South Teller Lake Trailhead
Always bring a face covering when you leave home and maintain 6 feet of distance
- You will need a face covering to visit Boulder’s open space trails and parks. Always bring one with you when you leave home.
- Place it over your nose and mouth when you can’t maintain 6 feet of distance from others.
- Wear it around your neck or wrist when no one else is around.
- Parents should help children older than 2 years old properly wear a face covering.
- Help protect vulnerable community members and each other.
Don’t forget: Keep the space in open space! Always stay at least 6 feet from others you don’t live with or haven’t agreed to have close contact with.
Please follow these other responsible recreation reminders:
- Visit OSMPTrails.org to see current trail closures, historical data that shows areas of high and low open space use and trails that are wider than 6 feet. See when trails are busiest through our Visitation Data Explorer.
- Protect first responders. Know your limits and don’t take unnecessary risks.
- Plan ahead and consider recreating closer to home as parking is extremely limited - especially on Flagstaff Mountain.
- Remember: Leave No Trace! Pick up trash and dog waste. Stay on trail and walk through mud. Step off if you need to maintain distance but quickly step back on trail.
- For more responsible recreation reminders, please visit the Covid-19 Recovery page.
On the north side of Arapahoe Road between 75th and 95th streets.
Please check for Trail & Area Closures.
You are responsible for knowing and complying with all closures and OSMP rules & regulations.
Ice on ponds and lakes
You can help to keep you and your pets safe by keeping them off OSMP's icy lakes. Many times, pets that fall into icy waters will be able to get out or self-rescue without assistance.
If it happens to you while visiting OSMP and your pet is unable to get out of the water, stay off the ice! Call 911 and Boulder Fire-Rescue will respond and rescue your pet!
Parking lot at the end of 0.5 mile dirt road north of Arapahoe Road.
Please keep your car doors locked and your car windows rolled up at all times while leaving your vehicle parked at OSMP trailheads. Also consider leaving important valuables at home or take them with you while visiting open space. To report suspicious activity please call City of Boulder Dispatch 303-441-3333 or Boulder County Dispatch 303-441-4444. For crimes in progress, call 911 immediately.
East Boulder Trail is sport chair accessible and meanders to the north past Teller Lake and through farmland utilized for crop production, cattle and horse grazing and bee keeping on its way to the North Teller Trailhead. Northward, from the northwest corner of North Teller Trailhead, the trail extends west along Valmont Road for approximately 1/4 mile. Here it turns north crossing Valmont Road and enters the White Rocks Nature Preserve (**Please note that all visitors must stay on trail in the White Rocks Nature Preserve as the property is private land for which Boulder holds a conservation easement.) This trail is sport chair accessible from Valmont Road northward to Boulder Creek. This trail may be taken to the White Rocks Trailhead on 95th Street or to the Gunbarrel Farm Trailhead at the intersection of Boulderado and Cambridge Streets in the Heatherwood neighborhood.
An RTD bus passes very close to this trailhead. Learn about Taking the Bus to OSMP.
Located at the trailhead.
Picnic tables at the trailhead and parking area. Grills and stoves are prohibited.
Visit the Fishing webpage for more information about fishing opportunities and regulations.
Fishing line and trash can kill wildlife. Please pick up all plastic trash you find! Discarded fishing line is especially dangerous to wildlife. Animals may eat or become entangled in litter, causing them to drown or starve to death.
This area is identified as being popular with people using wheelchairs. See the Accessible Trails Page for details.
Bicycles are allowed throughout the length of the East Boulder Trail. A bicycle rack is available at both the north and south trailheads of Teller Farm. Bicycles may be ridden only on those trails that are posted with the international bicycle symbol. Other bike trails on OSMP.
Learn about bringing your dog to OSMP. Dogs are not allowed at Teller No. 5 and must be leashed within 100 yards of the water at Teller Lake South.
Dogs are not permitted north of Valmont Road in the White Rocks Nature Preserve. All dogs must be leashed in the Trailhead Leash Area. Beyond the trailhead, dogs must be on a hand-held leash at all times east of the parking lot unless they meet the voice and sight control standard and display a City of Boulder Voice and Sight tag. Dog excrement removal is required by law.
Allowed on most trails. Off-trail riding is discouraged to protect rare plants and wildlife habitat. Learn more about riding your horse on OSMP.
There is a variety of waterfowl and fish at Teller Lake. Grass carp were introduced into the lake to control the growth of pond vegetation. State fishing regulations apply. All smallmouth and largemouth bass in possession must be 15 inches in length or longer. Raptors, coyote, fox and deer may also be observed in this area.
- Teller Farm is a historic and presently working farm. Irrigation and farming practices have changed since Open Space acquired the land.