With beautiful valleys, picturesque vistas, and forest meadows that seem to cling to the sky, Heil Valley Ranch offers a day’s adventure in the foothills.
Heil Valley Ranch
|Grindstone Quarry Trail
1.4 miles – Easy
1.3 miles – Easy
2.3 miles – Moderate
Bike Direction: Clockwise
|Picture Rock Trail
5.2 miles – Moderate
2.6 miles – Moderate
0.9 miles – Easy
Bike Direction: Counterclockwise
2.5 miles – Moderate
|Wild Turkey Trail
2.9 miles – Moderate
The Main Trailhead parking lot closes at noon due to flash flood concerns. All vehicles still in the parking lot after noon may be ticketed. Trails, picnic tables, and the shelter will remain open until sunset, but visitors must park elsewhere. The parking lot sits in a drainage area between two creeks and is prone to flash flooding as a result of the changed landscape caused by the Cal-Wood Fire.
The south side of the park is prone to flash flooding. The severely burned landscape is likely to flood all small and large canyons and deposit debris and mud in downstream/downslope areas, including the Main Trailhead.
Know Before You Go
- Check the weather forecast.
- Visit another park if rain is anticipated.
- Sign up for emergency alerts.
Be Prepared When at Heil Valley Ranch
- As you travel on trail, identify the flood safety routes.
- Keep your eyes on the sky! You may not be able to receive text messages, alerts, or hear sirens.
- Leave if storm clouds are building.
- Do not drive if you see flooding. Never drive through water if you cannot see the road beneath the water. The road may not be intact under floodwaters.
Visitors are encouraged to sign up to receive reverse 911 emergency messages for potential flooding. Messages are generated by the Office of Emergency Management using Everbridge Alerts.
To add Heil Valley Ranch, use the following address:
1188 Geer Canyon Rd., Boulder CO 80302
Please note, messages can only be received if you have cellular service. The park has limited service depending on the exact area and service provider.
Wapiti Trail Detour
A section of the Wapiti Trail is closed to protect golden eagles. Please follow the detour along the emergency access road.
Golden eagles built a nest in the area during the closure. Boulder County works with Colorado Parks and Wildlife and the U.S. Fish and Wildlife Service to ensure protection of sensitive species. Staff follows federal guidance, such as the Bald and Golden Eagle Protection Act, and the detour allows a half-mile buffer zone between the nest site and areas of human activity. The detour will be in place year-round for the next several years.
Keep in Mind
- The south side of the park was severely affected by the Cal-Wood Fire. Learn more about recovery efforts.
- Dogs are not allowed due to wildlife concerns.
- Conservation areas are closed to the public to protect critical wildlife habitat.
- Emergency access roads exist on the property. Visitors are urged to stay on designated trails since these roads do not always lead to trailheads.
The 6,231 acres of Heil Valley Ranch are home to over 50 species of mammals representing 70 percent of all the mammals found in Boulder County. Nearly 100 types of birds call this area home. Golden eagles and prairie falcons nest in the cliffs and canyons. The variety of wildlife found here is partly due to the diversity of vegetation. Much of the land is covered by ponderosa pine forest. Among the ponderosa pines, a variety of shrubs, grasses, and wildflowers thrive providing coverage for small mammals and food for deer.
- Abert’s squirrel
- Black bear
- 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
- Broad-tailed hummingbird
- Brown-headed cowbird
- Canyon wren
- Chipping sparrow
- Cliff swallow
- Cordilleran flycatcher
- Common nighthawk
- Common raven
- Downy woodpecker
- Dusty grouse
- Golden eagle
- Great horned owl
- Hairy woodpecker
- House wren
- Lazuli bunting
- McGillivray’s warbler
- Mountain bluebird
- Mountain chickadee
- Northern flicker
- Prairie falcon
- Pygmy nuthatch
- Red-tailed hawk
- Rufous-sided (spotted) towhee
- Solitary vireo
- Scrub jay
- Steller’s jay
- Townsend’s solitaire
- Violet-green swallow
- Virginia’s warbler
- Western bluebird
- Western meadowlark
- Western wood-pewee
- Wild turkey
- White-breasted nuthatch
- Yellow-breasted chat
Amphibians & Reptiles
- Eastern fence lizard
- Plains garter snake
- Prairie rattlesnake
- Western terrestrial garter snake
- Daisy fleabane (Erigeron sp)
- Easter daisy (Townsendia grandiflora)
- Mariposa lily (Calochortus gunnisonii)
- Miner’s candle (Cryptantha virgate)
- Mouse ear chickweed (Cerastium sp)
- Nodding onion (Allium cernuum)
- Plains larkspur (Delphinium carolinianum)
- Prickly poppy (Argemone polyanthemos)
- Pussytoes (Antennaria spp)
- Stemless evening primrose (Oenothera caespitosa)
- Wild onion (Allium textile)
- Yarrow (Achillea lanulosa)
- Blanketflower (Gaillardia aristata)
- Cinquefoil (Drymocallis spp)
- Golden banner (Thermopsis divaricarpa)
- Gumweed (Grindelia squarrosa)
- Hairy false golden aster (Heterotheca villosa)
- Stonecrop (Amerosedum lanceolatum)
- Sulphur flower (Eriogonum umbellatum)
- Sunflower (Helianthus sp)
Pink & Red Wildflowers
- Ball cactus (Coryphantha vivipara)
- Showy milkweed (Asclepias speciosa)
- Wild geranium (Geranium caespitosum)
- Fringed (silver) sage (Artemisia frigida)
- White (prairie) sage (Artemisia ludoviciana)
Purple & Blue Wildflowers
- Horsemint (Monarda fistulosa)
- Blue flax (Adenolinum spp.)
- Colorado loco (Oxytropis lambertii)
- Common harebell (Campanula rotundifolia)
- Fleabane (Erigeron sp)
- Gayfeather (Liatris punctuta)
- Larkspur (Delphinium nutallianum)
- Low Penstemon (Penstemon virens)
- One-sided penstemon (Penstemon secundiflorus)
- Pasqueflower (Pulsatilla ludoviciana)
- Silver lupine (Lupinus argenteus)
Shrubs & Cactus
- Common juniper
- Mountain maple
- Mountain mahogany
- Oregon grape
- Prickle-pear cactus
- Three-leaf sumac
- Douglas fir
- Ponderosa pine
- Rocky Mountain juniper
At Heil Valley Ranch you see the dramatic landscape where the Great Plains meet the Southern Rocky Mountains. The eastern-most ridge (hogback) at Heil Valley Ranch is capped by a rock layer called the Dakota Formation. On the west side of this property is another series of ridges that look red; this is the Lyons sandstone. This fine-grained sandstone, named after the town of Lyons, has been quarried locally and used for building throughout Boulder County.
From Mountainside To University
The Whitestone and Vickery Quarry Complex along the Picture Rock Trail operated from the 1890s to the 1960s. It was one of the more important quarry operations in the Lyons area. Lyons sandstone was mined there and can be seen in buildings on the University of Colorado campus.
Heil As Home
Four prehistoric sites (i.e. Native American sites used prior to contact with Anglo settlers) are on the property at Heil Valley Ranch. The first Anglo populations in the area were most likely beaver trappers exploring nearby rivers in the late eighteenth and early nineteenth centuries. One of the first Anglo females to reside in Boulder County was Nancy Phinox Geer, who settled here with her husband Solomon Geer in 1888.
You may spot a few old stone buildings used by ranch hands, as well as a silo in a meadow up the Picture Rock trail.
The majority of Heil Valley Ranch was purchased in 1993 and 1994 as part of the North Foothills Open Space that includes Hall Ranch and surrounding conservation easement properties.
The Cal-Wood Fire started on Oct. 17, 2020, and raced downwind and downslope through Heil Valley Ranch. It consumed 5,000 acres in about five hours. In the end, it covered over 10,000 acres with more than half of that on Boulder County owned property (4,400 acres) and conservation easements (1,400 acres).