Rules & Regulations

Parks & Open Space Rules & Regulations

Rules and regulations are important tools in place for the protection of wildlife, the natural environment and all users of County Parks and Open Space. Rules and regulations may vary depending on the property. Users are responsible for knowing and obeying all rules and regulations. Violations are punishable by fines of up to $300.

Emergency Phone Numbers

  • 911 for an emergency or any situation requiring immediate attention.
  • Text-to-9-1-1 for an emergency when voice connectivity is unavailable, but texts can be sent. Learn More.
  • 303-441-4444 to contact a park ranger or report unlawful activity

Frequently Addressed Regulations

Dogs & Pets

  • With the exception of Hall Ranch, Heil Valley Ranch, Caribou Ranch and Dodd Lake, dogs are allowed.
  • All pets must be on a leash and under the physical control of its owner or guardian at all times.
  • Dogs are allowed off-leash only at Reynolds Ranch and the West Twin Lakes Trail. Any owner/guardian accompanying a dog in an off-leash area must have the ability to restrain his or her dog when requested by staff.
  • It is unlawful to confine any animal in a motor vehicle in such a manner that places it in a life or health threatening situation by exposure to a prolonged period of extreme heat or cold.


  • Smoking is prohibited within any County Parks and Open Space areas.
  • It is unlawful to consume marijuana or any marijuana derivative within any County Parks and Open Space area.


  • County Parks and Open Space areas are open from sunrise to sunset.
  • Regional trails (Longmont-to-Boulder LoBo Trail, Coalton Trail, Coal Creek Trail, Rock Creek Trail, Meadowlark Trail, and Mayhoffer-Singletree Trail) and regional trail connectors are open to commuters 24 hours per day.


  • A valid Colorado fishing license is required for all persons 16 years of age or older whenever fishing in ponds, lakes, creeks and rivers.
  • Ice fishing is prohibited.
  • See Fishing on Open Space for more information.


  • Boating is allowed at Lagerman Reservoir and Pella Crossing.
  • Watercraft must be in compliance with all state laws.
  • See the Boating Section for more information.


  • Swimming and wading are prohibited.


  • Camping is prohibited in all County Parks and Open Space areas.


  • County Parks and Open Space areas are open from sunrise to sunset. Unattended vehicles left after dark will be ticketed and/or towed.
  • Vehicles must be parked in designated areas only.
  • Unauthorized motorized vehicles are prohibited beyond parking lots.


  • Mountain biking is allowed on officially designated trails. Bicycle riders must yield the right-of-way to other trail users.
  • Downhill riders must yield to uphill riders.


  • Horseback riding is allowed.
  • Equestrians are strongly encouraged to stay on designated trails.
  • Horses must be on a lead and may not be tied and left unattended.
  • All feed provided to livestock while on trails and trailheads must be free of weeds and weed seeds.


  • Do not feed, disturb, molest, or kill wildlife.
  • Hunting and trapping are prohibited.
  • Relocating or releasing animals onto County Parks and Open Space properties is prohibited.


  • Discharging or carrying firearms (concealed or otherwise), crossbows, fireworks, explosives or projectile weapons of any kind are prohibited except as expressly mandated by Article 12 of Title 18 of the Colorado Revised Statutes, as amended.

Resource Protection

  • Do not collect, remove, destroy or deface any natural or manmade object including trees, down timber, branches, shrubbery, plants, flowers, antlers, fences, signs, kiosks, restrooms, cultural resources or shelters.
  • Do not install or replace rock bolts, plant trees or other landscaping, or construct trails or other structures.
  • The collection of deer and/or elk antler sheds and the creation of antler traps is prohibited.


  • State law prohibits the possession or consumption of any beverage having alcohol content greater than 3.2% in any public place.


  • Do not build camp fires or collect firewood. Charcoal fires are allowed in grills provided at picnic shelters and picnic areas.


  • Unmanned aircraft systems, also known as drones, are prohibited.
    • Boulder County allows limited use of unmanned aircraft systems for scientific research, operational monitoring, and agricultural uses on open space. Learn more.

Special Use Permits & Commercial Activity

  • Special Use Permits are required for all groups larger than 25 people.
  • Races, events, filming movies, equipment demonstrations, and other commercial activity are prohibited.
    • Individuals engaging in still camera photography are exempt as are nonprofit tax exempt entities.
  • Posting advertisements or brochures on County Parks and Open Space, in the parking lot, or on vehicles is prohibited.

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