North Boulder ยท Open grassland

Boulder Valley Ranch

Boulder Valley Ranch is an open-grassland Boulder Open Space and Mountain Parks area north of town, with wide, rolling, almost entirely shadeless multi-use trails, long Front Range views, and free trailhead parking off Longhorn Road.

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Boulder Valley Ranch quick facts

Trails
The Boulder Valley Ranch Trailhead reaches Sage, Eagle, Cobalt and Left Hand, and connects on to Degge, Foothills North, Hidden Valley, Mesa Reservoir and the newer Shale Trail.
Difficulty
Easy to moderate. OSMP calls Sage and Eagle mellow trails, and lists Sage as mobility-friendly. The rolling mesa climbs are short rather than steep.
Trailhead
One mile north of Boulder on Highway 36, then one mile east on Longhorn Road, a dirt road. The turn is signed for Boulder Valley Ranch Open Space, and the lot is on the south side of Longhorn Road. Open 5 a.m. to 11 p.m. daily.
Parking
Free. There are 14 standard spaces plus 1 ADA space, and a restroom at the trailhead. Boulder Valley Ranch isn't one of OSMP's parking-fee locations, so no permit is needed.
Bikes
Allowed on the Eagle, Sage, North Rim, Cobalt and Left Hand Trails. Class 1 and Class 2 e-bikes are allowed on Eagle, Sage, North Rim and Left Hand. Shale Trail is hikers and horses only.
Dogs
Leashed by default. Dogs must be on a hand-held leash unless they meet the voice and sight control standard and wear a City of Boulder Voice and Sight tag. Under the Trailhead Leash Program, leash up the moment you get out of the car.
Cattle
This is working ranch country inside OSMP's agricultural lands. Where cattle are present on open space, OSMP asks visitors not to approach them, never to get between a cow and her calf, to leash dogs, to keep a safe distance, and to always close gates behind you.
Best season
Spring, fall and winter. The trails are open, dry grassland with almost no shade, which makes summer midday hot and exposed. The area closes when conditions are too muddy, so check OSMP's muddy trail closures page after snow or rain.

Boulder Valley Ranch at a glance

Boulder Valley Ranch is the flip side of the Flatirons. Instead of climbing into shady pine and rock, you're out on a mesa of prairie grass and yucca with the whole Front Range laid out to the west. The trails are wide, rolling, and easy underfoot, which is why this is trail-running and mountain-biking country as much as it is hiking country, and why you'll pass horses out here too. It's also a working landscape, not a park, so cattle, gates, and ranch infrastructure are part of the deal.

The Boulder Valley Ranch trailhead and parking

The trailhead is one mile north of Boulder on Highway 36, then one mile east of the highway on Longhorn Road, a dirt road. The turn is signed for Boulder Valley Ranch Open Space, and the parking lot is on the south side of Longhorn Road. OSMP lists 14 standard spaces plus 1 ADA space, so it's a small lot for a popular area, and there's a restroom on site but no picnic facilities. The trailhead is open 5 a.m. to 11 p.m. daily. Parking is free: Boulder Valley Ranch isn't one of OSMP's fee locations, which are limited to Flagstaff Mountain, Gregory Canyon, Doudy Draw, Flatirons Vista, Greenbelt Plateau, Marshall Mesa, South Boulder Creek West and South Mesa. If you're bringing a horse trailer, OSMP says trailer parking is possible here but there are no designated horse-trailer spaces.

The trails: Sage, Eagle, Mesa Reservoir, Hidden Valley and Cobalt

From the lot you can reach Sage, Eagle, Cobalt and Left Hand directly, and connect on to Degge, Foothills North, Hidden Valley, Mesa Reservoir and the newer Shale Trail. Sage and Eagle are the classic pairing: OSMP describes both as mellow multi-use trails you can walk out and back or link into a longer loop, with birds of prey, prairie dogs and the occasional rattlesnake for company. Sage is also flagged as mobility-friendly.

For a little more interest, the Mesa Reservoir Trail pairs with Eagle to make a short, gentle loop around Mesa Reservoir, with views over the ranch, the Flatirons and Boulder Reservoir, and waterfowl and frogs down at the water when it holds rain. Hidden Valley runs along a narrow bench through rolling fields and tops out on a hill with a distant Flatirons view. Shale Trail is the newest piece, climbing from the trailhead to the mesa-top to meet Eagle, and it was built as a deliberately bike-free experience for hikers and riders on horseback.

Mountain biking and e-bikes

Bikes are allowed on the Eagle, Sage, North Rim, Cobalt and Left Hand Trails, and OSMP's rule of thumb applies everywhere: ride only where the international bicycle symbol is posted. Class 1 and Class 2 e-bikes are allowed on Eagle, Sage, North Rim and Left Hand. OSMP has been rebuilding trails out here under the North Trail Study Area plan, including reroutes of Degge and Hidden Valley intended to open both to multi-use access once construction wraps, so the map in your app may lag what's actually signed on the ground.

No shade, and what that means in summer

There's essentially no tree cover at Boulder Valley Ranch. OSMP's own description of Hidden Valley puts it plainly: no shade on this dry route, just grasses, yucca and chattering prairie dogs. That's wonderful in March and lovely in November, and it's punishing at 2 p.m. in July. Go early, bring more water than the distance suggests, wear a hat, and remember there's no creek to cool off in out here. Afternoon thunderstorms are a real hazard on an open mesa with nowhere to hide, so watch the sky and turn around early.

Cattle, gates and prairie dogs

Boulder Valley Ranch sits inside OSMP's working agricultural system: the department leases about 15,000 acres of working farm and ranch lands to dozens of farmers and ranchers, and traditional livestock grazing is part of how it keeps native grassland healthy. OSMP doesn't publish a grazing calendar for this trailhead, so treat cattle as possible rather than guaranteed, and read the signs posted at the gates. Where cattle are on open space, OSMP's rules are: don't approach them, never get between a cow and her calf, leash your dog, keep a safe distance, don't damage or remove a gate, and always close gates behind you. Prairie dog towns are the other constant here, and they bring in the raptors, so it's a good place for eagles, northern harriers and red-tailed hawks. Mule deer and coyotes are common, and both rattlesnakes and bull snakes live in the grass, so keep dogs close on warm days.

Best season, and the mud rule

Spring, fall and winter are when this place shines. The catch is mud: OSMP closes the Boulder Valley Ranch area, including Eagle's western section, Mesa Reservoir and Hidden Valley, when conditions are too wet, because these clay and shale soils rut badly. After snow or rain, check OSMP's muddy trail closures page before you drive out. Winter mornings after a dry spell are the sweet spot: firm ground, low sun on the Flatirons, and hardly anyone around.

Nearby trails and guides

Boulder Valley Ranch FAQ

Where is the Boulder Valley Ranch trailhead?

It's one mile north of Boulder on Highway 36, then one mile east of the highway on Longhorn Road, which is dirt. The turn-off is marked with a sign for Boulder Valley Ranch Open Space, and the parking lot sits on the south side of Longhorn Road. The trailhead is open 5 a.m. to 11 p.m. daily and has a restroom but no picnic facilities.

Is there any shade at Boulder Valley Ranch?

Almost none. These are open grassland trails, and OSMP's own description of the Hidden Valley Trail says there's no shade on the dry route, just grasses, yucca and prairie dogs. That makes summer afternoons hot and exposed, so go early, carry more water than you think you need, and save this one for the cooler shoulder seasons and winter when you can.

Are there cattle at Boulder Valley Ranch, and what should I do if I see them?

It's a working agricultural landscape, and OSMP leases roughly 15,000 acres of working farm and ranch land across its system, so livestock can be out. OSMP's rules where cattle are present are simple: don't approach cattle, never get between a cow and her calf, leash your dog, keep a safe distance, don't damage or remove a gate, and always close gates behind you. OSMP doesn't post a grazing calendar for this trailhead, so treat cattle as possible rather than guaranteed and read the signs at the gates.

Can you mountain bike at Boulder Valley Ranch?

Yes, on designated trails. OSMP allows bikes on the Eagle, Sage, North Rim, Cobalt and Left Hand Trails, and Class 1 and Class 2 e-bikes on Eagle, Sage, North Rim and Left Hand. The Shale Trail, which climbs from the trailhead to the mesa-top and meets Eagle, is deliberately hikers and equestrians only. Look for the international bicycle symbol posted at the trail you want.

Are dogs allowed off leash at Boulder Valley Ranch?

Only with a tag. Dogs must be on a hand-held leash at all times unless they meet OSMP's voice and sight control standard and display a City of Boulder Voice and Sight tag. The Trailhead Leash Program also requires you to leash your dog as soon as you step out of your vehicle and through the trailhead area. Picking up after your dog is required by law, and there's a dog station at the trailhead.

Sources

Facts on this page are drawn from these authoritative sources:

Last checked . We verify trail facts against the managing agency, and we say so when a figure isn't published.