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Planned Burns

Wildland firefighters working prescribed burns

The City of Boulder conducts prescribed burns to improve the health of city open space ecosystems and to reduce the fire danger for Boulder residents. 

Currently Planned Prescribed Burns

The City of Boulder’s Open Space and Mountain Parks and Fire-Rescue departments are planning to conduct prescribed burning on city open space lands west of the city’s Flatirons Vista Trailhead this fall. This prescribed burning south of Boulder could occur between Tuesday, Oct. 1, and Saturday, Nov. 30, depending on weather conditions.

Fire is an important part of Boulder’s native ecosystems and is essential for cycling nutrients, keeping weeds in check and stimulating the growth of native plant species. Prescribed burning in grassland ecosystems west of the Flatirons Vista Trailhead will help enhance habitat for native plant and wildlife species, improve forage for ranching operations in the area and reduce fuels that would otherwise increase fire intensity in the event of a wildfire. The prescribed burn also will provide city wildland firefighters, OSMP staff and cooperating agencies with wildfire training opportunities.

OSMP may close all or portions of the following trails while this burning occurs:

  • Greenbelt Connector
  • Prairie Vista
  • Flatirons Vista North
  • Flatirons Vista South

Ignitions will begin after 10 a.m., and will end before 4 p.m. Community members, open space visitors and motorists along state Highway 93 and U.S. Highway 36 will see smoke from this planned burn. Open space visitors may also see residual smoke after this burn has been completed. OSMP encourages community members to access to plan alternate open space destinations should burning occur.

The City of Boulder only conducts prescribed burning if, and when, weather and vegetation conditions are acceptable to assure the safety of the public, to minimize the potential impacts of smoke and to meet fire-management objectives. Boulder Fire-Rescue will supervise the planned burn, and firefighters will monitor the burn until it is safely extinguished. Prescribed fire smoke may affect your health. Learn more at:

Notifications and Updates

The City of Boulder seeks to inform the public about planned burns in advance of any ignitions through social media updates through the city’s Facebook, Twitter and NextDoor accounts and a press release to local media. A banner on top of will also appear when the city is conducting burns.

If the city is planning burns along the mountain backdrop, the City of Boulder will work with CDOT to include messaging about planned burns on message boards along U.S. Highway 36 and Highway 93. Additional notifications include signs along open space access points and trail junctions, and signs in nearby neighborhoods.


Every prescribed burn goes through an extensive planning process to consider ecological goals, the resources required, potential fire and smoke behavior, crew logistics, and desired weather and fuel moisture conditions. In advance of burns, firefighting staff can use a variety of techniques for controlling the burn. Mowing of fuels, extensive hose lays, wetting down burn boundaries, or burning off small areas of fuel are all tools used to create holding lines around a burn unit. When planning burns, City of Boulder staff take every precaution to ensure that there are either natural or man-made features that serve as “fire breaks,” which help control prescribed burns.


Boulder Fire-Rescue firefighters monitor prescribed burning at all times until the burns are safely extinguished. For larger burns, Boulder Fire-Rescue calls in firefighters from local, state and federal agencies to help manage and extinguish prescribed burns.

Conditions and Weather

Prescribed burning is only carried out if and when weather and vegetation conditions are acceptable to assure the safety of the public and minimize the potential impacts of smoke. Weather is an important driving factor in prescribed burning and can dramatically influence the success of a burn. In some cases, prep work is completed but the burn may be called off because the proper weather or fuel conditions can’t be met.


Depending on the fire’s location and its size, OSMP may close trails during prescribed burns. For trail closure information during a prescribed burn, please visit or come back to this site.


Prescribed fire smoke may affect your health. For more information, please visit the Colorado Department of Public Health and Environment. Residents will see smoke from small and large burns. Residual smoke may be seen after burns are completed. Firefighters will remain on scene until all burns are completely extinguished. Young children – especially those under 7 years - older residents, those who have pre-existing respiratory or circulatory conditions and pregnant women may be affected by smoke. To avoid smoke, please close windows and stay indoors.

Frequently Asked Questions

Why conduct prescribed burns?
Historically fire played a significant role in maintaining the ecological health of our forests and prairies. Low elevation ponderosa pine forests and grasslands burned as frequently as every 5 to 30 years. But with the growing population and urbanization of the West, fire suppression has become the norm. That has allowed forests to become denser and vegetation to grow rampantly, creating larger fire risks for some communities, while also stunting important ecological processes.

Today, scientists have decades of research citing fire as an essential element to maintain forest health and to protect our native species. By introducing prescribed fires, the City of Boulder can restore the natural balance for Colorado’s fire-adapted ecosystems and reduce the amount of fuel in the forest during a wildfire.

Why does fire help restore important ecological processes to forests and other areas?
In our agricultural operations, fire is an essential tool for maintaining irrigation ditches and ensuring water flows throughout the system. It also can be used to clear fields, control weeds and improve forage for grazing. Low-intensity burns in grasslands and forests remove dead vegetation and needles that can quickly accumulate. A build-up of dead material can inhibit the growth of native plants and decrease the habitat value for wildlife. Burning cycles nutrients back into the soil, and results in more dense and diverse native vegetation.

Regular burning can also remove small trees that create competition for larger, mature trees in a forest. By managing forest density through fire, the remaining trees are healthier and more resistant to high-intensity wildfires and forest insects like Mountain Pine Beetle.

How does OSMP choose areas where it will use prescribed burns?
Burn selection is always a balance between risk and benefit. Can we effectively burn an area to meet the ecological goals while minimizing the risk and impacts to surrounding neighbors and resources? The highest priority is public safety. Considerations such as fuel type, topography and the ability to maintain perimeter lines are critical in evaluating potential prescribed burn locations.

It’s also essential to consider the ecological benefits. Every managed area has a list of ecological goals we hope to meet through burning. We also consider the strategic benefit of a prescribed burn on the landscape. With any prescribed fire, one of the end results is a decrease in fuel load, and in certain areas, this can create a fuel break to protect nearby homes and private property.

The city’s Forest Ecosystem Management Plan and Grassland Ecosystem Management Plan – which lay out how OSMP will accomplish its ecological responsibilities mandated by the department’s charter – identify prescribed fire as an important management tool and a high-priority conservation strategy.