Greenland Open Space near Larkspur now sits beside North America's largest wildlife overpass

South of Larkspur, where the prairie opens up between the buttes, Douglas County keeps a former cattle ranch as open space. Greenland is wide and quiet. The main loop runs about ten miles over gentle grassland with long views, and it carries the Colorado Front Range Trail, the regional route that links Larkspur and Palmer Lake. Hikers, mountain bikers, and riders on horseback all share it.

This is working pronghorn, elk, and mule deer country, and it just gained a striking new neighbor. In December 2025, CDOT finished the I-25 Greenland wildlife overpass a short distance east, a grass-topped bridge the agency describes as the largest in North America. It measures 200 feet wide and 209 feet long and reconnects 39,000 acres of habitat between Larkspur and Monument. CDOT expects it to cut wildlife-vehicle crashes there by about 90 percent, on a stretch that had averaged roughly one a day during spring and fall migration.

You won’t walk across the overpass itself, but standing on the open space you can read the same landscape the animals do: the grass corridor the herds follow toward the foothills. It’s a rare chance to see big-picture conservation and a morning hike in one place.

For trail maps, hours, and the dog-park rules, check the Douglas County Greenland Open Space page before you go.