Starting Jan. 1, the minimum wage in unincorporated Boulder County is $15.69/hour.

A partir del 1 de enero, el salario mínimo local en la zona no incorporada del condado de Boulder será de $15.69/hora.

Hall Ranch
Hall Ranch

Hall Ranch

Checking for closures…

A landscape of rolling grasslands and sandstone buttes at Hall Ranch provides excellent viewing opportunities for wildflowers, animals, and scenic vistas.


  • Bitterbrush Trail

    3.7 miles – Difficult
    Horses permitted but not recommended

    Hiking Allowed Dogs Prohibited Bikes Allowed E-bikes Prohibited Horses Allowed
  • Nighthawk Trail

    4.7 miles – Moderate/Difficult

    Hiking Allowed Dogs Prohibited Bikes Prohibited E-bikes Prohibited Horses Allowed
  • Nelson Loop

    2.2 miles – Moderate/Difficult

    Hiking Allowed Dogs Prohibited Bikes Allowed E-bikes Prohibited Horses Allowed
  • Antelope Trail

    1.0 miles – Moderate

    Hiking Allowed Dogs Prohibited Bikes Allowed E-bikes Prohibited Horses Allowed
  • Button Rock Trail

    2.0 miles – Moderate

    Hiking Allowed Dogs Prohibited Bikes Prohibited E-bikes Prohibited Horses Prohibited

Caribou Ranch Trail Profile

Rules & Regulations

Day Use Only
No Pets Allowed
Bikes On Designated Trails Only
No Open Fires
No Hunting/Firearms
No Camping

All Parks & Open Space Rules & Regulations

Hall Ranch Trailhead

64 car parking spots across 2 lots
2 ADA van accessible parking spots
Restroom near trailhead
Several picnic tables located near parking lots
50 person group shelter located near trailhead
3 horse trailer parking spots

Antelope Trailhead

8 car parking spots

See Photos

Keep in Mind

  • Dogs are not allowed due to wildlife concerns.
  • Some areas are closed to the public to protect critical wildlife habitat.
  • Some old dirt roads exist on the property – please stay on designated trails.
  • Equestrian use is not recommended on the Bitterbrush Trail due to inadequate footing on exposed rocks. Please use the Nighthawk Trail.

Prescribed Burn Closures

Prescribed burns will be conducted when conditions allow.

  • Burn window set for Jan. 15 – April 15. Burns can occur any time during the window.
  • Park will be closed during ignition days and will reopen when deemed safe.

Learn more about Prescribed Burns.

Trailhead Construction Project

A major construction project is scheduled for the Hall Ranch Trailhead. All trails will remain open unless otherwise closed due to muddy conditions or prescribed burns. Visitors can use the Antelope Trailhead or other legal parking areas.

March 11 – April 4: Full Trailhead Closure
The entire trailhead will be closed for construction.

April 4 – June 13: Upper Parking Area Closed
The lower parking area will be open but the upper parking area will remain closed.

March 11 – June 13: Equestrian Parking Closed
There will be no horse trailer parking.

March 11 – June 13: Shelter Closed
The shelter will be closed.

June 13 – July 18: Lower Parking Area Closed
The upper parking area will be reopen but the lower parking area will be closed.

Project Goals
The goal of this project is to improve the drainage, road surface, and overall efficiency of the trailhead. Many sections have faced erosion and need repairs to prevent additional damage to the road, make vehicle access easier, and reduce impacts on the surrounding area. Water pooling in parking spots has caused the deterioration of wood timbers over time. To fix this, the wood parking timbers will be replaced with new stone curbing, which is a more sustainable solution. The stone curbing will be installed with drainage gaps to avoid water pooling, making the trailhead more resilient

Along Colorado’s Front Range the sweeping grasslands of the Great Plains rise to meet the rugged peaks of the southern Rocky Mountains. Where they meet we find the Foothills—a zone of geological and biological transition. Foothills ecosystems, such as the one that makes up the 3,899 acres of Hall Ranch, are made up of varied landforms such as cliffs, canyons, hills, and meadows. Plant communities ranging from grasslands to shrublands to forests provide a variety of habitats for a diversity of animals.


  • Black bear
  • Black-tailed prairie dog
  • Chickaree
  • Coyote
  • Deer mouse
  • Little brown bat
  • Meadow vole
  • Mountain (Nuttall’s) cottontail
  • Mountain lion
  • Mule deer
  • Red fox
  • Rock squirrel


  • American crow
  • American kestrel
  • American robin
  • Black-billed magpie
  • Black-capped chickadee
  • Blue grosbeak
  • Broad-tailed hummingbird
  • Brown-headed cowbird
  • Canyon wren
  • Chickadee
  • Chipping sparrow
  • Common nighthawk
  • Common raven
  • Downy woodpecker
  • Golden eagle
  • Green-tailed towee
  • Hairy woodpecker
  • Mountain bluebird
  • Mountain chickadee
  • McGillivray’s warbler
  • Northern flicker
  • Prairie falcon
  • Pygmy nuthatch
  • Red-tailed hawk
  • Rufous-sided (spotted) towee
  • Solitary vireo
  • Steller’s jay
  • Turkey vulture
  • Townsend’s solitaire
  • Violet-green swallow
  • Virginia’s warbler
  • Western bluebird
  • Western meadowlark
  • Western wood-pewee
  • White-breasted nuthatch
  • Yellow warbler – nesting
  • Yellow-rumpled warbler
  • Yellow-breasted chat


  • Bullsnake
  • Prairie rattlesnake

White Wildflowers

  • Catchfly (silene noctiflora)
  • Daisy fleabane (Erigeron spp)
  • Marbleseed (Onosmodium molle)
  • Mouse ear chickweed Cerastium spp)
  • Prickly poppy (Argemone polyanthemos)
  • Rough white aster (Virgulus falcatus)
  • Wild licorice (Glycyrrhiza lepidota)

Yellow Wildflowers

  • Cinquefoil (Drymocallis spp, Potentilla spp)
  • Common sunflower (Helianthus annuus)
  • Evening primrose (Oenothera villosa)
  • Goldenrod (Solidago spp)
  • Golden banner (Thermopsis divaricarpa)
  • Gumweed (Grindelia squarrosa)
  • Hairy false golden aster (Heterotheca villosa)
  • Little sunflower (Helianthus pumilus)
  • Prairie coneflower (Ratibida columnifera)
  • Snakeweed (Gutierrezia sarothrae)
  • Sulphur flower (Eriogonum umbellatum)
  • Winged buckwheat (Pterogonum aliatum)

Green Wildflowers

  • Fringed silver sage (Artemisia frigida)
  • Prairie sage (Artemisia ludoviciana)

Orange & Red Wildflowers

  • Prickly pear (Opuntia polyacantha)

Purple & Blue Wildflowers

  • Beebalm or horsemint (Monarda fistulosa)
  • Blue flax (Adenolinum lewisii)
  • Common harebell (Campanula rotundifolia)
  • Fleabane (Erigeron sp)
  • Gayfeather (Liatris punctuta)
  • One-sided penstemon (Penstemon secundiflorus)


  • Arkansas rose
  • Common juniper
  • Mountain mahogany
  • Rabbitbrush
  • Wild rose
  • Wild tarragon
  • Yucca


  • Cottonwood
  • Douglas fir
  • Ponderosa pine
  • Rocky Mountain juniper

At Hall Ranch, dramatic tilted rock formations show where the Great Plains meet the Southern Rocky Mountains. Along the Bitterbrush Trail are spectacular views of Hat Rock and Indian Lookout Mountain. These massive ridges expose the Fountain, Lyons, and Ingleside Formations.

The Lyons Formation, a salmon-colored rock, can be seen in buildings on the University of Colorado’s Boulder campus. The western section of the property is dominated by formations created 1.3 to 1.7 billion years ago when magma far below the earth’s surface cooled and solidified before being subjected to the forces of pressure, uplift, erosion, and burial. The most recent period of mountain building began approximately nine million years ago. Since then, erosion has been the geologic force sculpting the landscape.

From Mountainside to University

A quarry can be seen along Hall Ranch’s eastern side. Stones from here were used in many of the University of Colorado Boulder’s buildings, giving it its signature flagstone look.

Hall Ranch as Home

Originally, the property that is now Hall Ranch was home to Arapaho and Cheyenne Indian tribes. In the 19th and 20th centuries, more than 20 different Anglo families homesteaded here. From the mid 1940s to 1993, Hallyn and June Hall owned and operated the ranch.

Historic Buildings

The Nelson House, located along the Nelson Loop Trail, is the remnants of an old homestead from the early 20th century.


In 1993 and 1994, Boulder County Parks and Open space acquired Hall Ranch.

Contact Us

Parks & Open Space

8 a.m. to 4:30 p.m.

Office Location

5201 St. Vrain Road
Longmont, CO 80503
Map and Directions
Office Hours: 8 a.m. to 4:30 p.m.
Friday by phone, email, or appointment only.

Parks are open sunrise to sunset