Chevrolet has offered green as a paint color for Corvettes across several years and generations. There isn't a single range of years where *only* green Corvettes were made. To get a precise answer, you'd need to specify *which* shade of green (there have been many!).
To find out the years a specific shade of green was offered, you would need to consult a Corvette color chart or a Corvette history resource specific to the model year you're interested in.
