[2][3] The mountains have also yielded the oldest evidence of Dinosauromorpha, pushing back the evolution of dinosaurs to small, four-legged animals living during the Early Triassic period.

[5] Footprints of early bipedal dinosaurs known as Sphingopus, from 246 million years ago, have also been found.

[6] From the early Middle Ages the mountains were a place of extensive copper and iron mining.

The name "Holy Cross Mountains" refers to a Christian relic from a nearby Benedictine monastery on Łysa Góra, said to be a small piece of wood from the Cross on which Jesus Christ was crucified.

[7] The region saw some significant partisan activity during World War II (see Detached Unit of the Polish Army, Holy Cross Mountains Brigade).

The vegetation period of the highest parts of the mountains is two weeks shorter than in Warsaw and is about 200 days.