snake, reaching to 36–51 cm (14–20 in) in total length (including tail) as an adult. The longest smooth green snake was measured as being 66 cm (26 in) in total length. The tail makes up about 1/4 to 1/2 the total length of the snake; males have longer tails than females.
It is uniform light green... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States | |
| 2 | Cape Breton Highlands National Park | 🇨🇦 Canada | |
| 3 | Shenandoah National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Toronto | 🇨🇦 Canada |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Ecomuseum Zoo | 🇨🇦 Canada | |
| 2 | Toronto Zoo | 🇨🇦 Canada |
With luck
About 10% of wildlife watchers report a Smooth Greensnake sighting in Shenandoah National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 18th most-seen of the 20 reptiles we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
August
In that month about 20% of wildlife watchers report a Smooth Greensnake in Shenandoah National Park on a given day, against under 5% in June–July, September and November–March, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Smooth Greensnake sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 3
Of the 3 parks where we can rate Smooth Greensnake sightings, Shenandoah National Park ranks 3rd at about 10%. The best odds are in Acadia National Park (United States, about 20%) and Cape Breton Highlands National Park (Canada, about 20%).
GBIF citizen-science records
It is estimated from how often the Smooth Greensnake is recorded against all the reptiles logged in Shenandoah National Park (10 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.
