Upslope Brewing Company – Flatiron Park
1898 S Flatiron Ct, Boulder, CO 80301
Well-behaved, supervised dogs on a leash are welcome on the Flatiron Park patios; dogs are no longer allowed inside because of health department rules.
- patio
Mount Sanitas & Sanitas Valley Loop
Dog-friendly hike near Boulder · Centennial Trailhead, 301 Sunshine Canyon Dr, Boulder
Illustration of the region, not this trail.
Dogs on this trail
Mount Sanitas and Sanitas Valley trails require a leash south of the Sanitas Spur and allow Voice and Sight control (tag required) north of it; the adjoining Lion's Lair Trail is closed to dogs.
Source: City of Boulder Open Space & Mountain Parks · checked 2026-10-24. Rules change; confirm before you go.
- Distance3.5 mi
- Elevation gain1351 ft
- Leash ruleVoice & Sight tag or leash (no dogs on Lion's Lair)
- Water on trailNone — carry water
- SeasonYear-round; the ridge sheds snow fast, the valley can be muddy
- Parking31-space Centennial lot fills before 7 a.m. on weekends; limited street parking on Mapleton Ave
- FeeFree
- RestroomsRestroom at the Centennial Trailhead
- Managed byCity of Boulder Open Space & Mountain Parks
The Sanitas loop is Boulder's stair-master: a steep, rocky 1.25-mile ridge climb with 1,300 feet of gain, then a gentle return down the wide Sanitas Valley road. It is one of the most dog-dense trails in the state, which cuts both ways. Tagged Voice & Sight dogs can be off leash on most of the loop, but the neighborhood ends require a leash, and the newer Lion's Lair route up the north side is strictly no dogs. There is no water and little shade on the ridge; carry plenty in summer. Rattlesnakes sun on the lower rocks. Best for fit, sure-footed dogs that already have reliable recall around other dogs.
Need a sitter while you summit?
Independent Boulder boarders and daycares can send free quotes. One short form, no obligation.
Dog boarding in Boulder Daycare in BoulderAfter the hike
Avery Brewing Company
4910 Nautilus Ct, Boulder, CO 80301
Avery describes its outdoor beer garden and patio as dog-friendly; dogs stay outside while you drink and dine.
- patio
More trails near Boulder
- Chautauqua Trail and Royal ArchBoulderVoice & Sight tag or leash · 0.7 mi
- Marshall Mesa LoopBoulderVoice & Sight tag or leash · 2.7 mi
- Doudy Draw to Flatirons VistaBoulderVoice & Sight tag or leash; seasonal leash Aug. 15–Dec. 1 · 2.2 mi
- Betasso Preserve Canyon LoopBoulderLeash required · 3.3 mi