Unit 370

Bull Mountain/Whitetail

Rolling foothills and canyon drainages between Boulder and Interstate 90 with moderate forest cover.

Hunter's Brief

Unit 370 sits in the foothills south of Boulder, mixing open parks and rolling ridges with moderate timber. Elevation spans from low valleys to higher buttes, creating distinct seasonal movement patterns. Access comes via Route 69 and the Boulder-Whitetail Road, with fair connectivity to base areas. Water is limited—springs and creeks exist but aren't abundant, requiring route planning. The unit's moderate complexity and mix of open and forested terrain accommodates multiple hunting strategies, though water scarcity means identifying reliable sources before heading in.

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Terrain Complexity
6
6/10
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Unit Area
185 mi²
Compact
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Public Land
38%
Some
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Access
1.1 mi/mi²
Fair
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Topography
28% mountains
Rolling
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Forest
30% cover
Moderate
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Water
0% area
Limited

Terrain Deep Dive

Landmarks & Navigation

Black Butte and Red Hill serve as prominent visual references for navigation across the rolling terrain. Sheep Rock provides a distinctive pillar landmark in the foothills. The Boulder-Whitetail Divide forms a natural boundary and ridgeline for glassing and movement.

Named parks like Little Whitetail, Ridge, and Brady Park break up the country and mark specific flat terrain features. Major drainages including Dearborn Canyon, Potter Canyon, and Dunn Canyon cut through the unit and provide navigation corridors. These canyons funnel game movement and serve as logical travel routes for hunters working the terrain.

Elevation & Habitat

The unit spans from low valleys around 4,300 feet to ridgetops and buttes exceeding 8,500 feet, creating three distinct elevation zones. Lower elevations feature open parks and sagebrush flats interspersed with ponderosa stands—Swampy Park, Grouse Park, and the various other named parks dot this zone. Mid-elevation terrain supports mixed forest with ponderosa and Douglas-fir, broken by canyon drainages and ridgelines.

Higher elevations around Black Butte and Dunn Peak carry denser timber. This elevation spread concentrates game movement through specific corridors as seasons change.

Elevation Range (ft)?
4,2918,589
02,0004,0006,0008,00010,000
Median: 5,305 ft
Elevation Bands
8,000–9,500 ft
1%
6,500–8,000 ft
21%
5,000–6,500 ft
40%
Below 5,000 ft
38%

Access & Pressure

Route 69 provides the primary north-south corridor, with the Boulder-Whitetail Road offering secondary access into the southern portions. The road network totals roughly 200 miles within the unit, creating fair connectivity for vehicle-based access. However, the actual access density and terrain complexity suggest that mid-unit regions away from main roads see lighter pressure than roadside drainages.

The moderate size and foothill position mean this unit likely attracts local pressure from the Boulder area without drawing the extensive outside attention of larger wilderness units. Hunters willing to walk beyond immediate road corridors should find less-trafficked country.

Boundaries & Context

Unit 370 occupies the foothills of Jefferson County immediately south of Boulder, bounded by Route 69 to the north and Interstate 90 to the south. The Boulder River defines the eastern edge, while the Boulder-Whitetail Divide forms the southern boundary. This compact foothill unit sits in the transition zone between the broad valley floor near Boulder and the higher mountain terrain to the south.

The proximity to Interstate 90 and Route 69 provides reference points for orientation, though the unit itself remains relatively removed from the interstate corridor.

Land Cover Breakdown?
Mountains (forested)
18%
Mountains (open)
10%
Plains (forested)
12%
Plains (open)
60%

Water & Drainages

Water is the limiting factor in Unit 370. The Dearborn Creek drainage and its tributaries provide the most reliable perennial water, flowing north toward the Boulder River. Rocky Canyon Creek and South Fork Cottonwood Creek offer seasonal flows in the western portions. Springs are scattered throughout—Tebay Spring, Trail Spring, Lookout Spring, and Elk Run Spring exist, but require pre-hunt scouting to confirm reliable flow.

Potter Creek and Quinn Creek provide additional options in certain areas. The limited overall water abundance makes identifying and planning around reliable sources critical for extended hunting days.

Hunting Strategy

Unit 370 supports elk, mule deer, white-tailed deer, and mountain lion. The elevation span triggers seasonal migration—early season hunters should focus higher terrain around Black Butte and the ridgelines, while rut and late-season activity concentrates in lower parks and canyon bottoms as animals drop elevation. Dearborn Canyon and Potter Canyon funnels game movement and merit thorough glassing and stalking.

The open parks interspersed with timber create ideal mule deer habitat, while white-tails favor the denser drainage bottoms. Mountain lion sign typically follows deer concentrations. Water scarcity means planning routes that don't stray too far from identified springs or creeks, or being prepared for long carries.