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Unit focus: What makes the Henry Mountain mule deer so famous?

Henry Mountains in Utah

The Henry Mountains in south central Utah are synonymous with giant mule deer. Located just north of Lake Powell, the Henry Mountains consist of 2 million acres of public lands with elevations from 5,000’ to 11,522’, offering a variety of habitat types and a broad ecological community. Why are the Henry’s so good? What makes the deer hunting there special? Below we will examine these amazing mountains and the management plan that makes this area iconic for deer hunters. 

The Henry’s hold unique allure in comparison with many of the other mountain ranges in the west. Hidden in the vast deserts of southern Utah, the Henry’s were not named until 1871 and many believe that the Henry’s were the last named mountain range in the Lower 48. John Wesley Powell penned the name “the Henry’s” after Secretary of the Smithsonian Institute Joseph Henry. The Henry’s first gained notoriety after reports on its geology were completed in the 1870s. Due to the remoteness of the area, colonization came slow to the Henry’s and, even in present day, the Henry’s remain a relative wilderness isolated from human activity.

The modern history of deer hunting in the Henry’s begins with a closure of deer hunting in the unit in the late 1990s. The closure was a result of dwindling deer numbers. In 2003, major fires swept across the landscape, limiting juniper encroachment and, ultimately, leading to an explosion of lush forage. The deer hunting season was reopened after careful herd monitoring and, ever since, the Henry’s have become one of the premiere mule deer destinations in the world.

By the numbers in Utah

Boone and Crockett (B&C) production: typicals

County Typical entries
Kane* 31
Garfield* 17
Summit 14
San Juan 11

*Henry Mountains
 

Boone and Crockett (B&C) production: nontypicals

County Nontypical entries
Utah 10
Iron 9
Cache 8
Morgan 7
Kane* 6

*Henry Mountains

Management
 

Giant 232 inch Henry Mountain mule deer guided by Wade Lemon Hunting
This is what lucky tag holders have an opportunity at. This giant 232 4/8" inch buck was taken by "Woody" and guided by Wade Lemon Hunting - a goHUNT Business Member

The Henry’s are managed as one of Utah’s two premium entry deer units. The Paunsaugunt is the other premium unit in the state. As part of the premium unit management, the Henry’s are managed for 40 to 50 bucks per 100 does and an annual buck harvest of 40% to 55% bucks five and a half years of age or older. By comparison, the seven limited entry units in Utah are managed for 25 to 35 bucks per 100 does.

Bucks on the Henry's are exceptional! Check out this 35 to 40 inch wide buck at the 39 second mark!

The state management plan for the Henry’s dictates that the unit’s deer herd is to be managed for a “healthy population” to provide “a broad range of recreational opportunities, including hunting and viewing.” Here, we will examine the state management plan regarding the following categories: age structure and herd composition, nutrition and habitat, and genetic variables.

Age and herd composition

Glassing old burns for Henry Mountain mule deer

Age is the most significant factor contributing to great deer hunting in the Henry’s. Bucks typically do not reach their maximum antler potential until 5.5 or 6.5 years of age or older. A whopping 72% of the bucks harvested in the Henry’s in the past three years have been five years of age or older.

Adult sex ratios are another statistic the state management plan take note of each year. The state's premium unit management plan dictates the Henry’s be managed for 40 to 50 bucks per 100 does. The three-year average is 52 bucks per 100 does in the Henry’s. 

Fawn recruitment is also critical when considering management practices. Recruitment indicates the number of fawns per 100 does that will make it reproductive maturity. This dictates the number of new individuals entering a population and at what rate the population will grow. Recruitment rates are also a great indicator of fawning habitat quality and predation. The average recruitment over the same period is 72 fawns per 100 does. 

Harvest and population trends for the Henry Mountains

Year Buck
harvest
Avg.
age
% of bucks
>5 years of age
Fawn:doe
ratio
Buck:doe
ratio
2012 45 4.9 64% 74 52
2013 46 6.2 89% 60 55
2014 47 6.6 63% 81 48
3 year avg.
(2012-2014)
46 5.9 72% 72 52
 
Source: State Deer Herd Management Plan for the Henry Mountains.
 

Population trends for the Henry Mountains

Year Pop.
Est.
Pop.
Obj.
% of
Pop. Obj.
2012 1,900 2,000 95%
2013 1,800 2,000 90%
2014 2,200 2,000 110%

Source: State Deer Herd Management Plan for the Henry Mountains.

The target size for the winter herd in the Henry’s is 2,700 animals. The latest wintering herd estimate on the Henry’s found 2,200.

Nutrition and habitat

Foggy morning in the Henry Mountains

Nutrition is, of course, all about habitat. In arid regions such as the Henry’s, moisture plays a major role in habitat conditions as well as nutritional availability each year. The fires of 2003 drastically changed the landscape on the Henry’s, ultimately leading us to the current deer hunting heyday climate we are in now.

To date, the state has taken on the habitat projects listed below in an effort to improve mule deer habitat across the unit. In general, these practices attempt to move plant communities back to early successional stages in which grasses, forbs, and shrubs thrive.

Treatments and restoration work
in the Henry Mountains

Treatment Description Acres
Aerator Diversify sagebrush
habitat
3,180
Anchor Chain Reduce pinyon-juniper
encroachment
919
Bullhog Reduce pinyon-juniper
encroachment
132
Harrow Reduce ground cover and
open areas for grasses and forbs
1,296
Seeding
(primary)
Reintroduction of native
species to understory
1,926
Vegetation
removal
Reduce pinyon-juniper or other
non-desirable species encroachment
1,729


The state management plan for the Henry’s divides the habitat types in the unit into three categories: summer range, winter range, and yearlong habitat types. Summer range is largely dictated by elevation while the other two categories are qualified by plant communities.

The famous Henry Mountain in Utah for mule deer

The state management plan dictates these habitat types as follows:

Summer Range: high elevation habitat characterized by mixed conifer forest, aspen, and mountain shrub. 

Winter Range: mid to low elevation habitat characterized by mixed sagebrush and shadscale communities.

Yearlong: mid to low elevation habitat consisting of sagebrush flats, shadscale communities, etc.

Habitat types and acreage

Range Type Yearlong Summer Winter
Acreage 33,591 38,265 100,785

Source: State Deer Herd Management Plan for the Henry Mountains.

Quality genetics
 

Todd Peterson with a Henry Mountain buck guided by Wade Lemon Hunting
Todd Peterson with a Henry Mountain buck guided by Wade Lemon Hunting — A goHUNT Business Member

While much emphasis is placed on genetics, little can be done to alter the genetics of a herd. The Henry’s deer herd is genetically similar to much of the herd across the state. This cannot be hashed out in hunter success or annual harvest due to the overwhelming effect of age on genetic expression.

Top Utah units for buck:doe ratios

Unit Buck:Doe
Ratio
Trophy
potential
Limited
Entry
General Both
Henry Mountains 55:100 180" + X    
Paunsaugunt 44:100 180" + X    
Southwest Desert 29:100 180" +   X  
Chalk Creek/East Canyon/
Morgan-South Rich
27:100 170" +   X  
West Desert, Tintic 26:100 150" +   X  
Plateau, Thousand Lakes 25:100 160" +   X  
San Juan, Elk Ridge 24:100 180" + X    
Zion* 24:100 180" +     X
Kamas 23:100 170" +   X  
Monroe 23:100 160" +   X  

* Zion Muzzleloader is a Limited Entry hunt

The state management plan for the Henry’s has implemented a management buck harvest program that seeks to reduce the buck to ratio below 55 bucks per 100 does. A management buck is defined as any buck with three points or fewer on one side (not including eyeguards). It is the hope of the Utah Division of Wildlife Resources (UDWR) that bucks harvested on this hunt are three and a half years of age or older.

There were 28 of these tags issues annually from 2012 to 2015. This program will continue as long as the buck to doe ratio in the unit exceeds 55 bucks per doe.

Hunting the Henry’s

Glassng for mule deer through the fog in the Henry Mountains

There is one word that best describes the odds of ever drawing a coveted Henry’s mountain deer tag: slim. Residents and nonresidents are limited to between 45 to 47 trophy bucks tags on the average year. These tags are divided amongst three seasons: the archery, muzzleloader, and the rifle. There is a late rifle hunt for management bucks only.

Utah issues these tags through both a preference point pass (some tags automatically go the highest point holder) and a random draw (tags are issued to individuals selected at random through a draw process. The maximum point pool for nonresidents in Utah for deer is 21 as of 2016.

Difficulty of getting a Henry Mountain's deer tag

Residency Total
applicants
Tags
available
Resident 6,561 41
Nonresident 5,615 5

Table based on 2015 data.

Whether you are a resident or a nonresident, the odds are tough! But the reality is someone has to draw them, so even if you aren’t in the running for the maximum point pool, applying annually is your only shot. 

Utah Henry Mountains deer random and bonus draw
Example of how tags were allocated in 2015 for the archery hunt.

Parting thoughts
 

Picking apart the terrain in the Henry Mountains
The trend here is big optics are needed when trying to find that buck of a lifetime.

Without a doubt, the Henry’s are a mule deer hunter’s dream. What exactly is the special sauce? What makes it so special? After carefully researching the unit and the management practices implemented, I think it is safe to conclude that two major factors have led to where the Henry’s deer hunting is now. 

The first is the major habitat changes caused by the fires of 2003. These fires opened up vast swaths of land placing habitats back to an early successional stage that deer thrive on. Pair this with the habitat improvement projects that state has taken on and the end result is the high quality habitat we see in the Henry’s today.

The second major factor that contributes to the amazing quality of the Henry’s mountain mule deer herd is age structure. Through careful conservation management, the state has ensured the average buck taken off the Henry’s is five and a half years of age or older. There are few other regions in the country that can claim this sort of harvest age class. Pair age with quality habitat and the results can be spectacular.

So when does the heyday end? What factors could result in a decline in the Henry’s herd?

There are a few variables that jump to the surface. The first is drought. Severe drought can affect fawn recruitment, winter and summer range quality, and antler growth. Long sustained drought could certainly impact quality.

Given the remoteness of the Henry’s, predation is another factor that could one day play into an overall decline of the unit. There simply aren’t as many lion or other predator hunters making it to the Henry’s as there are in other parts of the state. This is something the state monitors and has contingency plans in place should predation reach a non-sustainable rate.

With large amounts of winter range habitat, the impact of large snowfall and winter kill is not as likely as in other units. Summer range is much more a limiting factor in the Henry’s. Maintaining and carefully managing these summer range habitats will continue to be a priority.

The Henry’s certainly are the mule deer hunter’s dream. Well off the beaten path, the allure of the Henry’s lies not just in the deer hunting. The remoteness and vast beauty of the landscape makes this a must see location, regardless of whether or not you are lucky enough to draw a coveted tag.

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