The Biggest Ranches in Colorado

Colorado's ranches stretch across some of the most varied terrain in the American West, from the sagebrush basins of the Western Slope to the 14,000-foot peaks of the Sangre de Cristo range. The Centennial State is home to several of the largest privately held landholdings in the country, many of them built on historic Spanish and Mexican land grants, homestead-era cattle operations, or state trust land that predates statehood.

Acreage figures for mega-ranches often fluctuate as land is bought, sold, leased, or reconfigured. The totals below reflect a combination of deeded (privately owned) land and active state or federal grazing leases, representing the most commonly reported figures across ranching, real estate, and conservation sources. Because several of these ranches have changed hands, added leased acreage, or shifted ownership structures in recent years, readers should treat the totals as directional estimates and confirm current figures before citing them in any transaction or investment decision.

The Biggest Ranches in Colorado

The biggest ranches in Colorado are High Lonesome Ranch, Trinchera Ranch, Silver Spur Ranches, Elk Mountain Cattle Company, Chico Basin Ranch, Cielo Vista Ranch, Cross Mountain Ranch, Diamond Peak Cattle Company, Vermejo Park Ranch, and Nottingham Land & Livestock.

Rank	Ranch Name	Estimated Acreage	Key Location/Focus
1	High Lonesome Ranch	256,000+ acres	Garfield & Mesa Counties - Western Slope - Conservation & Cattle
2	Trinchera Ranch (Trinchera Blanca)	172,000+ acres	Costilla County - San Luis Valley - Conservation & Timber
3	Silver Spur Ranches	150,000+ acres	Jackson & Elbert Counties - Cattle & Quarter Horses
4	Elk Mountain Cattle Company	120,000+ acres	Park County (Hartsel) - South Park - Cattle Grazing
5	Chico Basin Ranch	86,000+ acres	El Paso & Pueblo Counties - State Trust Land - Cattle & Birding
6	Cielo Vista Ranch	83,000+ acres	Costilla County - San Luis Valley - Conservation & Recreation
7	Cross Mountain Ranch	56,000+ acres	Moffat & Routt Counties - NW Colorado - Wildlife & Cattle
8	Diamond Peak Cattle Company	55,000+ acres	Moffat County (Craig) - High-Altitude Cattle
9	Vermejo Park Ranch	35,000+ acres (CO portion)	Costilla & Las Animas Counties - Conservation & Guest Ranch
10	Nottingham Land & Livestock	22,000+ acres	Moffat County (Craig) - Cattle & Wildlife Habitat

1) High Lonesome Ranch: 256,000+ Acres

Location: De Beque, Garfield and Mesa Counties, western Colorado

Owner: Paul Vahldiek Jr. and family

High Lonesome Ranch spans more than 370 square miles on Colorado's Western Slope, about 35 miles northeast of Grand Junction. The property is built from roughly 35,000 acres of deeded land layered with about 225,000 acres of permitted grazing land across two valleys that each stretch more than 20 miles. Owner Paul Vahldiek Jr. has run the ranch as a working cattle operation and conservation research site since acquiring it, raising grass-finished, regeneratively grazed beef on Audubon-certified grazelands.

Beyond cattle, the ranch is known for its role in large-landscape conservation. Vahldiek founded the Western Landowners Alliance in 2011 to connect ranchers, wildlife managers, and policymakers, and established the High Lonesome Institute, a research campus focused on habitat restoration and wildlife connectivity across the Western Slope. The ranch also operates guided elk and mule deer hunts and hosts weddings and corporate retreats across its terrain, which ranges from 4,000 to 9,000 feet in elevation.

2) Trinchera Ranch (Trinchera Blanca): 172,000+ Acres

Location: Costilla County, San Luis Valley, southern Colorado

Owner: Louis Bacon

Trinchera Ranch sits on the east side of the San Luis Valley near La Veta Pass and is widely considered the largest single ranch in Colorado. The property traces back to the 1843 Sangre de Cristo land grant, which originally encompassed more than a million acres across southern Colorado and northern New Mexico. Malcolm Forbes purchased the ranch in 1969 for roughly $50 an acre and later added the adjoining Blanca Ranch, giving the combined property its "Trinchera Blanca" name.

Hedge fund manager and conservationist Louis Bacon bought the ranch from the Forbes family in 2007 for $175 million. In 2012, Bacon donated a conservation easement on roughly 90,000 acres to the U.S. Fish and Wildlife Service, the largest in the agency's history, permanently protecting the land from development. The ranch includes three peaks above 14,000 feet, has been designated an International Dark Sky Place, and operates a sawmill that processes beetle-kill timber to help manage forest health across the property. Bacon separately owns a roughly 21,000-acre ranch in neighboring Las Animas County.

3) Silver Spur Ranches: 150,000+ Acres

Location: Jackson County (Walden/North Park) and Elbert County (Kiowa Creek), Colorado

Owner: John Malone

Silver Spur Ranches is the Colorado portion of a cattle empire owned by media executive John Malone, one of the largest private landowners in the United States with an estimated 2.2 million acres nationwide. Colorado's Silver Spur holdings center on the Walden Division in North Park, a collection of contiguous properties spanning roughly 60,000 acres of high-altitude terrain between 8,000 and 9,500 feet, including river-bottom willow complexes, hay meadows, and aspen stands that support elk and mule deer.

The ranch's second major Colorado division sits at Kiowa Creek in Elbert County, east of Denver, where Silver Spur raises show cattle across roughly 80,000 acres. Silver Spur also holds guided big-game hunting operations on more than 24,000 acres in Garfield County. The Colorado operations tie into Malone's broader portfolio, which includes the historic Bell Ranch in New Mexico and cattle operations in Wyoming and Nebraska, and blend Red Angus, Black Angus, and Charolais genetics into the ranch's proprietary Range Fire cattle.

4) Elk Mountain Cattle Company: 120,000+ Acres

Location: Park County (Hartsel), central Colorado

Owner: Monte Vaughn Downare

Elk Mountain Cattle Company runs roughly 30,000 deeded acres alongside about 90,000 acres of leased land, all within South Park, one of Colorado's three largest intermontane grassland basins and a designated National Heritage Area since 2009. The ranch headquarters sits at 8,800 feet in the town of Hartsel, within two hours of both Denver and Colorado Springs. The operation is bordered by 14,000-foot peaks and sits at the headwaters of the South Platte River, with more than 30 miles of named rivers and creeks and roughly 6,000 surface acres of stored water that supplies Front Range communities.

The ranch expanded significantly through a series of land acquisitions during the 2011-2013 bankruptcy proceedings of the neighboring Hartsel Springs Ranch development, picking up thousands of additional acres as that development wound down. Elk Mountain Cattle Company remains a working cattle operation today, and its scale and water infrastructure make it one of the more closely watched large landholdings in the South Park basin.

5) Chico Basin Ranch: 86,000+ Acres

Location: El Paso and Pueblo Counties, eastern Colorado

Owner: Colorado State Land Board (leased to a private operator)

Chico Basin Ranch is unusual among Colorado's largest ranches in that it isn't privately owned at all. The roughly 86,000-acre property, located about 35 minutes southeast of Colorado Springs straddling the El Paso-Pueblo county line, belongs to the Colorado State Land Board, which has managed trust land on behalf of the state's public schools since 1876. Cattle have grazed the basin since the mid-1800s, when cattleman Charles Goodnight ran herds on what later became the HOP Ranch, one of Colorado Territory's first cattle operations.

For 24 years, the Phillips family's Ranchlands managed Chico Basin under a State Land Board lease, building a national reputation for the ranch's conservation-oriented grazing, horsemanship, and bird-banding programs with the Bird Conservancy of the Rockies. In late 2024, the State Land Board selected the Johnson family's Flying Diamond Ranch as the new ag lessee beginning in 2025, ending Ranchlands' long tenure. Because the lease has recently changed hands, prospective buyers, investors, or partners interested in Chico Basin should verify current lease terms and operator details directly with the Colorado State Land Board rather than relying on older reporting.

6) Cielo Vista Ranch: 83,000+ Acres

Location: Costilla County, San Luis Valley, southern Colorado

Owner: William Bruce Harrison, through Cielo Vista Ranch II LLC

Cielo Vista Ranch stretches across more than 20 miles of Sangre de Cristo ridgeline and includes 14,047-foot Culebra Peak along with 18 additional peaks above 13,000 feet. Texas oil heir William Bruce Harrison purchased the roughly 83,000-acre property in 2017 for $105 million through his Cathexis Oil & Gas investment firm, making it the largest U.S. ranch sale that year. The ranch, also known locally as La Sierra, sits on land tied to an 1863 document that granted regional settlers access rights for grazing and gathering timber.

Cielo Vista is central to one of Colorado's longest-running land disputes: heirs of the original Sangre de Cristo land grant settlers have held court-recognized access rights to the property since a landmark 2002 Colorado Supreme Court ruling, and litigation over the scope of that access, including a contested boundary fence, has continued for years under multiple owners. Buyers or investors evaluating similarly encumbered Colorado properties should factor in that historic access rights and land grant obligations can attach to a parcel regardless of who holds title.

7) Cross Mountain Ranch: 56,000+ Acres

Location: Moffat and Routt Counties, northwest Colorado

Owner: The Boeddeker family

Cross Mountain Ranch was assembled over roughly 25 years by the late Ronald Boeddeker into two connected properties: the Upper Ranch in Routt and Garfield Counties, bordering Routt National Forest with 2.5 miles of frontage on the Williams Fork River, and the Lower Ranch in Moffat County, home to the ranch's namesake nine-mile-long, 8,000-foot ridge near the entrance to Dinosaur National Monument. Combined, the ranch's roughly 56,000 deeded acres are intermixed with more than 168,000 acres of leased Bureau of Land Management, U.S. Forest Service, state, and National Park Service land, supporting what is regarded as North America's largest migratory elk herd.

In 2014, the Boeddeker family placed 16,000 acres of the ranch's most critical sage grouse habitat under a conservation easement with the Colorado Cattlemen's Agricultural Land Trust, the single largest easement purchased under the federal Sage Grouse Initiative at the time. The ranch has been marketed for sale in recent years at a reported $100 million asking price, reflecting both its scale and its water rights along the Yampa, Little Snake, and Williams Fork Rivers.

8) Diamond Peak Cattle Company: 55,000+ Acres

Location: Moffat County (Craig), with operations extending into Wyoming and Utah

Owner: The Raftopoulos family

Diamond Peak Cattle Company began as a sheep operation started by Greek immigrants George and Georgia Raftopoulos in the early 1950s. What started with a single leftover milk cow grew, generation by generation, into one of Colorado's largest cattle grazing operations: roughly 55,000 acres of deeded land supplemented by another 250,000 to 300,000 acres of Bureau of Land Management, state, and private leases, largely west of Craig in Moffat County, with the ranch's northwestern reach extending into Wyoming and Utah.

Today the operation is run by John Raftopoulos and his sons George and Angelo, and it has become known nationally for its high-altitude Angus genetics program. After John earned a veterinary medicine degree from Colorado State University in 1978, the family built an artificial insemination program using stock from Montana's N Bar Ranch, and established the Diamond Peak Cattle Company's annual bull sale in 2008. The operation now synchronizes and breeds roughly 2,600 cows and heifers each year, selecting for the moderate frame and adaptability that high-altitude Western ranching demands.

9) Vermejo Park Ranch: 35,000+ Acres (Colorado Portion)

Location: Southeastern Costilla County and southwestern Las Animas County, Colorado (ranch headquarters in Colfax County, New Mexico)

Owner: Ted Turner, through Turner Enterprises

Vermejo Park Ranch is one of the largest privately held properties in North America, spanning more than 558,000 acres total, but the great majority of that acreage sits across the state line in Colfax and Taos Counties, New Mexico. Only a comparatively small slice of the ranch, roughly 35,000+ acres, extends north into Colorado's southeastern Costilla County and southwestern Las Animas County, reaching into the Sangre de Cristo Mountains and up to 12,931-foot Big Costilla Peak. Because the bulk of the operation and its main lodge sit in New Mexico, Vermejo is more often cited as one of that state's largest ranches, but its Colorado footprint alone would still rank among the state's biggest landholdings.

The ranch's Colorado acreage includes the Costilla Fishing Lodge and Costilla Reservoir, part of a 15-year, multi-partner restoration project that removed non-native fish from the Costilla watershed to restore native Rio Grande cutthroat trout habitat across roughly 120 miles of streams and 18 lakes spanning both states. Ted Turner purchased Vermejo Park Ranch from Pennzoil in 1996, sold off its cattle herds, and shifted the operation toward bison restoration, wildlife conservation, and eco-tourism; it remains the flagship property in Turner's roughly 2-million-acre ranch portfolio, which consistently ranks him among the largest private landowners in the country.

10) Nottingham Land & Livestock: 22,000+ Acres

Location: Moffat County (Craig), northwest Colorado

Owner: Michael "Mike" Nottingham

Nottingham Land & Livestock is a working cattle operation based near Craig in Moffat County, owned and operated by Mike Nottingham, who also serves as primary owner of the neighboring Blue Sage Ranch. Nottingham has been an active participant in Colorado Parks and Wildlife's Ranching for Wildlife Program, which grants CPW biologists access to private land for habitat and herd research in exchange for coordinated public hunting access. In 2023, Colorado Parks and Wildlife recognized Nottingham with its Landowner of the Year award for his contributions to habitat management and public hunting access on the ranch.

It's worth noting that Nottingham Land & Livestock in Moffat County is a separate operation from the similarly named Nottingham Ranch near Bond in Eagle County, a roughly 19,500-acre legacy cattle operation historically run by the Nottingham family of Avon and placed under a major conservation easement in early 2026. The two ranches share a surname and Western Slope ranching heritage but are independently owned and operated, which is a useful reminder for buyers and researchers to confirm ownership entities carefully when multiple ranches share a family name.

Why Are Colorado's Ranches So Big?

Colorado's largest ranches are big for a mix of reasons that vary by region, but two forces show up again and again: aridity and land grant history. Much of eastern and southern Colorado receives well under 20 inches of rain a year, and native shortgrass and high-desert range can require anywhere from 20 to more than 100 acres to support a single cow-calf pair, depending on elevation, precipitation, and terrain. A cattle operation that would be modest in size in a wetter state has to control far more acreage in Colorado just to run a comparable herd, which is why deeded acreage alone rarely tells the whole story - most of the ranches on this list supplement a private land base with state or federal grazing leases that can run several times larger than what the ranch owns outright.

Southern Colorado's largest ranches also carry a distinct history tied to 19th-century Spanish and Mexican land grants, particularly the 1843 Sangre de Cristo Land Grant that once covered more than a million acres of the San Luis Valley. That legacy still shapes ownership and access today: several of the region's largest ranches, including Trinchera and Cielo Vista, remain subject to historic access rights held by descendants of the original grant settlers, and any buyer or investor evaluating land in this part of the state should factor those obligations into their due diligence.

Water is the third major driver of scale. Ranches with senior water rights along rivers like the Colorado, Yampa, or Rio Grande can irrigate hay meadows that support far larger cattle herds than dryland grazing alone, which is one reason ranch owners increasingly place their water-rich acreage under conservation easements rather than risk losing water rights to municipal or agricultural buyers elsewhere in the state.

How to Map Colorado Ranch Ownership With LandApp

If you want to see exactly where a ranch's boundaries fall, who owns adjoining parcels, or track down contact information for a landowner, LandApp makes it possible to build your own ownership map for free with LandApp Pro. Here's the workflow:

1. Open the Parcel Search tool and set your filters: Open the Parcel Search tool, then select a state and add an owner name, or search by acreage, zoning, or location to find large landholdings in a specific area.

2. Save your results to a Portfolio: Once you've found the parcels that make up a ranch, save them to a Portfolio. Portfolios keep a running list of parcels along with owner names and mailing addresses, which is useful whether you're tracking a ranch's full footprint or reaching out to a landowner directly.

3. View the Portfolio in the Parcel Data tool: From there, open your Portfolio in LandApp's Parcel Data tool to view full parcel details, generate Property Reports, and build a map of the ranch's boundaries layered against ownership, soil, flood zone, and other data.

Parcel Search User Manual

Get Nationwide Ownership Data With LandApp Pro

LandApp's free tools already let you view parcel boundaries, acreage, and APNs on a nationwide map, browse and post unlimited real estate listings at no cost, and generate one free Property Report. But if you want to go deeper, like pulling ownership and assessor data for any parcel in the country, running the Parcel Search workflow above, or saving landowner contact information to a Portfolio, that's where LandApp Pro comes in.

With LandApp Pro, you get unlimited Property Reports, nationwide ownership and assessor data, the full Parcel Search tool, and unlimited Portfolios - everything you need to research a Colorado mega-ranch, track down a landowner, or evaluate a potential acquisition without leaving the map.

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Frequently Asked Questions

What is the largest ranch in Colorado?

The largest ranch in Colorado is generally cited as Trinchera Ranch, a roughly 172,000-acre property in the San Luis Valley owned by hedge fund manager and conservationist Louis Bacon. Some sources cite the High Lonesome Ranch, at roughly 256,000 total acres, as larger; the difference typically comes down to whether deeded land alone or deeded-plus-leased acreage is being counted.

How many acres does it take to run a cattle ranch in Colorado?

It depends heavily on location and rainfall. In wetter mountain valleys with irrigated hay meadows, a single cow-calf pair may need only a few acres. In Colorado's arid high plains and desert basins, that same pair can require 20 to more than 100 acres of native range, which is why the state's largest cattle operations often span tens or hundreds of thousands of acres.

Why are so many of Colorado's largest ranches under conservation easements?

Large Western ranches are expensive to maintain and often sit on ecologically significant land, water rights, or wildlife habitat. A conservation easement permanently restricts development in exchange for tax benefits or direct payment, which lets owners protect the ranch's open space and water rights for future generations while keeping the land in agricultural production.

Who owns the most ranch land in Colorado?

Ownership changes over time, but some of the largest private landholders with Colorado ranch acreage include Louis Bacon (Trinchera Ranch), John Malone (Silver Spur Ranches), William Bruce Harrison (Cielo Vista Ranch), and Ted Turner, whose 558,000-acre Vermejo Park Ranch straddles the Colorado-New Mexico border. The Colorado State Land Board also manages significant acreage, including Chico Basin Ranch, on behalf of the state's public schools.