In 2015, the researchers resumed exploration of ash hill 13 on the Western Bilsk hillfort. The excavation trench measuring 141 m2 was placed on the central part of the complex where the cultural layer reached a 0.8 m thick area. In total, almost ten thousand artefacts and ecofacts were collected during the field season.

Dwelling 5 was partly explored. It was an oval pit-house measuring 6.5 × 3.25 m and up to 1.45 m deep. An open fireplace was placed under the western wall at level 1.35 m. The bottom of the dwelling was filled with white ash covered with a layer of white clay. Above the fireplace, the dwelling was filled with ashy mixed soil together with numerous deposits of the artefacts. Handmade pottery, mostly pot rims decorated with punctures, constituted the majority of the finds. The researchers also draw attention to the find of the miniature ritual vessel and Klazomenai amphorae fragments dated by the late 7th – early 6th c. BC.

Near the dwelling, the researchers explored an additional household pit 2 m deep.

Numerous materials were discovered in the cultural layer above the dwelling. Namely, a lot of the Greek amphorae fragments and table wares with red paintings were detected here. A rare find of the black-painted oenochoe fragment with an image of a wild goat is the most notable. Crafts of the local people can be described after the finds of the pieces of iron ores and bronze ingot. Also, diverse objects of everyday use were found here: iron knife and chisel, clay spindle whorls, horn psalia, bone pins and tools for leather currying and trimming. Weapon finds are the bronze arrowheads and bronze armour scale. Also, a semi-finished bone arrowhead was found here.

Several deposits of the animal skeletons were explored in the different areas. These were the parts of the carcases of a sheep, a cow, and a dog. Also, a very interesting find is the fragment of a human skull.

The cultural layer above the dwelling 5 dates by the 6th c. BC.