Yellow-bellied marmot
Marmota flaviventris
MorningMiddayAfternoon
Photo: USFWS — public domain
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Boulder · Hard
South Boulder Peak
Boulder OSMP's highest summit at 8,549 ft — 6.8 mi RT via Shadow Canyon
Boulder Open Space & Mountain Parks
Distance6.8mi round trip
Elevation2,950ft gain
High point8,549ft summit
Typical time3.5–6hours
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Boulder OSMP's highest summit at 8,549 ft — 6.8 mi RT via Shadow Canyon. Editorial intro forthcoming.
Trip facts
Typical duration3.5–6hours
Trailhead5,760ft elevation
High point8,549ft summit
Dogs: leashes required.
How you'll find it
From Chautauqua Park, take Mesa Trail south approximately 2.5 miles to Shadow Canyon Trail, then follow to South Boulder Peak summit.
Drive time
Personalize with your ZIP
We'll calculate drive time + a leave-by recommendation to beat the lot fill.
What you'll get
- 8,549ft — highest summit in Boulder Open Space
- Quieter than Bear Peak despite similar difficulty and views
- Combines naturally with Bear Peak for a full ridge traverse day
- Views extend to Indian Peaks Wilderness and James Peak
What locals know
Practical-craft notes for this specific trail — timing, route, photo, etiquette.
Trail tips
- Timing
Add 30min to whatever Bear Peak takes
South Boulder Peak's quieter approach via Mesa Trail + Shadow Canyon is 1.3 miles longer than Bear Peak — bake that into your turn-around math. If Bear Peak fits in your day window, S Boulder might not.
- Route
Shadow Canyon is the right turn-off
From Mesa Trail south, watch for the unmarked Shadow Canyon junction at 2.5mi. The unsigned spur to the left looks like the trail; it's not. Shadow Canyon is the steeper right-hand option that climbs.
- Gear
Pair with Bear Peak for the ridge traverse
Most South Boulder Peak hikers combine it with Bear Peak via the connecting ridge — adds ~1.5mi but gives you both 8,000ft+ summits in one day. Bring lunch + extra water for the longer day.
- Photo
Quieter summit, same view
Same Indian Peaks horizon as Bear Peak but ~80% fewer people. The summit boulder field photographs well with a wide-angle lens; bring something at 16–24mm equivalent.
- Weather
Shadow Canyon is shaded — but exposes you up high
The canyon approach stays cool in summer mornings (rare for OSMP). Above treeline, you're exposed on the bare summit ridge — afternoon lightning is the real risk.
Where you'll start
South Boulder Peak is Boulder Open Space's biggest day — 6.8 miles and 2,950ft from the Chautauqua trailhead, which fills by 6am on summer weekends. The Mesa Trail approach is quieter than other Chautauqua-adjacent peaks, but you still share the parking situation. Use the shuttle or arrive at dawn; no overnight stays.
Parking cost
Free
Overnight
Not allowed
Boulder OSMP closes Chautauqua Park lots at sunset — overnight parking not permitted.
Park entrance
Free
Restrooms
Flush toilets
Fills by
6am–7am May–October — extremely competitive
Cell service
Reliable
What's at the trailhead
- Restrooms — Flush toilets
- Water spigot
- Information kiosk
- Reliable cell service
If the lot is full
Free Chautauqua Express shuttle from downtown Boulder Transit Center, Saturdays & Sundays May–October.
Alternative access
- Chautauqua Express shuttle from downtown Boulder (free, weekends May–Oct)
- RTD HOP bus stops at 9th & Baseline
Vehicle security
Moderate break-in risk reported — stash valuables out of sight before arriving.
When to go
Highlighted months offer the best conditions.
Who shares the trail
Boulder's highest open-space summit (8,549ft) hosts the same alpine accents as Bear Peak's ridge — marmots on the summit talus, golden eagles riding thermals, and a quieter approach where you may see more deer along the Mesa Trail than other Chautauqua peaks.
- Occasional
CommonMule deer
Odocoileus hemionus
Year-roundDawnDuskQuieter approach via Mesa Trail puts you in better deer-viewing territory than the busier Chautauqua-meadow trails.
Photo: NPS Photo — public domain
OccasionalGolden eagle
Aquila chrysaetos
Year-roundSoaring the summit thermals year-round. The highest Flatirons summits are golden-eagle territory.
Photo: USFWS — public domain
OccasionalBlack bear
Ursus americanus
DawnDuskPhoto: USFWS — public domain
What to watch for
What to watch for
- Rocky summit requires scrambling for final 200ft
- Less-traveled trail — bring navigation backup
- Lightning exposure above treeline
- Long approach makes this a full-day commitment
On the map
Overnight camping
Day-use only — overnight not permitted
Boulder OSMP closes lots at sunset; no camping on Boulder Open Space land.
Trail-tested picks for South Boulder Peak
Curated for this trail's terrain, elevation, and typical conditions.
More routes from the same lot
Same parking, same logistics — if your plans need to flex, here's what else is reachable from Chautauqua Park Trailhead.
Chautauqua Trail
Easy · 3.2 mi · 780 ft gain · 1.5–3 hours
Boulder's gateway to the Flatirons — 3.2-mi loop from downtown OSMP
Read the guide →Royal Arch
Hard · 3.4 mi · 1,400 ft gain · 2–4 hours
1,400 ft climb to a 7,040 ft sandstone arch — 3.4 mi RT from Chautauqua
Read the guide →Bear Peak
Hard · 5.5 mi · 2,850 ft gain · 3–6 hours
Boulder OSMP's high point — 8,461 ft via West Ridge or Fern Canyon
Read the guide →Enchanted Mesa
Easy · 2 mi · 416 ft gain · 1–1.5 hours
Chautauqua's gradual beginner climb toward the Flatirons
Read the guide →
More Colorado trails
Bear Peak
Hard · Boulder · 5.5 mi · 2,850 ft gain
Boulder OSMP's high point — 8,461 ft via West Ridge or Fern Canyon
Read the guide →Royal Arch
Hard · Boulder · 3.4 mi · 1,400 ft gain
1,400 ft climb to a 7,040 ft sandstone arch — 3.4 mi RT from Chautauqua
Read the guide →Chautauqua Trail
Easy · Boulder · 3.2 mi · 780 ft gain
Boulder's gateway to the Flatirons — 3.2-mi loop from downtown OSMP
Read the guide →