The Ilumetsa site, in Estonia, consists of two round, rimmed structures that are 725 m apart. We excavated trenches though the Ilumetsa Large and Ilumetsa Small structures and found small pieces of charcoal within the putative proximal ejecta in both structures, in a similar geological setting as previously identified charcoal in Kaali and Morasko craters. 14C dating of charcoal showed that these crater-like features formed simultaneously between 7170 and 7000 cal. years BP, about 7 ka after deglaciation of this area. A ground penetrating radar survey shows that no additional Ilumetsa structures >40 m exist. Geochemical studies of the ejecta and a search using a metal detector did not reveal any clear indication of extraterrestrial material. This suggests Ilumetsa may have been formed by an impact of stony-iron or stony body, which got significantly weathered in a wet-temperate climate. The mystery of the formation of the structures at Ilumetsa remains; however, due to significant circumstantial evidence discussed herein, we are confident to call it a “probable” impact site.