Dog Parks

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Parks, Open Space and Trails


Dog Parks are open 1 hour before sunrise and 1 hour after sunset, seven days a week, except as otherwise posted.


  • Dogs must be licensed and vaccinated.
  • No puppies under 4 months are allowed (because of risk of parvovirus)
  • Please keep your dog on leash until you are inside the park and keep your leash on hand. Close the gate behind you.
  • The limit is 3 dogs per person, per visit.
  • Dogs may not be left unattended.
  • If there are other dogs in the park, please keep your dog on leash until you are sure they are compatible.
  • Dogs in heat are prohibited. It is recommended that dogs be spayed or neutered.
  • No aggressive dogs allowed. If any person or dog is bitten by a dog at the park, report it to the Longmont Police Department Animal Control Office, (303) 651-8501.
  • Dog owners must be responsible. By removing your dog's leash, you are guaranteeing to other park users that your dog is safe.
  • Please pick up after your dog. The success of the dog parks depends on owners taking responsibility for their dogs.
  • Young children must be supervised by a responsible adult.

Dog Park Courtesies

  • Help keep the area clean and odor free.
  • Keep the dogs on the sidewalk while traveling to and from the dog park.
  • Keep dogs off of private property.
  • Encourage other users to clean up after their pets at all times.

Note: parks may be closed during the year to allow the grass to re-establish.

Please park in designated lots.

List of Longmont Dog Parks

  • Union Reservoir Nature Area

    Union Reservoir Park
    1. Address:461 County Road 26
      Longmont, CO 80504
    1. BBQ Grill or Pit(s)
    2. Boat Storage
    3. Boating (wakeless)
    4. Dog Beach
    5. Fishing (all ages)
    6. Fishing Pier
    7. Paddleboarding
    8. Parking Lot(s)
    9. Picnic Area(s)
    10. Playground(s)
    11. Restroom(s)
    12. Scout Circle
    13. Shelter(s)
    14. Swim Beach
    15. Volleyball Court(s) - Sand
    1. Parks
    2. Rental Space

Nature Area Hours: 1 Hour Before Sunrise to 1 Hour After Sunset 

Union Reservoir is a 736 acre body of water providing many outdoor recreational activities. Originally called Calkins Lake, the reservoir was carved out during the last glacial age and is one of only a few natural lakes in Colorado. In 1903, the Union Ditch Company began drilling a tunnel to release water into the St. Vrain Creek. According to Colorado water law, that made Union a true reservoir.

The reservoir is located approximately 7 miles west of I-25.

Get the full scoop on activities - including wakeless boating, dog beach, swim beach and fishing - on the Union Reservoir webpage. There, you can also find information on hours and fees, as well as day-use shelter reservations.

Beginning in 2018, there will be no more overnight camping at Union Reservoir. Areas previously used for campsites will be reconfigured to provide additional day use opportunities and parking during peak periods. These changes will produce useful benefits for a larger number of patrons to enjoy. In the long-range future, design and construction of a modern campground with both tent and RV camping is planned. Learn more on the Union Reservoir Recreation and Trail Master Plan webpage. In the meantime, alternative local and regional camping opportunities can be found at

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