Illinois records
Rough Greensnake in Illinois
HarmlessOpheodrys aestivus

Yes. The Rough Greensnake has been recorded in 30 Illinois counties. It is non-venomous (harmless). Bright green above with a plain pale belly.
Illinois counties with Rough Greensnake records
30 listedSee the full Rough Greensnake profile or all snakes in Illinois.