| Name on the Register | Date listed | Site Numbrer | Location of property | Description | |
| Aggie “A” | Sep 13, 1995 | (#5LR.472) | Vicinity of Road 42C, near Horsetooth Reservoir | Fort Collins | The Aggie “A” is associated with the history of Colorado State University, the former Colorado Agricultural College. The 1923 “A” is an example of hillside monograms which are distinctive landmarks in western states. |
| Ammons Hall | 15-Jun-1978 | (#78000864) | Colorado State University campus | Fort Collins | |
| Peter Anderson House | 25-Oct-1979 | (#79000614) | 300 S. Howes St. | Fort Collins | |
| Armstrong Hotel | 31-Aug-2000 | (#00001002) | 249-261 S. College Ave. | Fort Collins | |
| Arrowhead Lodge | 27-May-1992 | (#92000502) | 34500 Poudre Canyon Highway in the Roosevelt National Forest | Bellvue | |
| Avery House | 24-Jun-1972 | (#72000274) | 328 W. Mountain Ave. | Fort Collins | |
| Baker House | 20-Jul-1978 | (#78000866) | 304-304½ E. Mulberry St. | Fort Collins | |
| Baldpate Inn | 11-Jan-1996 | (#95001510) | 4900 S. State Highway 7 | Estes Park | |
| Bear Lake Comfort Station | 29-Jan-1988 | (#87001137) | Bear Lake | Estes Park | |
| Bee Farm | 25-Nov-2002 | (#02001409) | 4320 E. County Road 58 | Fort Collins | |
| A. S. Benson House | 6-Jan-2004 | (#03001362) | 463 W. 5th St. | Loveland | |
| Big Thompson River Bridge III | 15-Oct-2002 | (#02001139) | U.S. Highway 34 at milepost 85.15 | Loveland | |
| Big Thompson River Bridge IV | 15-Oct-2002 | (#02001140) | U.S. Highway 34 at milepost 86.04 | Loveland | |
| Bimson Blacksmith Shop | 23-Jul-1981 | (#81000185) | 224 Mountain St. | Berthoud | |
| Bingham Homestead Rural Historic Landscape | 16-Apr-2013 | (#13000161) | 4916 Bingham Hill Rd. | Bellvue | |
| Maude Stanfield Harter Borland House | 6-Jul-2004 | (#04000662) | 610 N. Jefferson Ave. | Loveland | |
| Botanical and Horticultural Laboratory | 18-Sep-1978 | (#78003395) | Colorado State University campus | Fort Collins | Now called Routt Hall. |
| Jay H. Bouton House | 18-Dec-1978 | (#78000867) | 113 N. Sherwood St. | Fort Collins | |
| Buckeye School | 26-Jun-2008 | (#08000599) | Off W. County Road 80 | Wellington | |
| Chasteen’s Grove | 6-Sep-1978 | (#78000872) | West of Loveland off U.S. Highway 34 | Loveland | |
| Clatworthy Place | 14-Jul-2004 | (#04000681) | 225 Cyteworth Rd. | Estes Park | |
| Colorado and Southern Railway Depot | 14-Jun-1982 | (#82002303) | 405 Railroad Ave. | Loveland | |
| Crags Lodge | 1-Jul-1998 | (#98000814) | 300 Riverside Dr. | Estes Park | |
| Downtown Loveland Historic District | 1-Jun-2015 | (#15000281) | Roughly bounded by Railroad & Jefferson Aves., alleys between 3rd & 4th Sts. & 4th & 5th Sts. | Loveland | |
| East Longs Peak Trail-Longs Peak Trail-Keyhole Route-Shelf Trail | 10-Jul-2007 | (#07000740) | West of State Highway 7 | Allenspark | Extends into Boulder County. |
| Edgemont | 15-Jul-1998 | (#98000853) | 1861 Mary’s Lake Rd. | Estes Park | |
| Elkhorn Lodge | 27-Dec-1978 | (#78000862) | 530 W. Elkhorn Ave. | Estes Park | |
| Fall River Entrance Historic District | 29-Jan-1988 | (#87001139) | Fall River Entrance | Estes Park | Boundary increase approved March 5, 2018. |
| Fall River Pass Ranger Station | 29-Jan-1988 | (#87001140) | Fall River Pass | Estes Park | |
| Fall River Pump House and Catchment Basin | 30-Aug-2006 | (#06000735) | Near the top of Fall River Road in Rocky Mountain National Park | Estes Park | |
| Fall River Road | 20-Jul-1987 | (#87001129) | Fall River Rd. | Estes Park | Boundary increase approved May 21, 2018 |
| Fern Lake Patrol Cabin | 29-Jan-1988 | (#87001142) | Fern Lake | Estes Park | |
| Fern Lake Trail | 28-Feb-2005 | (#05000074) | Rocky Mountain National Park | Estes Park | |
| First National Bank Building | 10-Aug-2000 | (#00000937) | 3728 Cleveland Ave. | Wellington | |
| First United Presbyterian Church | 7-Jul-2004 | (#04000664) | 400 E. 4th St. | Loveland | |
| Flattop Mountain Trail | 27-Sep-2007 | (#07000999) | Rocky Mountain National Park[7] | Estes Park | |
| Jacob and Elizabeth Flowers House | 1-Mar-2007 | (#07000086) | 5200 W. County Road 52E | Bellvue | |
| Fort Collins Armory | 15-Oct-2002 | (#02001133) | 314 E. Mountain Ave. | Fort Collins | |
| Fort Collins Municipal Railway Birney Safety Streetcar No. 21 | 5-Jan-1984 | (#84000860) | 1801 W. Mountain Ave. | Fort Collins | |
| Fort Collins Post Office | 30-Jan-1978 | (#78000868) | 201 S. College Ave. | Fort Collins | Now used as the Ft. Collins Museum of Contemporary Art |
| Montezuma Fuller House | 15-Dec-1978 | (#78000869) | 226 W. Magnolia St. | Fort Collins | |
| Gem Lake Trail | 29-Jan-2008 | (#07001473) | North of Devils Gulch Rd. to Gem Lake[8] | Estes Park | |
| Glacier Basin Campground Ranger Station | 20-Jul-1987 | (#87001143) | Glacier Basin | Estes Park | |
| Graves Camp Rural Historic District | 14-Dec-2016 | (#16000155) | Five miles west of I-25 just south of the Colorado-Wyoming state line, in far northeastern Larimer County | Wellington | In the Soapstone Prairie Natural Area |
| Great Western Sugar Company Effluent Flume and Bridge | 19-Nov-2014 | (#14000927) | Cache la Poudre R., 1/2 mi. W. of Timberline Rd. | Fort Collins | |
| Greeley, Salt Lake and Pacific Railroad-Stout Branch | 16-Apr-2008 | (#08000291) | Approximately 0.5 miles (0.80 km) south of the junction of U.S. Highway 287 and County Road 28 | Laporte | |
| Harmony Mill | 22-Nov-1995 | (#95001327) | 131 Lincoln Ave. | Fort Collins | |
| Hewes-Kirkwood Inn | 28-Oct-1994 | (#94001254) | 465 Long Peak Rd. | Estes Park | Now part of an adult summer music camp. |
| Homestead Meadows Discontiguous District | 4-Oct-1990 | (#90001476) | At the end of Lion Gulch[9] | Estes Park | |
| Kaplan-Hoover Site | 18-Apr-2003 | (#03000229) | 800 metres (2,600 ft) south of the Cache La Poudre River, west of Windsor[10] | Windsor | A bone bed 15 metres (49 ft) long, dating from the Late Archaic period[10] |
| Kissock Block Building | 16-May-1985 | (#85001061) | 115-121 E. Mountain Ave. | Fort Collins | |
| Lake Haiyaha Trail | 5-Mar-2008 | (#08000125) | Roughly along Bear, Nymph, and Dream Lakes, then up Chaos Canyon[11] | Estes Park | |
| Laurel School Historic District | 3-Oct-1980 | (#80000909) | Off U.S. Highway 287 | Fort Collins | |
| Leiffer House | 2-Aug-1978 | (#78000278) | South of Estes Park off State Highway 7 | Estes Park | |
| Lindenmeier Site | 15-Oct-1966 | (#66000249) | Address Restricted | Fort Collins | |
| Livermore Hotel and General Store | 14-Sep-2001 | (#01000970) | 2140 Red Feather Lakes Road[12] | Livermore | |
| Lost Lake Trail | 5-Mar-2008 | (#08000126) | Roughly along the North Fork of the Big Thompson River[13] | Estes Park | |
| Loveland State Armory | 12-Apr-2001 | (#01000350) | 201 S. Lincoln Ave. | Loveland | |
| R.G. Maxwell House | 29-Sep-1980 | (#80000910) | 2340 W. Mulberry St. | Fort Collins | |
| MacGregor Ranch | 31-Jul-1989 | (#89001008) | 180 MacGregor Ave. | Estes Park | |
| William H. McCreery House | 2-May-2001 | (#01000445) | 746 N. Washington Ave. | Loveland | |
| McGraw Ranch | 17-Sep-1998 | (#98001163) | McGraw Ranch Rd. | Estes Park | |
| McHugh-Andrews House | 27-Dec-1978 | (#78000870) | 202 Remington St. | Fort Collins | |
| Enos Mills Homestead Cabin | 11-May-1973 | (#73000480) | South of Estes Park off State Highway 7 | Estes Park | |
| Milner-Schwarz House | 19-Mar-2014 | (#14000058) | 710 S. Railroad Ave. | Loveland | |
| Moraine Lodge | 8-Oct-1976 | (#76000206) | West of Estes Park off U.S. Highway 36 on Bear Lake Rd. | Estes Park | Boundaries increased on June 15, 2005under the name of “Moraine Park Museum and Amphitheater” |
| Mosman House | 15-Dec-1978 | (#78000865) | 324 E. Oak St. | Fort Collins | |
| Mountainside Lodge | 20-Jul-2000 | (#00000814) | 2515 Tunnel Rd. | Estes Park | On the grounds of the YMCA of the Rockies |
| North Inlet Trail | 5-Mar-2008 | (#08000127) | Roughly along North Inlet and Hallett Creek to Flattop Mountain[14] | Grand Lake | Extends into Grand County |
| Old Town Historic District | 2-Aug-1978 | (#78000871) | Roughly bounded by College Ave. and Mountain, Pine, Willow, and Walnut Sts. | Fort Collins | |
| Opera House Block/Central Block Building | 8-Feb-1985 | (#85000214) | 117-131 N. College Ave. | Fort Collins | |
| Park Theatre | 14-Jun-1984 | (#84000862) | 130 Moraine Ave. | Estes Park | |
| Patterson House | 22-Jan-2019 | (#100003319) | 121 N. Grant Ave. | Fort Collins | |
| Peep O Day Park | 10-Aug-2011 | (#11000520) | 5445 Wild Ln. | Loveland | |
| Pleasant Valley School | 11-Oct-2003 | (#03001008) | 4032 N. County Road 25E | Bellvue | |
| Plummer School | 29-Apr-1999 | (#99000485) | 2524 E. Vine Dr. | Fort Collins | |
| Preston Farm | 10-May-2001 | (#01000489) | 4605 S. Ziegler Rd. | Fort Collins | |
| Provost Homestead-Herring Farm Rural Historic Landscape | 27-Dec-2010 | (#10001053) | 2405 North Overland Trail | Laporte | |
| Rialto Theater | 17-Feb-1988 | (#87002213) | 228-230 E. 4th Ave. | Loveland | |
| T.H. Robertson House | 2-Jul-1992 | (#92000811) | 420 W. Mountain Ave. | Fort Collins | |
| Rocky Mountain National Park Administration Building | 3-Jan-2001 | (#01000069) | U.S. Highway 36 | Estes Park | |
| Rocky Mountain National Park Utility Area Historic District | 18-Mar-1982 | (#82001717) | Beaver Meadows Entrance Rd. | Estes Park | |
| E.A. Schlichter House | 22-Nov-2016 | (#16000784) | 1312 S. College Ave. | Fort Collins | |
| Henry K. and Mary E. Shaffer House | 9-Jan-2007 | (#06001219) | 1302 N. Grant Ave. | Loveland | |
| Snogo Snow Plow | 4-Oct-2006 | (#06000934) | Rocky Mountain National Park | Estes Park | |
| Soloman Batterson Ranch | 15-Oct-2010 | (#10000860) | 603 Mount Moriah Rd. | Livermore | |
| Spruce Hall | 9-Jan-1977 | (#77000381) | Colorado State University campus | Fort Collins | |
| Stanley Hotel | 26-May-1977 | (#77000380) | 333 Wonder View Ave. | Estes Park | |
| Stanley Hotel District | 20-Jun-1985 | (#85001256) | 333 Wonder View Ave.; also Fish Hatchery Rd. at the Fall River | Estes Park | Fish Hatchery is the Stanley Power Plant, a boundary increase of April 14, 1998 |
| Gustav and Annie Swanson Farm | 5-Oct-2005 | (#05001116) | 1932 N. U.S. Highway 287 | Berthoud | |
| Tonahutu Creek Trail | 5-Mar-2008 | (#08000130) | Roughly along Tonahutu Creek to Flattop Mountain[15] | Grand Lake | Extends into Grand County |
| Trail Ridge Road | 14-Nov-1984 | (#84000242) | Rocky Mountain National Park | Estes Park | Extends into Grand County |
| Truscott Junior High School | 16-Jul-2017 | (#100001339) | 211 W. 6th St. | Loveland | |
| Twin Sisters Lookout | 24-Dec-1992 | (#92001670) | On the Twin Sisters Peaks in Rocky Mountain National Park | Estes Park | |
| Agnes Vaille Shelter | 24-Dec-1992 | (#92001669) | Northwest of Longs Peak along the East Longs Peak Trail in Rocky Mountain National Park | Estes Park | |
| Virginia Dale Stage Station | 26-Sep-1985 | (#85002562) | Off U.S. Highway 287 | Virginia Dale | |
| Ernest Waycott House | 2-Dec-1993 | (#93001363) | 1501 W. Mountain Ave. | Fort Collins | |
| William Allen White Cabins | 25-Oct-1973 | (#73001944) | West of Estes Park of Moraine Park Visitor Center in Rocky Mountain National Park | Estes Park | |
| Beatrice Willard Alpine Tundra Research Plots | 25-Oct-2007 | (#07001101) | U.S. Highway 34 at Rock Cut and Forest Canyon | Estes Park | |
| Willow Park Patrol Cabin | 20-Jul-1987 | (#87001144) | Fall River Rd. | Estes Park | |
| Willow Park Stable | 20-Jul-1987 | (#87001145) | Fall River Pass | Estes Park | |
| Wind Ridge | 15-Oct-2002 | (#02001130) | 1397 Clara Dr. | Estes Park | |
| Ypsilon Lake Trail | 5-Mar-2008 | (#08000131) | Along a ridge between Chiquita Creek and the Roaring River | Estes Park | |
| Properties removed from the Register | Removal date | ||||
| Bear Lake Ranger Station | 29-Jan-1988 | (#87001138) | Bear Lake | Estes Park | 9-Apr-09 |
| Big Thompson River Bridge I | 15-Oct-2002 | (#02001144) | U.S. Highway 34 at milepost 65.53 | Estes Park | 29-Nov-10 |
| Big Thompson River Bridge II | 15-Nov-2002 | (#02001141) | U.S. Highway 34 at milepost 66.22 | Estes Park | 29-Nov-10 |
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