Hiking in Boulder, Colorado
Boulder, Colorado has more than 150 miles of hiking trails across its Open Space and Mountain Parks system, ranging from flat creekside paths to steep foothill climbs, with the best-known including Mount Sanitas, Royal Arch, and the Chautauqua trails beneath the Flatirons.
Outdoor Boulder › Hiking in Boulder
The best hikes in Boulder at a glance
Every trail below links to its own guide with verified facts, parking, and dog rules. Start here, then dig into the one you want.
| Trail | Distance | Difficulty | Dogs | Why go |
|---|---|---|---|---|
| Boulder Reservoir | ~5 mi shoreline | Easy | Restricted May 15 to Labor Day; leash only otherwise | Flat lakeside walking, plus a summer swim beach and paddling. |
| Boulder Falls | Short walk | Easy (currently closed) | Leash | A quick roadside waterfall stop up Boulder Canyon. Closed for rockfall repairs. |
| Mount Sanitas | ~3.3 mi loop | Hard | Leash or Voice and Sight tag | A steep, stair-stepped climb to an open summit right above town. |
| Royal Arch Trail | ~3.4 mi round trip | Hard | Leash or Voice and Sight tag | A rocky climb from Chautauqua to a natural sandstone arch under the Flatirons. |
| Walker Ranch | 7.9 mi loop | Strenuous | Leash | A rugged foothills loop with a famous stone staircase, great for a big day. |
More Boulder trails (Chautauqua, Eldorado Canyon, the Mesa Trail, Betasso Preserve, and the Boulder Creek Path) are being added as their guides go live.
Easy hikes in Boulder
If you want flat, family-friendly, or short, start here. These are the low-effort options that still get you outside and near the water.
- Boulder Reservoir: Flat lakeside walking, plus a summer swim beach and paddling.
- Boulder Falls: A quick roadside waterfall stop up Boulder Canyon. Closed for rockfall repairs.
Moderate hikes in Boulder
Boulder's terrain tends to jump from flat valley floors straight to steep foothill climbs, so true "moderate" hikes are fewer than you'd think. The gentler halves of the harder trails work well here: the Sanitas Valley Trail along the valley floor (instead of the summit), or turning around partway up Royal Arch. More dedicated moderate routes, like the Chautauqua and Mesa trails, are being added.
Hard and steep hikes in Boulder
These are the climbs Boulder is known for: sustained uphill, rocky footing, and a real payoff at the top.
- Mount Sanitas: A steep, stair-stepped climb to an open summit right above town.
- Royal Arch Trail: A rocky climb from Chautauqua to a natural sandstone arch under the Flatirons.
- Walker Ranch: A rugged foothills loop with a famous stone staircase, great for a big day.
Best hikes for dogs
Boulder's OSMP trails are unusually dog-friendly: with a City of Boulder Voice and Sight tag, dogs can hike off-leash on many trails, including Mount Sanitas and Royal Arch, as long as they're truly under control and leashed at the trailhead. Boulder County trails like Walker Ranch are leash-only, and Boulder Reservoir bans dogs along the south shore from May 15 through Labor Day. Check each trail's guide before you bring the dog.
Best hikes for views and the Flatirons
For the classic Flatirons view, Royal Arch frames the city through a stone arch, and Mount Sanitas gives you a wide-open summit panorama for a shorter but steeper effort. Both are close to downtown.
Hiking in Boulder: what to know
Boulder sits at about 5,430 feet, and the trails climb from there, so the air is thin and the sun is strong. Carry more water than you think you'll need, wear real shoes for rocky footing, and pack a layer. Afternoon thunderstorms build fast in summer; start early and get off exposed ridges and summits before they roll in.
Parking and trailhead tips
Parking is the real hurdle at Boulder's most popular trailheads. Chautauqua (the start for Royal Arch) charges $2.50 per hour on summer weekends and holidays and fills very early; a free Park-to-Park shuttle runs from downtown on those days. Walker Ranch's lots fill fast too, with the Meyers Homestead Trailhead as the reliable backup. Boulder Reservoir charges a day-use entry fee from April through October. Come early, or come on a weekday.
Recommended nearby
[CLIENT SLOT: featured Boulder gear shop]
[One honest line: where to grab shoes, water, or layers before a hike.]
Sources
Trail counts and rules on this page are drawn from these authoritative sources: