Best trail running routes in Boulder

Boulder is a running town, and the reason is geography: you can start a flat tempo run from downtown, and twenty minutes later be climbing 1,300 feet in a mile. That range is the whole point. The routes below are sorted by the kind of effort they suit rather than by scenery, because that's how runners actually choose. Each one links to its own guide with parking, permits, dog rules, and current closures. For everything else on foot, start at the Boulder hiking hub.

Flat and fast: tempo, long steady, and recovery runs

These are the routes where you can hold a pace without picking your way over rock. They're low, close to town, and mostly runnable in every season the tread isn't muddy.

• Boulder Creek Path: About 5.5 miles one way, essentially flat, running east-west through the middle of town beside the creek. Surface: Paved concrete and asphalt. The default tempo and recovery run in Boulder. It's free, open year-round, lit by daylight at both ends of the day, and you can start from almost anywhere in town. It's a multi-use path with a 15 mph speed limit, so expect bikes and commuters and run predictably.
• South Boulder Creek Trail: 3.40 miles with 248 feet of gain, so it runs flat compared with anything in the foothills. Surface: Wide dirt, with a cement stretch between the Bobolink Trailhead and the East Boulder Community Center. The best out-and-back in town for holding an even pace. Parking at Bobolink is free. Dogs aren't allowed south of the gate where the trail follows the stream south of South Boulder Road, and from mid-May through summer there are ground-nesting bobolinks in the field east of the trail, so stay on tread.
• Community Ditch Trail: OSMP's trail data lists 3.90 miles (its written description says 3.5) with 393 feet of gain, so it's gently rolling rather than dead flat. Surface: Wide dirt doubletrack, 6+ feet across. A ditch-bank line between Marshall Mesa and Doudy Draw that lets you run long without thinking about footing. It links into Marshall Mesa and Flatirons Vista for a bigger day. Shared with bikes and horses, and both trailheads charge an OSMP parking permit.
• Teller Farm and the East Boulder Trail: Flat farmland running on mild grades. OSMP doesn't publish an official mileage for these segments, so we don't quote one. Surface: Groomed dirt farm trail. The mud-season and winter fallback. It's open farmland with almost no tree cover, which makes summer afternoons hot but keeps it dry and runnable when the foothills are sloppy. Dogs are not permitted north of Valmont Road in the White Rocks Nature Preserve, and everyone has to stay on the trail there.
• Boulder Valley Ranch: Wide, rolling grassland trails with short climbs rather than steep ones. Surface: Smooth dirt doubletrack on Sage and Eagle. Free parking, big Front Range views, and mellow tread that suits a steady effort. It's almost entirely shadeless, so it's a morning or evening run in summer. This is working ranch land, so close gates behind you and give cattle a wide berth.

Rolling: honest hills without a summit day

Rolling terrain, short climbs, and good footing. This is the middle ground between the creek paths and the peaks, and it's where most Boulder runners spend their ordinary weeks.

• Marshall Mesa: A 2.7-mile loop linking the Marshall Valley, Marshall Mesa, and Coal Seam trails, with mild gain and a few short rocky, stepped sections. Surface: Dirt singletrack and doubletrack, rockier on Coal Seam past the Davidson bridge. The most reliable rolling run near town. The open, sunny mesa dries faster than the shaded foothill trails, which makes it a strong winter and shoulder-season pick. The trailhead reopened in March 2026 and parking needs an OSMP permit.
• Flatirons Vista: A gentle rolling loop through meadow and open ponderosa. OSMP publishes no official loop mileage or gain figure, so plan by time rather than distance. Surface: Easy doubletrack on the north side, rockier through the pines on the western part of the south trail. Quiet, runnable, and one of the better cool-season options in town thanks to the gentle grades. Connectors run on to Doudy Draw and the Spring Brook Loop when you want more. A seasonal leash rule applies on the upper Doudy Draw section west of the trailhead because of bear activity.
• Sanitas Valley Trail: About 1.25 miles one way, roughly 2.5 miles round trip, rising about 575 feet across its full length (COTREX puts the range at 5,495 to 6,070 feet). Surface: Wide, smooth gravel with easy footing. The classic Boulder hill-effort trail that doesn't wreck you. It's the gentle valley floor beside Mount Sanitas, wide enough to run side by side, free to park at the Centennial Trailhead, and low and sun-exposed enough to stay runnable through most of winter. The lot fills early on weekend mornings.
• Wonderland Lake: A short, nearly flat loop around the lake in north Boulder, with a connection up to the Foothills Trail when you want to add rolling terrain. The City doesn't publish an official loop distance. Surface: Smooth, mobility-friendly dirt path. A good warm-up, cool-down, or easy-day loop that you can extend uphill. Parking is free but the lot is small, and the SKIP bus stops on Broadway right by the trailhead. One rule catches runners out: dogs must be on a hand-held leash at all times here, because the Voice and Sight tag does not apply at Wonderland Lake.

Big vert: the hard efforts

Steep, rocky, and sustained. Nearly everyone power-hikes the steepest sections of these, and that's normal here rather than a failure of fitness. Plan on much slower splits than the distances suggest.

• Mount Sanitas: 1,323 feet of gain in 1.3 miles to the summit, about 3.3 miles round trip for the standard loop. Surface: Steep, rocky, stair-stepped trail. Expect to power-hike the steep bits. The shortest way in Boulder to get a genuinely hard hill effort, which is why it's a local benchmark. Free parking at the Centennial Trailhead, minutes from downtown. The west-facing rock holds sun and heat, so go early.
• Green Mountain: An 8,144-foot summit. About 5.5 miles round trip and roughly 2,300 feet from Gregory Canyon, or about 2.6 miles and roughly 600 feet by the West Ridge from Flagstaff Road. Surface: Rocky foothill trail, steeper and more stepped on the Gregory Canyon and Saddle Rock lines. Two very different runs from one summit: a real climbing effort from the bottom, or a short, moderate high-country loop if you drive up Flagstaff. There's a bronze peak finder and big Continental Divide views up top. Note that dogs are not permitted on the upper E.M. Greenman section leading to the summit.
• Bear Peak: An 8,461-foot summit, Boulder's second tallest. Roughly 4.7 miles round trip via Cragmoor and Fern Canyon, about 8.1 miles for the classic NCAR loop, with most approaches climbing about 2,800 to 3,000 feet. Surface: Rocky, sustained trail with a short rock scramble at the summit marker. The big local summit day. Free parking at the NCAR and Cragmoor trailheads, 360-degree views, and enough length to make it a genuine long run. Fern Canyon gets icy October through March, so carry traction.
• Fern Canyon: Roughly 1,700 feet of climbing on the Fern Canyon Trail alone, reached by way of the Mesa Trail from NCAR or Cragmoor. Surface: Steep, rocky, loose near the top. This is a hiking-pace climb for almost everyone. OSMP calls it arguably the most strenuous trail in its system, which tells you what you're signing up for. It's the vert workout runners use when they want to suffer on purpose. There's no trailhead named Fern Canyon; you connect to it from the Mesa Trail.
• Shadow Canyon: A long out-and-back to the saddle between Bear Peak and South Boulder Peak, Boulder's highest summit at 8,549 feet. OSMP publishes no official round-trip mileage or gain, so plan for a full day. Surface: Steep and rocky, stair-stepping through boulders with loose footing. The summits need some scrambling. The hardest of the standard local efforts, approached from the South Mesa Trailhead by linking the Mesa Trail with the Shadow Canyon spur. Start at dawn in summer to be off the high ground before storms build. The paid lot fills early and roadside parking on Highway 170 is not allowed.

The Mesa Trail: Boulder's classic long point-to-point

If you want one long run that shows you the whole front range of the city, it's the Mesa Trail. It runs roughly 6 to 7 miles one way along the base of the Flatirons between Chautauqua in the north and Eldorado Springs in the south, and it's long, rolling, and hilly rather than a climb. You can join it partway from the NCAR trailhead, where parking is free, or run it end to end from Chautauqua Park to the South Mesa Trailhead if you can arrange a car at the far end. On summer and fall weekends and holidays the City's free Eldo shuttle serves the South Mesa trailhead, which can solve the logistics, though it only runs in season, so check the current schedule. It's also the connector that feeds Fern Canyon and Shadow Canyon, so it doubles as the approach for the summit days.

Altitude, and why your pace is slower here

Boulder sits above 5,000 feet and the trails climb from there. Bear Peak tops out at 8,461 feet and South Boulder Peak at 8,549 feet, so a summit run puts you 3,000 feet or more above town. If you've flown in, run your first few days by feel instead of by pace, drink more than you think you need, and save the vert for later in the trip. More on adjusting is in our Boulder altitude guide.

Afternoon storms in summer

From roughly late spring through summer, thunderstorms build over the foothills in the afternoon, and the summits are exposed. The local habit is simple: start early and be off the high ground before the sky changes. Our guides for Shadow Canyon and Bear Peak both say the same thing, and it's the single most important timing rule for running here. The details, including what to do if you get caught out, are in the Boulder thunderstorm guide.

Running with a dog

The default on City of Boulder Open Space and Mountain Parks land is a hand-held leash. Dogs can be off leash only when they're under voice and sight control and wearing a City of Boulder Voice and Sight tag, and you're expected to leash up in the trailhead area either way. Then there are the exceptions that catch runners out: dogs must be leashed at all times at Wonderland Lake because the tag doesn't apply there, dogs aren't permitted on the upper E.M. Greenman section to the Green Mountain summit, they're not allowed south of the gate on the South Boulder Creek Trail, and they're prohibited north of Valmont Road in the White Rocks Nature Preserve at Teller Farm. On NCAR's federal property everything stays leashed. Full rules are in our guide to hiking and running with dogs in Boulder.

Mud closures, and where to run instead

OSMP closes trails when conditions are too muddy, and running a soft trail anyway is how ruts get made. Check the muddy trail closures page before you drive out after rain or snowmelt. When the foothills are shut or sloppy, the dry-fast options are the open, sunny, low ones: Marshall Mesa, Teller Farm, Boulder Valley Ranch, and the paved Boulder Creek Path, which never closes for mud. For seasonal timing, see when to visit Boulder, and for winter footing, our winter trails roundup.

Parking, permits, and early starts

Some Boulder trailheads are free and some need an OSMP parking permit, and the good lots fill early on weekend mornings. Centennial (for Mount Sanitas and the Sanitas Valley Trail), NCAR, Bobolink, and Boulder Valley Ranch are free. Marshall Mesa, Doudy Draw, Flatirons Vista, Gregory Canyon, and South Mesa are paid lots. An early start solves both problems at once: you get a space, and you beat the heat and the storms. Details are in our Boulder trailhead parking guide, and if you don't have a car, see trailheads you can reach without a car.

Trail running in Boulder: FAQ

More Boulder roundups

• Best easy hikes in Boulder
• Best hard hikes in Boulder
• Best views in Boulder
• Best dog-friendly hikes in Boulder
• Best winter hikes in Boulder
• Best mountain biking near Boulder

Sources

Distances, elevation figures, dog rules, and closure policies on this page come from these authoritative sources and the destination guides they link to:

• City of Boulder: Open Space & Mountain Parks (trail data and difficulty ratings)
• City of Boulder: Dogs on OSMP (leash rules and trail-by-trail dog map)
• City of Boulder: Voice and Sight Tag Program
• City of Boulder: Muddy trail closures
• City of Boulder: OSMP parking permits and fees