Betasso Preserve 

Betasso Preserve

The diverse terrain, abundant scenic vistas, and relative peace and quiet have made Betasso Preserve a favorite destination for locals and tourists alike.

Resident Ranger Tweets



Betasso Link

1.3 miles
Hiking Allowed Leashed Dogs Allowed Bikes Allowed Horses Allowed

Bummers Rock Trail

0.4 miles
Hiking Allowed Leashed Dogs Allowed Bikes Prohibted Horses Allowed

Blanchard Trail

0.25 miles
Hiking Allowed Leashed Dogs Allowed Bikes Prohibted Horses Prohibted
This is a short trail made up of 177 steps that lead to the Blanchard Cabin

Canyon Loop

3.3 miles
Hiking Allowed Leashed Dogs Allowed Bikes Allowed Horses Allowed
Bike Direction: Clockwise Clockwise
Bikes prohibited Wednesdays & Saturdays

Loop Link

0.75 miles
Hiking Allowed Leashed Dogs Allowed Bikes Allowed Horses Allowed
Bikes prohibited Wednesdays & Saturdays

Benjamin Loop

2.4 miles
Hiking Allowed Leashed Dogs Allowed Bikes Allowed Horses Allowed
Bike Direction: Clockwise Clockwise
Bikes prohibited Wednesdays & Saturdays

Fourmile Link

0.8 miles
Hiking Allowed Leashed Dogs Allowed Bikes Allowed Horses Allowed
Horses can only access from the Benjamin Loop due to steep terrain and stairways
Bikes prohibited Wednesdays & Saturdays

Picnic Areas

  • Several picnic tables located near trailhead
  • Large 50-person group shelter located near trailhead. Reserve the shelter.


  • Located near the trailhead


  • 46-car spots in three parking lots
  • Horse trailer parking available at Bummer's Rock Trailhead
  • No parking along Fourmile Canyon Drive

Mountain Bikes

  • Not permitted Wednesdays and Saturdays on the Canyon Loop and Benjamin Loop trails
  • Not permitted on the Bummers Rock Trail or Blanchard Trail
  • Exhibit caution when passing other users on the narrow and steep Benjamin Loop
  • Required to travel the posted direction
    • A change is direction is made approximately every two weeks

Keep in Mind

  • Hikers & equestrians are encouraged to visit Betasso on Wednesdays and Saturdays when bikes are not on the trail
  • Hiking, horseback riding, and dog-walking (on leash) are allowed on all trails
  • Due to the popularity of Betasso Preserve, trail sharing and etiquette is particularly important
  • The Benjamin Loop trail is very steep and narrower than 3-feet wide and is particularly challenging for novice equestrians and mountain bikers
  • Equestrians and mountain bikers are strongly encouraged to walk the trail system before riding
  • Equestrians can access the Fourmile Link trail from the Benjamin Loop only. There is steep terrain and stairways between Fourmile Creek and Fourmile Canyon Drive.

Helicopter Logging Forestry Project Postponed

The project to thin 90 acres at Betasso Preserve has been postponed. The project was originally scheduled to start in early 2016 and would reduce the density of ponderosa pine by 50 to 70 percent on county land adjacent to the City of Boulder's Water Treatment Plant.

The project is currently being reevaluated and may be combined with another project that is scheduled to take place for the winter of 2015/2016. The combined projects will encompass approximately 200 acres in the immediate vicinity of the water treatment plant. More information will be posted once plans are finalized later this summer.

For more information contact Stefan Reinold, Senior Resource Specialist-Forestry.


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Management Plan

Maps & Graphs

Plants & Animals

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 are made up of myriad landforms such as cliffs, canyons, hills, and plateaus. Plant communities range from grasslands to shrublands to forests which provide a variety of habitats for a rich diversity of animals.


  • Abert's squirrel
  • Black bear
  • Bobcat
  • Coyote
  • Least chipmunk
  • Little brown bat
  • Mountain lion
  • Mountain vole
  • Mule deer
  • Nuttall’s (mountain) cottontail
  • Northern pocket gopher
  • Red fox
  • Rock squirrel
  • Striped skunk


  • American crow
  • American kestrel
  • American robin
  • Black-billed magpie
  • Broad-tailed hummingbird
  • Chipping sparrow
  • Common nighthawk
  • Common raven
  • Cooper's hawk
  • Dark-eyed junco
  • Downy woodpecker
  • Mountain bluebird
  • Mountain chickadee
  • Mourning dove
  • Northern flicker
  • Plumbeous vireo
  • Pygmy nuthatch
  • Red-tailed hawk
  • Steller's jay
  • Turkey vulture
  • Violet-green swallow
  • White-breasted nuthatch
  • Wild turkey
  • Western tanager


  • Bullsnake
  • Eastern fence lizard

White Wildflowers

  • Mouse ear chickweed (Cerastium spp)
  • Nodding onion (Allium cernum)
  • Porter aster (Aster porteri)
  • Pussytoes (Antennaria sp)
  • Western white clematis (Clematis ligustylis)
  • Yarrow (Achillea lanulosa)

Yellow Wildflowers

  • Blanket flower (Gaillardia aristata)
  • Golden banner (Thermopsis divaricarpa)
  • Goldenrod (Solidago sp)
  • Gumweed (Grindelia squarrosa)
  • Heart-leaf arnica (Arnica cordifolia)
  • Hairy false golden aster (Heterotheca villosa)
  • Little sunflower (Helianthus pumilus)
  • Sulphur flower (Eriogonum umbellatum)
  • Western wallflower (Erysimum asperum)
  • Whiskbroom parsley (Harbouria trachypleura)
  • Yellow banner (Tradescantia occidentalis)
  • Yellow evening primrose (Oenothera sp)
  • Yellow stonecrop (Amerosedum lanceolatum)

Pink, Orange & Red Wildflowers

  • Fairy trumpet - Scarlet gilia  (Ipomopsis aggregata)
  • Spotted coralroot (Corallorizha maculata)
  • Wild geranium (Geranium caespitosum)

Purple & Blue Wildflowers

  • Common harebell (Campanula rotundifolia)
  • Fireweed (Chamerion angustifolium)
  • Greenleaf (low) penstemon (Penstemon virens)
  • Larkspur (Delphinum nelsoni)
  • Lanceleaf chiming bells (Mertensia lanceolata)
  • Mountain larkspur (Delphinium ramosum)
  • One-sided penstemon (Penstemon secundiflorus)
  • Pasqueflower (Pulsatilla patens)
  • Smooth aster (Aster laevis)
  • Tall chiming bells (Mertensia ciliata)

Green Wildflowers

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


  • Kinnikinnick
  • Oregon grape
  • Prickly rose
  • Yucca


  • Aspen
  • Common juniper
  • Douglas fir
  • Ponderosa pine


Homesteading, Mining, and Ranching

In the 1870s, sawmills and mining operations sprang up along Boulder and Fourmile canyons. The town of Orodell was established at the junction of these two canyons, immediately adjacent to the present Betasso Preserve. A general store, post office and school served the visitors and residents of Orodell. Five stage coaches passed through Orodell daily, en route from Boulder to Nederland. In 1883 most of Orodell was destroyed by a fi re and in 1894 the sawmill and gold mill were destroyed in a flood, never to be rebuilt.

Eighteen years passed before the land above Orodell (now Betasso Preserve) was homesteaded. In 1912 the Blanchard family homesteaded 160 acres. In 1915 Steve Betasso, a hard rock miner from Fourmile Canyon, purchased this small ranch. Steve, together with his sons Dick and Ernie, expanded the ranch with their profits from gold and tungsten mining. Using the Betasso Ranch for their cattle operations, Dick and Ernie wintered the cattle on the ranch, driving the herds to Mammoth Basin in the summer to feed on the lush, high-country rangelands.

Boulder County’s First Open Space Purchase

In 1976, Boulder County purchased 712 acres of the ranch from Ernie Betasso. Ernie wanted others to enjoy his land as he had. Until his death in 1983, Ernie helped the Boulder County Parks and Open Space department oversee Betasso Preserve.

Subsequent purchases include the acquisition of the 391 acre Benjamin Property in 2007. The open space now totals 1,181 acres enjoyed by people and wildlife.


Parks & Open Space

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Parks are open sunrise to sunset
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