3:02. Snake Island. Indigo snakes are larger than king snakes.A king snake normally grows 3-4 feet and the maximum length reaching 8-9 feet. Information portal for reptile and amphibian hobbyists offering classifieds, forums, photo galleries, events, business listings and much more for various species The eastern indigo snake is the longest snake in North America and may reach a size of 8.5 ft (2.6 m) and a weight of 11 lbs (5 kg) for males; females are smaller (6.5 ft ( 2 m); 6.5 lbs (3 kg)). I think king snake . Indigo snakes are larger than king snakes.A king snake normally grows 3-4 feet and the maximum length reaching 8-9 feet. January 31. While the large size of the indigo snake is impressive most individuals seen are around 5-6.5 ft (1.5-2 m) in length. The young hatch in September at about 1-foot long. The black rat snake mates in May and lays a dozen or more eggs in July, often in a pile of manure, so the heat from the manure helps incubate the eggs. Giant Cobra lurks in an Old Tarpaulin Warehouse.