There are 22 former lookout sites registered in Colorado. The most recently registered former lookout site is Mount Evans Lookout Site (US 1545, CO 22), added on December 12, 2013.
| Lookout Name | NHLR Registry Number | Available for Rental | Visit Reports |
| Academy Lookout Site | US 1143, CO 20 | ||
| Alta Mine Tower Site | US 529, CO 1 | ||
| Badger Mountain Tower Site | US 530, CO 2 | ||
| Baldy Mountain Tower Site | US 531, CO 3 | ||
| Beaver Mountain Tower Site | US 532, CO 4 | ||
| Blue Mountain Tower Site | US 533, CO 5 | ||
| Burro Peak Tower Site | US 534, CO 6 | ||
| Castle Peak Lookout Site | US 1139, CO 18 | ||
| Chimney Rock Lookout Site | US 1085, CO 16 | ||
| Crown Point Lookout Site | US 1138, CO 17 | ||
| Devil Mountain Lookout Site | US 1144, CO 21 | ||
| Eagles Nest (McPhee) Tower Site | US 535, CO 7 | ||
| Glade Mountain Tower Site | US 536, CO 8 | ||
| Lookout Mountain Tower Site | US 537, CO 9 | ||
| Monarch Lookout Site | US 1140, CO 19 | ||
| Mount Evans Lookout Site | US 1545, CO 22 | ||
| Narraguinnep Tower Site | US 538, CO 10 | ||
| Owl Mountain Tower Site | US 539, CO 11 | ||
| Thorodin Tower Site | US 540, CO 12 | ||
| Twin Sisters Tower Site | US 541, CO 13 | ||
| Wallace Park Tower Site | US 543, CO 15 | ||
| West White Pine Mountain Tower Site | US 542, CO 14 |