Muddy Trail Closures
Muddy Text Alerts
Text “OSMP” to 888-777 to sign up for text updates about muddy trail closures.
Other Trail Closures and Advisories
East Boulder Teller Lake trail segment closed July 21-24 and Aug. 4-6
The small segment of East Boulder Teller Lake Trail that goes east from the Teller Lake North Trailhead to Teller Lake #5 will be closed Monday - Thursday, July 21-24 and Monday - Wednesday, Aug. 4-6. The closure is needed for tree work using heavy equipment that will help with invasive species removal, fire mitigation, dam safety and water conveyance. The closure does not affect the main East Boulder Teller Lake trail between the north and south trailheads.
Mount Sanitas Trail Project
The city has begun a multi-year effort to improve trails and restore sensitive natural areas on Mount Sanitas. Work in 2025 will focus on summit approach repairs, bouldering area enhancements and closing redundant social trails. No full trail closures are expected, but intermittent delays may occur. Learn more about the Mount Sanitas Trail Project.
Chapman Drive Trailhead and Boulder Canyon Trail closures beginning March 3
OSMP closed a recently constructed underpass that connects the Boulder Canyon Trail to the Chapman Drive Trailhead for approximately three months to install a new bridge, weather permitting. A closure at the Chapman Drive Trailhead to complete trailhead improvements is expected to extend further in the summer. View a map of the closure area below. The Chapman Drive Trail and the existing vehicle bridge from the highway and Chapman Drive Trail to the west will remain open throughout the project. Boulder Canyon Trail – except for the underpass near Chapman Drive Trailhead, which will be closed this spring to install a new bridge – also will remain open. View a map.
Sawhill Ponds Trailhead closure beginning March 3
The Sawhill Ponds Trailhead will be closed March 3 through the end of 2025, weather permitting, while OSMP completes major trailhead improvements. Visitors can access the Sawhill Ponds Trail during the trailhead closure through the Walden Ponds Wildlife Habitat trailhead and the Walden Ponds Trail to the north. Walden Ponds is managed by Boulder County Parks & Open Space and subject to county regulations. View more on the Sawhill Ponds Trailhead Project page.
Boulder Falls Trail closed effective November 12
The Boulder Falls area in Boulder Canyon is temporarily closed after a rockslide damaged the trail and infrastructure that keeps rocks and sediment from falling on the trail. There is no estimated timeline for when the area may reopen and more information will be provided once an assessment is completed. Climbers who access Dream Canyon through Boulder Falls should take alternate routes, such as Sugarloaf Road.
Marshall Mesa Trailhead closure
OSMP closed the Marshall Mesa Trailhead to support state coal mine mitigation work and conduct extensive trailhead improvements. The trailhead will likely be closed for one year. During the Marshall Mesa trailhead closure, visitors can access most of the Marshall Mesa trails. Bicyclists also will be able to complete the full "Dirty Bismark" loop. View maps and learn more on the project page.
Boulder Star Area closure
The City of Boulder reminds everyone to view the Boulder Star from afar as it remains closed. No designated trail currently leads to the Boulder Star. Learn more about viewing the Boulder Star from afar.
Creek closures to limit spread of invasive mudsnails
The City of Boulder has closed access to South Boulder Creek at the South Mesa Trailhead to prevent the spread of a highly invasive aquatic species, New Zealand Mudsnails (NZMS). The South Mesa Trailhead and the Mesa Trail will remain open. Learn more about the NZMS closures.