Unit 20 in Colorado is known for its challenging terrain and limited public land access, particularly around the Rocky Mountain National Park, where hunting is prohibited. Hunters have shared that elk often summer in the park and move to surrounding private lands later in the season, making a guide a valuable resource here. While both archery and rifle seasons offer some opportunities, hunters have expressed that navigating the area's public-private land boundaries is tricky but feasible with the proper maps and tools like OnX maps. Success stories often involve significant pre-season scouting and detailed understanding of the unit's terrain and boundaries, emphasizing the importance of preparation to have a rewarding experience.