A Culture of Stewardship

At Bar T Bar Ranch:

For us, this is defined as:
  • We honor and learn from the past, while looking to the future through a common window, with a clear vision of our goals.
  • We instill actions and behaviors that respect and reflect our shared beliefs.
  • Reward will be achieved through the ethical care, management, and utilization of “People, Land, Livestock, Health, Wealth, and Property”.
  • We Ride for the Brand, and are committed to take this working cattle ranch into the future.

Essential Objectives

At Bar T Bar Ranch:

  • To increase profitability by increasing income, reducing operating costs, and improving efficiencies.
  • To build trust with our co-workers and ownership through improved communication and shared information.
  • To continually improve the quality of our products: Feeder cattle, commercial bred replacement heifers, registered bulls, and females, and beef for consumers.
  • To improve our customer base and increase our percentage of repeat customers.
  • To improve our safety record.

Bar T Bar Facts

The Bar T Bar Ranch, Inc., is owned and operated by Bob and Judy Prosser and their sons Spencer and Warren Prosser. An Arizona agribusiness since 1924, Judy Prosser represents the third generation of the Chilson family. Spencer and Warren are the 4th generation of cattlemen. 

Cattle Operation

1,000 - 1,200 commercial cows, 800 replacement heifers
300 registered Balancer, Angus, Gelbvieh, and Southern Balancer cows


Bar T Bar owns 3V’s, 41, Cross, –T–.  We use the Cross on the right hip of the registered cattle and bulls, and the –T– on the right side of our commercial cattle.


587 miles of fence
41 miles of buried pipeline
73 steel and concrete drinking tubs
47 miles of canals and ditches
286 earthen reservoirs and stock ponds
19 working corrals and shipping facilities
5 line camps
68 pastures, 3 cell-grazing systems with 34 paddocks
15 holding traps

Water Resources

The Bar T Bar owns rights to 1,000 acre-feet of surface water for irrigation, stock ponds, and flood control. This water is stored in Tremaine and Soldier Annex Lakes. We also have 22 deep wells (450–1,000 feet) and 3 shallow wells.

Winter Range

: Primary grasses include blue grama, black grama, galleta, alkalai sacaton, needle and thread, Indian ricegrass, and vine mesquite; primary browse includes four-wing saltbush, shadscale, Bigelow sage, and Mormon tea.

: Primary grasses include blue grama, black grama, squirreltail, sand dropseed, Indian ricegrass, and needle and thread; primary browse includes winterfat, Bigelow sage, four-wing saltbush, and Mormon tea.

Summer Range

Low elevation
: Grasses include blue grama, western wheatgrass, crested wheatgrass, squirreltail, Junegrass, Indian ricegrass, and mutton grass; browses include cliff rose, winterfat, four-wing saltbush, mountain mahogany, and four o’clock.

High elevation
: Grasses include Arizona fescue, western wheatgrass, mountain muhley, fringed brome grass, mutton grass, Kentucky bluegrass, intermediate wheatgrass, crested wheatgrass, orchard grass, Blue grama, Spike and Bull Muhly, Squirreltail, and black and pine dropseed; other forages include Gambel’s oak, yellow sweetclover, pea vine, cliffrose, sages, bur clover, and annual forbs.

Our Location

Winter headquarters and range

The Bar T Bar covers about 300,000 acres of private, state, and Forest Service lands between Winslow and Happy Jack, Arizona. The northern portion of the ranch is bisected by Diablo Canyon, which forms the boundary with the Flying M Ranch, its partner in the Diablo Trust. The Bar T Bar’s primary headquarters is located in this northern, high-desert area, just 3 miles east of Meteor Crater (4½ miles south of I-40 off exit 233). The rest of the winter range is bounded by the Hopi Three Canyon Ranches and a buffalo ranch maintained by the Arizona Game and Fish Department. Average annual precipitation here ranges from 6–7 inches.

Bar T Bar also owns the Black Rock Ranch, located 6 miles north of Joseph City. This scenic ranch encompasses about 50,000 acres of mixed-land ownership and provides a home for 150-300 cows year around.

Summer headquarters and range
Our summer headquarters lies within the southern, higher-elevation portion of the Bar T Bar, near Hay Lake, north of Highway 87 and east of FH3, about 14 miles from Happy Jack. We hold a U.S. Forest Service grazing allotment in this area, as well as a private headquarters known as Hay Lake. Average annual precipitation in the region ranges from 12–18 inches.

High elevation: Grasses include Arizona fescue, Western Wheatgrass, Mountain muhley, fringed brome grass, mutton grass, Kentucky bluegrass, intermediate Wheatgrass, Crested wheatgrass, Orchard grass, Blue grama, Spike and Bull Muhly, Squirreltail, and black and pine dropseed; Other forages include Gambel’s Oak, yellow sweetclover, Pea Vine, Cliffrose, Sages, bur clover, and annual forbs.

Land Stewardship

Bob and Judy Prosser were awarded the 2016 Range Managers of the Year by the Arizona Section Society of Range Management. Judy’s father, Ernest Chilson, received this award in the late 1960s.

The Diablo Trust: A collaborative, grass roots, land-management team
The Diablo Trust was formed in 1993 by the Metzger family, owners of the Flying M Ranch, and the Prosser family, owners of the Bar T Bar Ranch, to create a collaborative process for developing ideas to help protect open spaces and healthy habitats. The Trust is a 501(c)(3) nonprofit organization. Its mission is to sustain healthy land resources and open space through education and active involvement of the broader community in maintaining ranches as long-term, economically viable land stewardship enterprises.

The Trust currently relies on a core group of individuals for operation and research, and without membership fees or dues it relies on contributions to fund their programs.


Our Partners

Diablo Burger: It’s all about local

Bar T Bar supplies beef to Diablo Burger, Arizona’s favorite gourmet burger joints located in the heart of both downtown Flagstaff and Tucson.

Diablo Beef: The Reason God Made Fire

Our local ground beef program derived from ranch raised cows and bulls. Flavor is rich and so is the history. Learn more about Diablo Beef at diablobeefaz.com.

Leachman Cattle Co.

Continuing the Pursuit of Excellence in the Beef Industry. Learn more about Leachman Cattle of Colorado at leachman.com.

Country Natural Beef

Country Natural Beef was established in Oregon in 1976, is 40 years old, and therefore, is by far the oldest living beef cooperative in the U.S. Its' purpose is to provide natural, quality, beef to consumers while being good stewards of the environment, their animals, and their families. 100,000 mother cows managed on millions of acres of private and public lands in the west provide the source. What sets us apart: We hold ourselves to high product quality, animal welfare, and environmental standards. We don't do it because we have to — we do it because we care.


Contact Us

The Prosser Family
P.O. Box 190
Winslow, AZ 86047

Bob Prosser: 928-380-5149 

Seedstock Herd Manager, Kristin Hovey

Bob was awarded the
"2017 Breeder of the Year"
by the American Gelbvieh

Our Promise

  • $ RANCH for Leachman Cattle Company
    • All our sale bulls’ averages rank in top 13%
    • Their mothers calve every year in 45 days or they are gone
    • All our sale bulls’ averages rank in the top 13% for Fertility & top 10% for Teat & Udder scores
    • $ PROFIT
      • All our sale bulls’ averages rank in top 7%
      • Balanced trait selection for Life Cycle Efficiency, moderate size, post weaning growth, carcass merit & low PAP.
    • $ FEEDER
      • All our sale bulls averages rank in top 13%
      • Feed efficiency tested since 2010.
      • Every bulls in the sale is feed efficiency tested.

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