Teller Farms - East Boulder Trail, Teller Farms Trailhead - South, Boulder - Denver - Golden - Fort Collins - Lyons, Colorado

Teller Farms - East Boulder Trail - 12.3 miles

Teller Farms Trailhead - South

The East Boulder Trail climbs the rolling short grass prairies of White Rocks Preserve

The East Boulder Trail climbs the rolling short grass prairies of White Rocks Preserve

Round-Trip Length: 12.3 miles
Start-End Elevation: 5,220' - 5,308' (5,423' max elevation)
Elevation Change: +88' net elevation gain (+787' total roundtrip elevation gain)
Skill Level: Easy-Moderate
Dogs Allowed: Yes
Bikes Allowed: Yes
Horses Allowed: Yes
Related Trails:

Teller Farms - East Boulder Trail - 12.3 Miles Round-Trip

The East Boulder Trail stretches 6.15 miles from the Teller Farms - South Trailhead off Arapaho Road to the Gunbarrel Farm Trailhead in the Heatherwood neighborhood of Gunbarrel.

The trail passes through the working historic ranch of Teller Farms, White Rocks Nature Preserve, Lower Boulder Creek Conservation Area and rolling hills of a short grass prairie. Groomed trails, mild grades, and a bucolic setting welcome runners, cyclists, birdwatchers, and skiers.

The following description begins at the Teller Farms - South Trailhead and travels north:

The East Boulder Trail heads east on a wide gravel path to the Teller Lake spur (.2 miles) and bends north. It moves easily through the ranch, making several dog-leg turns along property lines before straightening out for lengthy spell (.75 miles). The path is crossed by several creeks and irrigation ditches lined by old-growth cottonwood stands, ideal places to see hawks, eagles and owls - especially in the bareness of winter.

The trail passes through a cattle gate (1.95 miles) and into the Teller Farms - North Trailhead parking lot on Valmont Road (2.15 miles : 5,125'). It exits the northwest corner of the lot and traces Valmont Road for .25 miles before crossing north into the White Rocks Trailhead parking lot (2.4 miles : 5,092').

The trail officially enters the White Rocks Nature Preserve - Lower Boulder Creek Conservation Area and skirts a large pond home to a diverse waterfowl population. It continues over South Boulder Creek to the base of a ridge comprised of the eponymous white rocks and forks left (3.45 miles : 5,085').

The trail narrows and begins a moderate climb with panoramas of Boulder's front range, and useful perspective on the patchwork landscape through which you're passing. Look for prairie dogs, fox, coyote, rattlesnakes and burrowing owls in the prairie. The trail crests (4.35 miles : 5,230'), crosses a residential access road (4.4 miles : 5,221') and resumes an undulating course through a subtly textured expanse.

You'll reach the Gunbarrel Hill - 95th Street junction (4.45 miles : 5,205') and turn left on the East Boulder Trail (a right turn leads to alternative access on 95th street). Follow dog-leg turns west, north and west again on a steady climb up Gunbarrel Hill. The trail crests beside a utility facility (5.45 miles : 5,407') and drops gently to its terminus at the Gunbarrel Farm Trailhead (6.15 miles : 5,308')

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Interactive GPS Topo Map

Key GPS Coordinates - DATUM WGS84

  • N40 01.310 W105 09.511 — Teller Farms Trailhead - South
  • N40 01.315 W105 09.277 — .2 miles : Teller Lake split
  • N40 02.181 W105 08.539 — 1.95 miles : Pass through gate to Valmont parking lot
  • N40 02.419 W105 08.760 — 2.40 miles: Resume trail at White Rocks Trailhead
  • N40 03.129 W105 08.656 — 3.45 miles : Trail forks at base of hill; veer left
  • N40 03.659 W105 08.442 — 4.35 miles : Crest second large hill and cross road
  • N40 03.732 W105 08.430 — 4.45 miles : Bear left on East Boulder Trail
  • N40 03.733 W105 09.008 — 4.95 miles : Bear right at fork and climb Gunbarrel Hill
  • N40 03.919 W105 09.333 — 5.45 miles : Level out atop Gunbarrel Hill
  • N40 03.929 W105 10.143 — 6.15 miles : Gunbarrel Farm Trailhead

Worth Noting

  • Respect private property lines and remain on designated trails at all times.

  • Maintain a respectful distance from free range cattle and allow plenty of space for them to pass.

  • Be mindful of rattlesnakes, especially on the grassy fringes of trails.

  • The Teller Farms - East Boulder Trail passes through rich bird watching habitat. Bald eagles, golden eagles, northern harriers, red tail hawks, prairie falcons, belted kingfishers and great blue herons are just a few that you may see at various times of year.

Camping and Backpacking Information

  • Teller Farm is a day-use only area.

Fishing Information

  • Fishing is permitted at Teller Lake with a valid Colorado state fishing license.

  • Smallmouth and largemouth bass must be 15 inches in length or longer.

Rules and Regulations

  • Dogs are permitted on the East Boulder Trail between the Teller Farms Trailhead - South and Valmont Road. All dogs must be leashed within 100 yards of Teller Lake. Dogs are not permitted north of Valmont Road in the White Rocks Nature Preserve. All dogs must be on a hand held leash unless they meet Voice and Sight Control Standards and display a City of Boulder Voice and Sight Tag.
  • .
  • Horses are permitted on the entire East Boulder Trail. Off trail riding is strongly discouraged. Bikes are permitted on the East Boulder Trail, though some sections require an alternative path off the main trail.

  • Portions of the Teller Farms - East Boulder Trail pass through the Lower Boulder Creek Conservation Area. You must have a permit to venture off-trail in this and any other Habitat Conservation Area (HCA).

  • There is no fee for a permit. Rangers will determine if a permit is required based on intended use and circumstances. Permits are valid only for the one day specified on the permit.

  • Contact Boulder Open Space and Mountain Parks (303.441.3440) or visit their website ( to apply for an off-trail travel permit.

Directions to Trailhead

The Teller Farms - South Trailhead is located .45 miles north of Arapaho Road in Boulder, Colorado. Travel 1 mile east of 75th Street on Arapaho Road to the Teller Farms Trailhead sign and turn left. The parking areas is located .45 miles north of the turnoff from Arapaho Road.

Contact Information

City of Boulder Open Space and Mountain Parks
Phone: 303-441-3440

Trip Reports

There are no trip reports on this trail.


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