Minnesota’s Jeffers Petroglyphs: A 7,000-Year-Old Sacred Site Hidden in the Prairie: As the story develops

Tucked into the tallgrass prairie of Cottonwood County near the small town of Comfrey, a slab of pink Sioux quartzite stretches roughly 50 yards wide and 300 yards long — and its surface holds nearly 5,000 carvings that predate Stonehenge. Jeffers Petroglyphs, located in far southwestern Minnesota, remains one of the least-known sacred sites in North America despite being among the oldest continuously used in the world. Ancestors of today’s Native Americans etched bison, thunderbirds, turtles, and human figures into the rose-colored stone across millennia, and visitors can walk directly up to the ridge and see them. The quartzite itself formed from ancient sand more than 1.6 billion years ago, later polished flat by glaciers into a vast natural canvas. The Minnesota Historical Society acquired the land in 1966 and has managed the site ever since.

The earliest carvings date back roughly 7,000 years, while the most recent Native images were made around the 1760s — a timeline visible in what is and is not depicted on the rock. The atlatl, a notched throwing stick that hunters used to launch spears at bison long before the bow and arrow reached the region, appears more frequently here than almost any other image. The bow didn’t arrive in this part of the plains until about 1,200 years ago, and horses never appear anywhere in the carvings — an absence that signals the site had gone quiet by the late 18th century. Alongside the atlatl, the rock displays elk, deer, salamanders, turtles, and the occasional thunderbird, a powerful spirit figure in Native tradition. Turtles are thought by many Native groups to represent a world beneath the surface, while handprints mark locations where spirits are said to have passed through the stone. Rows of dots, circles, and shapes whose meanings remain undeciphered cover additional sections of the ridge. A natural crack in the quartzite aligns precisely with the summer solstice sunrise and the winter solstice sunset, reflecting sophisticated astronomical knowledge built directly into how the site was used. Lighting matters enormously when visiting: midday sun flattens the surface and makes carvings nearly invisible, while low-angle light at sunrise or sunset fills every groove and brings figures into sharp relief. Guides use mirrors, boards, and water to reveal fainter images, and overcast days offer similarly useful light.

Elders describe the stone as an encyclopedia of Native history and belief, with many images representing prayers, visions, or records of significant events. The site remains actively sacred to the Dakota and other Native nations, and descendants of those who created the carvings continue to hold ceremonies and pray on the rock today.

Beyond the carvings, Jeffers Petroglyphs encompasses 160 acres of native and restored tallgrass prairie that escaped the plow because the shallow, rocky soil made farming impractical. More than 300 plant species thrive across wet, middle, and dry prairie zones that converge in one location due to the site’s varied drainage. Prickly pear cactus grows near the rock while big bluestem grass towers just steps away. Deer, coyotes, lizards called skinks, and dozens of bird species inhabit the grounds, along with the federally threatened prairie bush clover. A buffalo rub stone — a tall, worn rock where bison once scraped off their winter coats — stands along the trail. A gravel path leads from the visitor center to the ridge, with guided tours lasting about 45 minutes covering the carvings, history, and ecology; self-guided options with interpretive signage are also available. The visitor center underwent a full redesign that debuted in summer 2026, adding interactive displays, multimedia exhibits on Native American culture and prairie ecology, and a touchable quartzite slab with a recreated handprint. Sunrise tours have run on select summer Saturdays. Jeffers Petroglyphs is located at 27160 County Road 2 in Comfrey, approximately two hours southwest of the Twin Cities, and opens seasonally from late spring through early fall.