Area - Boulder - Denver - Golden - Fort Collins - Lyons
Boulder - Denver - Golden - Fort Collins - Lyons
Boulder - Denver - Golden - Fort Collins - Lyons
Anne U. White Trailhead
Barr Lake State Park - Nature Center Trailhead
- Gazebo Boardwalk Trail - 3.1 miles roundtrip - Dogs Allowed
- Lake Perimeter Trail - 8.9 miles roundtrip - Dogs Allowed
- Niedrach Nature Loop - 0.6 miles roundtrip - Dogs Allowed
Boulder Falls Trailhead
- Boulder Reservoir Loop - 5.25 miles roundtrip - Dogs Allowed
- Coot Lake - 1.2 miles roundtrip - Dogs Allowed
- Eagle - Sage Lollipop Loop - 3.75 miles roundtrip - Dogs Allowed
Button Rock Preserve Trailhead
- Ralph Price Reservoir - 3.8 miles roundtrip - Dogs Allowed
- Sleepy Lion Trail - Button Rock Dam Loop - 4.7 miles roundtrip - Dogs Allowed
Ceran St. Vrain Trailhead - Jamestown
Chautauqua Park Trailhead
- Bear Peak via The Mesa Trail and Bear Canyon - 12.95 miles roundtrip - Dogs Allowed
- Fern Canyon Trail to Bear Peak - 8.3 miles roundtrip - Dogs Allowed
- Flatiron #1 - 2.9 miles roundtrip - Dogs Allowed
- Flatiron Loop Trail - 2.1 miles roundtrip - Dogs Allowed
- Green Mountain Loop - 9.75 miles roundtrip - Dogs Allowed
- Mallory Cave - 5.4 miles roundtrip - Dogs Allowed
- McClintock - Enchanted Mesa Loop - 2.05 miles roundtrip - No Dogs Allowed
- Royal Arch - 3.2 miles roundtrip - Dogs Allowed
- The Mesa Trail - 13.4 miles roundtrip - Dogs Allowed
Doudy Draw Trailhead
- Doudy Draw - Spring Brook Loop Trail - 5.2 miles roundtrip - No Dogs Allowed
- Doudy Draw Trail to Flatirons Vista Trailhead - 6.8 miles roundtrip - Dogs Allowed
Eldorado Canyon State Park - Walker Ranch
- Eldorado Canyon - Walker Ranch Lollipop Loop - 14.0 miles roundtrip - Dogs Allowed
- Eldorado Canyon Trail - 8.5 miles roundtrip - Dogs Allowed
- Fowler Trail - Self Guided Nature Walk - 1.4 miles roundtrip - Dogs Allowed
- Rattlesnake Gulch Trail - 2.4 miles roundtrip - Dogs Allowed
- South Boulder Creek Trail - 5.0 miles roundtrip - Dogs Allowed
- Walker Ranch Loop - 7.7 miles roundtrip - Dogs Allowed
Eldorado Mountain Trailhead
- Fowler Trail - 4.0 miles roundtrip - Dogs Allowed
- Goshawk Ridge Trail - Spring Brook North Loop - 4.05 miles roundtrip - No Dogs Allowed
Elk Meadow Park
- Bergen Peak - 9.4 miles roundtrip - Dogs Allowed
- Bergen Peak via the Too Long Trail - 9.6 miles roundtrip - Dogs Allowed
- Elk Meadow Loop - 3.5 miles roundtrip - Dogs Allowed
- Boy Scout Loop - 1.0 miles roundtrip - Dogs Allowed
- Tenderfoot Loop Trail - 2.2 miles roundtrip - Dogs Allowed
- Ute Trail - Range View Trail Loop - 1.1 miles roundtrip - Dogs Allowed
Four Mile Creek Trailhead
Golden Gate Canyon State Park
- Burro Trail to Windy Peak - 6.35 miles roundtrip - Dogs Allowed
- Frazer Meadows via Mule Deer Trail - 4.9 miles roundtrip - Dogs Allowed
- Mountain Lion Loop Trail & Windy Peak - 7.9 miles roundtrip - Dogs Allowed
- Panorama Point via Mule Deer Trail - 11.0 miles roundtrip - Dogs Allowed
- Raccoon Loop Trail - 2.3 miles roundtrip - Dogs Allowed
Gregory Canyon Trailhead
- Green Mountain - 5.45 miles roundtrip - Dogs Allowed
- Green Mountain - Bear Peak Trail (Green and Bear It) - 12.75 miles roundtrip - Dogs Allowed
Greyrock Mountain Trailhead - Fort Collins
- Bitterbrush Trail to Nelson Loop - 9.4 miles roundtrip - No Dogs Allowed
- Button Rock Trail - 4.0 miles roundtrip - No Dogs Allowed
- Nighthawk Trail - 9.4 miles roundtrip - No Dogs Allowed
Heil Valley Ranch - Main Trailhead
- Lichen Loop Trail - 1.25 miles roundtrip - No Dogs Allowed
- Wapiti Trail to Ponderosa Loop - 7.7 miles roundtrip - No Dogs Allowed
- Wild Turkey Loop - 9.45 miles roundtrip - No Dogs Allowed
Heil Valley Ranch - Picture Rock Trailhead
Horsetooth Mountain Open Space Park - Fort Collins
- Horsetooth Falls - 2.35 miles roundtrip - Dogs Allowed
- Horsetooth Mountain Loop - 7.1 miles roundtrip - Dogs Allowed
- Horsetooth Rock - 5.0 miles roundtrip - Dogs Allowed
Lion Gulch Trailhead
- Lion Gulch Trail to Homestead Meadows - 6.1 miles roundtrip - Dogs Allowed
- Lion's Paw Trail to Pierson Park - 14.2 miles roundtrip - Dogs Allowed
Marshall Mesa Trailhead
- Marshall Mesa Loop - 3.3 miles roundtrip - Dogs Allowed
- Marshall Valley - Cowdrey Draw Trail - 4.0 miles roundtrip - Dogs Allowed
Mt Sanitas Trailhead - Mapleton Road
Mud Lake Open Space
NCAR Mesa Trailhead
North Foothills Trailhead
North Table Mountain Park Trailhead - Golden
- North Table - Tilting Mesa - Mesa Top Loop - 3.2 miles roundtrip - Dogs Allowed
- North Table Loop - 5.9 miles roundtrip - Dogs Allowed
Pawnee National Grasslands - Pawnee Buttes Trailhead
Rabbit Mountain Trailhead
- Eagle Wind Trail - 3.95 miles roundtrip - Dogs Allowed
- Little Thompson Overlook Trail - 2.9 miles roundtrip - Dogs Allowed
Settlers' Park Trailhead
South Boulder Creek Trailhead
South Mesa Trailhead
- Mesa Trail - Big Bluestem Trail Loop - 4.35 miles roundtrip - Dogs Allowed
- Shadow Canyon to Bear Peak - 6.8 miles roundtrip - Dogs Allowed
- Shadow Canyon to South Boulder Peak - 6.7 miles roundtrip - Dogs Allowed
Teller Farms Trailhead - South
Twin Lakes Open Space
Waneka Lake Park - City of Lafayette
White Ranch Park in Golden
- Belcher Hill - Rawhide - Longhorn - Whippletree Loop - 8.8 miles roundtrip - Dogs Allowed
- Belcher Hill Trail - 9.0 miles roundtrip - Dogs Allowed
- Belcher Hill Trail to Mustang Trail - 9.0 miles roundtrip - Dogs Allowed
- Rawhide Loop Trail - 4.7 miles roundtrip - Dogs Allowed
- Sawmill Trail - 2.95 miles roundtrip - Dogs Allowed
- Shorthorn to Longhorn Trail - 5.2 miles roundtrip - Dogs Allowed
Boulder - Denver - Golden - Fort Collins - Lyons - Photos
- Anne U. White Trail
- Barr Lake State Park
- Bear Peak via The Mesa Trail and Bear Canyon
- Bergen Peak and Elk Meadow Park
- Big Bluestem - Mesa Trail Loop
- Boulder Falls Trailhead: Boulder Falls
- Boulder Reservoir
- Ceran St. Vrain Trail
- Chautauqua Park: Flatiron #1
- Chautauqua Park: Green Mountain Loop
- Chautauqua Park: Mallory Cave
- Chautauqua Park: Royal Arch Trail
- Chautauqua Park: The Mesa Trail
- Doudy Draw Trail - Spring Brook Loop
- Eldorado Canyon State Park: Eldorado Canyon and Walker Ranch
- Eldorado Canyon State Park: Fowler Trail
- Eldorado Canyon State Park: Rattlesnake Gulch Trail
- Fern Canyon to Bear Peak
- Golden Gate Canyon State Park: Burro Trail and Windy Peak
- Golden Gate Canyon State Park: Frazer Meadows - Panorama Point
- Golden Gate Canyon State Park: Mountain Lion Loop Trail
- Golden Gate Canyon State Park: Raccoon Loop Trail
- Goshawk Ridge Trail - Spring Brook North Loop
- Green Mountain and Bear Peak
- Greyrock Mountain - Greyrock Meadows
- Hall Ranch
- Heil Valley Ranch
- Heil Valley Ranch: Lichen Loop Trail
- Hogback Lollipop Loop Trail
- Horsetooth Mountain Park: Horsetooth Rock and Horsetooth Falls
- Lion Gulch Trailhead: Lion Gulch Trail to Homestead Meadows
- Lion Gulch Trailhead: Lion's Paw Trail to Pierson Park
- Mallory Cave - NCAR route
- Marshall Mesa Trailhead: Marshall Mesa Loop
- Marshall Mesa Trailhead: Marshall Valley - Cowdrey Draw Trail
- McClintock - Enchanted Mesa Loop Trail
- Mt Sanitas Trail
- Mud Lake Open Space - Tungsten & Kinnickinnick Double Loop
- North Table Mountain Park
- Pawnee Buttes - Pawnee National Grasslands
- Rabbit Mountain: Eagle Wind Trail
- Rabbit Mountain: Little Thompson Overlook Trail
- Settlers Park - Red Rocks Trail
- Sleepy Lion Trail, Button Rock Trail and Ralph Price Reservoir
- South Boulder Creek - Big Bluestem Loop
- South Boulder Peak and Bear Peak via Shadow Canyon
- Teller Farms - East Boulder Trail and White Rocks Preserve
- Twin Lakes Open Space - Great Horned Owl Photos
- White Ranch Park: Belcher Hill Trail - Longhorn Trail - Rawhide Loop
- White Ranch Park: Rawhide Loop Trail
- White Ranch Park: Sawmill Trail
- Wonderland Lake
Boulder - Denver - Golden - Fort Collins - Lyons - Geology
Colorado's Front Range communities lie where the Great Plains abruptly meet the Rocky Mountains. This geologically complex transition zone runs north - south throughout Colorado and physically divides the state. Cities like Ft. Collins, Boulder, Golden and Colorado Springs lie at the eastern base where elevations range 5,200' - 8,500'. The Front Range's granitic mountains came to be over billions of tumultuous years:
The oldest rocks in the Front Range are carbon dated at 1.7 billion years old, or simply "Precambrian". The term Precambrian does not refer to an era, but rather a period 570M years ago considered the first geologic epoch of Earth. Precambrian rock consists of both metamorphic and granitic rock; metamorphic rock being older and generally found in the Boulder foothills.
Precambrian rock was buried deep and subjected to intense heat, pressure and chemical reactions that led to their present form. Schist, gneiss, and quartzite are the three most common types of metamorphic rock in the Colorado Front Range.
Once an ocean...
The Front Range was gradually flooded by a vast ocean around 600 million years ago at the beginning of the Paleozoic era.
In addition to marine deposits, sand and lime mud was deposited on beaches and buried under other sedimentary rock, eventually becoming sandstone and limestone. This area would subsequently flood and recede several times over the next 300 million years creating new, distinct strata each time.
The Ancestral Rockies formed around 300 million years ago when tectonic activity thrust 2 great mountain ranges in central and western Colorado up, exposing deeply buried Precambrian rock high above the surface. As Precambrian rock eroded, sediments were carried away, settled and compressed into sandstone and shale rock called the Fountain Formation.
Boulder's Flatirons and Sanitas Ridge are both part of the Fountain Formation.
Around 260 million years ago (the Permian period), waters receded and great sand dunes covered the area, shifting and essentially burying the original Fountain Formation.
The dunes, however, led to the creation of Lyons Sandstone. Well known for its pinkish hue, the Lyons Sandstone is commonly used in building construction and cannot be missed when driving through Lyons, Colorado. Layers of Lyons sandstone is exposed throughout Hall Ranch.
The Front Range was crossed by vast flood plains at the end of the Permian period. Rivers carried silt and sediment from the mountains down to the east, covering Lyons sandstone of the Permian period.
The sea returned from the north and south at the start of the Cretaceous period (140M years ago), beginning a cycle of advances and retreats over the next 100 million years.
Shale, coal, limestone and sandstone were the most common layers of sedimentary rock associated with this period. The ocean finally withdrew from Colorado at the end of the Cretaceous period.
There's Gold in them thar' hills
Around 70 million years ago in the late Cretaceous period, geologic forces triggered another round of mountain building.
Magma bubbled up through existing mountains and foothills to create bigger mountains and foothills. Sizzling magma heated mineralized water that seeped through cracks in the rock, leaving behind vast deposits of metallic ore. This was the beginning of Colorado's geologic gold rush.
As magma spewed to the Earth's surface from distant volcanoes, tectonic activity shaped the core of today's Front Range and Rocky Mountains.
Shifting ground and tectonic uplift tilted the Fountain Formation on its side. As the Fountain Formation broke through the Earth's surface, erosion shaped exposed rock into the iconic Boulder Flatirons.
During this time of mountain building and uplift, crushed rock and debris were once again brought down to the eastern plains by water. Hills and mesas across the Front Range were comprise these massive sedimentary deposits.
Today, the Front Range is experiencing a period of relative geologic calm. Volcanic activity is dormant, tectonic activity is virtually non-existent and in general, the geologic picture is stable.
Boulder - Denver - Golden - Fort Collins - Lyons - Wildlife
Colorado's Front Range lies where the Great Plains meet the Rocky Mountain uplift. Three distinct ecosystems with overlapping areas support a wide range of plants and animals in a relatively small space.
At least 18 amphibians, 48 reptiles, 123 mammals and 408 birds live in the Colorado Front Range at some point in their lifecycle.
Prairies of the high desert grassland steppe (5,000' - 5,500') are home to burrowing owls, badger, rabbit, rattlesnakes, ferruginous hawks and golden eagles.
The foothills' open ponderosa parks and pinyon-juniper woodlands (5,500' - 7,000') support turkey, mule deer, bear, bobcat, mountain lion and goshawk.
Coniferous montane forests (7,000' - 8,500') are visited by elk, moose and even bighorn sheep on their annual winter migrations from the high country to more hospitable conditions at lower elevations.
Black bears come in a variety of colors including cinnamon brown, pale white and a bluish hue.
They do not have a hump, which makes them easy to discern from grizzlies. Black bear claws are also much darker and shorter than a grizzly's.
Black bears have color vision but poor eyesight, so they rely on a keen, directional sense of smell to navigate the wilderness and find food. They're opportunistically omnivorous, but primarily vegetarian.
Black bears do hibernate, but seldom sleep soundly through the entire winter. Bears occasionally wake up during hibernation and 'sleep walk' to find some food, drink water and go to the bathroom.
While not physiologically necessary, bears may wake during warm spells which falsely signal the onset of spring. Upon realizing that winter is still in full swing, bears will retreat to their dens. Hibernation may last 5-6 months depending on elevation, climate and available food.
Mountain Lions have the widest distribution of any native mammal in the Western Hemisphere.
Once hunted aggressively, populations have stabilized and are even moving east across the plains. Some models suggest mountains lions may reach east coast mountain ranges within the next 20 years.
Mountain lions are primarily nocturnal and sightings are infrequent, though certainly not rare. They prey mainly on deer and elk, but readily pursue birds, rabbits, porcupines and other small mammals when opportunities or conditions warrant.
On average, a mountain lion will consume one deer per week.
A mountain lion will cover the remains of its prey with brush, and return periodically to feed ("caching"). If you find a cache, leave the area immediately - there's almost certainly a hungry mountain lion in the vicinity.
Coyotes are known for their adaptability and resilience, and accordingly are found throughout North America in variety of environments. Coyotes are carnivorous but not especially fickle: they feed on everything from small mammals, berries and grasses to the occasional left-over kill of another animal.
Coyotes are long distance runners, excellent jumpers and don't mind the water in pursuit of prey. They live in dens, which are usually located in hollow trees, burrows of another animal, caves or in dense brush.
Coyote pups are generally born in late spring and able to survive on their own by next fall. Coyotes are active both day and night.
A great way to distinguish canine and feline prints is by claw marks. If you see a print you are unsure about, look for claw marks. If you see them, more than likely the track was left by a canine. Felines have retractable claws and rarely show their claws in a track.
Unlike bald eagles of the Colorado Front Range, golden eagles are not true migrants. Because their diet consists of perennially available small to medium-size mammals, these eagles simply expand their home territory during winter.
Golden eagles tend to use the same nest site for many generations, employing pine boughs to enlarge or repair old nests. These scented boughs help control parasites by repelling insects that find the smell unappealing.
Females are generally larger than males; juveniles tend to be much darker than adults.
Peregrine Falcons range across North America but are uncommon in general.
Plumage varies distinctly between adults and juveniles. Adults have dark heads with dark mustache marks that contrast sharply with black streaking on white underparts.
Juveniles have darker underparts, and the black streaking is not quite as prominent.
Peregrines prefer ledges and cliff faces to nests in a tree. These inaccessible sites are known as eyries.
Due to successful habitat management and breeding programs, peregrine falcons were downgraded from "Endangered" to "Threatened" on the federal endangered species list in 1999.
Prairie Falcons look similar to peregrines, though its coloration is generally more pale. Rather than a stark black and white contrast, prairie falcons have gray spots on a much whiter underside.
Boulder - Denver - Golden - Fort Collins - Lyons - Ecology
Colorado's Front Range spans three distinct ecosystems with overlapping areas that support a wide range of plants in a relatively small space.
An estimated 700+ species of trees, shrubs, flowers and grasses inhabit Front Range Open Space and Mountain Parks; geology, elevation and climate heavily influence local populations and compositions.
Many of today's plant species evolved in the area, while others migrated here when the climate was quite different, or came recently by accidental or purposeful human introduction.
Native Front Range ecosystems include grasslands, high desert grassland steppes and montane forests, each interspersed with wetland and riparian sub-systems.
Grasslands (5,000' - 5,500')
Tall grass prairies once stretched east from the Rockies to Indiana, north to Canada and south through Texas. Only 2% of its original composition remains, much of it re-purposed by man or overtaken by mixed grass prairie.
Native short, mid and tall prairie grasses can still be found in protected areas across the Front Range, including bluestem, switchgrass, king spike fescue, western wheatgrass, prairie junegrass, sideoats grama, blue grama and buffalograss.
Intact foothills grasslands exist in small pockets along mountain-front areas. These include a mixture of mid-grasses on drier slopes, and tall grasses in wetter spaces.
Invasive weeds are a constant threat to native grassland habitat.
High Desert Grassland Steppe - Foothills (5,500' - 7,000')
As elevations increase near the foothills, open grasslands mix with ponderosa pine and pinyon-juniper woodlands.
Periodic, low intensity fires are crucial to a healthy ponderosa-grassland ecosystem. Naturally occurring fires clear space for mature trees, keep densities in check and rejuvenate soils.
Ponderosa pine not only survive such fires, but require it to open their cones for reproduction.
Fire suppression since the 1880s has created unsustainable forest densities that can result in destructive, high intensity fires. It's thought that only a few dozen trees once occupied an acre of land in the foothills, whereas today they can exceed thousands.
Foothills - Montane (6,000' - 8,500')
Coniferous trees dominate the upper Colorado foothills.
Primary constituents include pinyon pine, ponderosa pine and lodgepole pine. Douglas-fir, blue spruce, white fir and limber pine may be found in higher, western locations. Juniper is a ubiquitous member of the cedar family found from the grasslands to upper foothills.
Deciduous residents (trees that drop their leaves during winter) include aspen, Rocky Mountain maple, mountain ash, boxelder, cottonwood, willow, alder and birch. Most require proximity to water for survival.
Common shrubs in the transition from steppe to montane include juniper, chokecherry, smooth sumac, skunkbush, wild plum, hawthorn, beaked hazelnut, wax currant, Boulder raspberry, wild raspberry, ninebark, snowberry, and serviceberry.
May and June see peak wildflower blooms in the Colorado Front Range.
Common flowers include gaillardia, golden banner, spring beauty, chiming bells, western wallflower, arnica, larkspur, lupine, penstemon, sand lily, yucca, prickly pear, cinquefoil, Indian paintbrush, wild geranium, harebells, wild iris, wood lily, shooting star, mariposa lily, monkshood, goldenrod and blazingstar.
The White Adder's Mouth Orchid, which grows wild on Green Mountain in Boulder, is not known to grow on any other site in Colorado. The Ute Ladies' Tresses Orchid is also quite rare in the western US, but found here.
Wood Lilies are listed as rare and imperiled by the Colorado Natural Heritage Program. Collecting has been a factor in this plant's decline. The vanishing Prairie Gentian wildflowers are protected on Front Range pastures. They occur in wet meadows east of Boulder, such as the Lower Boulder Creek Habitat Conservation Area.
Boulder - Denver - Golden - Fort Collins - Lyons - Contact
The Colorado Front Range is adminstered by multiple local, county, state and federal agencies. Each trail may be managed by one or multiple agencies. While specific contact information is listed on every trail page, the following is a list of contact information for the most popular areas.
Boulder County Parks and Open Space
5201 St. Vrain Road
Longmont, CO 80503
Barr Lake State Park and Wildlife Refuge
13401 Picadilly Road
Brighton, CO 80603
Office Hours: 9AM - 4PM Wed - Sun, Closed Mon and Tues
Park Hours: 5AM - 10PM
Button Rock Preserve and Ralph Price Reservoir
Managed by Longmont Water Utilities
Eldorado Canyon State Park:
Golden Gate Canyon State Park
3873 Highway 46
Golden, CO 80403
Waneka Lake Park
City of Lafayette Parks Department
Phone: 303-665-5506 extension 3610
White Ranch Park
Jefferson County Open Space
700 Jefferson County Pkwy, Suite 100
Golden, Colorado 80401
Phone: 303-271-5925 (information line)