From Red Rocks to a Glacier Lake: A Seven‑Hour Colorado Day Trip That Has It All
A one‑day private route from Red Rocks to a glacial lake and thermal baths—seven hours of geology, grit and a hot spring finish
You pull off the highway before the morning sun has fully warmed the red sandstone and the amphitheater sits like an organ carved out of time — rigid ribs of rock catching the first light. The driver flips off the engine, and for a moment the city behind you feels like a different country. Red Rocks is the warmup: wide, easy paths and a skyline that reads Denver in the distance. But the day is only getting started. A gravel road winds up into the high country and the landscape tightens into a stack of pines, talus slopes and a small, stubborn body of ice and water that locals still call a glacier.
Trail Wisdom
Acclimatize and hydrate
Saint Mary’s sits near 11,000 ft; drink water before you start and take it slow to avoid altitude fatigue.
Layer for shifting conditions
Bring a windproof shell and an insulating midlayer—mountain weather changes fast, even in summer.
Microspikes in shoulder seasons
If snow is present (spring or fall), microspikes or crampons make traversing the snowfield far safer.
Time for lightning safety
Start early; aim to be off exposed ridgelines by early afternoon to avoid thunderstorms.
Local Knowledge
Hidden Gems
- •Lower Red Rocks trails for quiet morning light and views of the amphitheater without the crowds
- •The small miner’s cemetery and historical markers around Idaho Springs for a quick local history stop
Wildlife
Mule deer, Golden eagle and other raptors hunting the ridgelines
Conservation Note
Stick to established trails to protect fragile alpine soils and perennial snowfields; pack out all trash and avoid disturbing plants or wildlife.
Red Rocks’ amphitheater and surrounding formations are part of a remarkable geological ridge used by Indigenous peoples and later adapted into a concert venue in the 20th century; Idaho Springs grew as a mining supply hub during Colorado’s Gold Rush.
Seasonal Guide
spring
Best for: wildflower pockets at lower elevations, late snowfield photography
Challenges: patchy trail conditions, cold nights and wet snow
Spring can be a mix of mud, lingering snow and sudden sun—expect routefinding and bring traction devices.
summer
Best for: clear trail approaches, warm soaking at Indian Hot Springs
Challenges: afternoon thunderstorms, strong UV and heat at lower elevations
Summer offers the most reliable trail access but start early to avoid afternoon storms and crowds.
fall
Best for: bright, crisp air and fewer crowds, dramatic light for photography
Challenges: early snowfall at elevation, shorter daylight hours
Fall delivers brilliant clarity and cooler temps; bring warm layers and be ready for sudden weather shifts.
winter
Best for: sledding and snow play near the glacier, steam‑filled hot springs after a cold day
Challenges: deep snow, icy slopes, possible road closures
Winter transforms the route—use proper winter gear and respect avalanche and icy conditions.
Photographer's Notes
What to Bring
Sturdy hiking bootsEssential
Support and traction on rocky talus and steep trail sections.
Microspikes or light crampons
Useful on lingering snowfields and icy approaches to the lake.
Insulating midlayer + wind shellEssential
Layering handles variable mountain conditions and wind at higher elevation.
Water reservoir (1–2L) and snacksEssential
High altitude and exertion dehydrate quickly—easy calories keep energy steady.
Common Questions
How long is the hike to Saint Mary’s Glacier?
The round trip is typically 1.5–2 miles with roughly 400–500 ft of elevation gain depending on how far you descend to the lake.
Is the ‘glacier’ a true glacier?
Saint Mary’s is best described as a perennial snowfield and cirque with glacial remnants—not a large, flowing glacier but a dramatic, ice‑fed pocket below the cliffs.
Do we need permits?
No special permits are generally required for this private tour, but local parking or access rules can change seasonally—your guide will handle logistics.
Can children or older guests do the hike?
Families with older kids who are steady on rocky trails can manage; gauge the group’s balance and altitude tolerance before committing.
What if it snows or is icy?
In winter and early spring, microspikes or crampons and winter boots are recommended; the guide will advise on conditions and may offer sledding if safe.
Is there cell service along the route?
Cell coverage is intermittent in the higher stretches around Saint Mary’s; plan accordingly and rely on your guide for emergency communication.
What to Pack
Hiking boots (support on talus), 1–2L water (altitude hydration), windproof layer (weather change), Sunscreen and sunglasses (strong alpine sun)
Did You Know
Despite its name, Saint Mary’s "Glacier" is a remnant cirque and perennial snowfield rather than a large, flowing glacier—its persistent ice is a relic of the last glacial period.
Quick Travel Tips
Leave Denver early to avoid traffic and afternoon storms; bring cash or card for Idaho Springs lunch; check snow conditions if booking shoulder seasons; expect intermittent cell service in the high country
Local Flavor
After the hike, head to Idaho Springs for a hearty cowboy lunch or a slice at Beau Jo’s Mountain Pizza, then sample local brews at Tommyknocker Brewery. Finish with a soak at Indian Hot Springs—choose the thermal pools for a quick dip or the cavern soak for a quieter, steam‑filled experience.
Logistics Snapshot
Closest airport: Denver International Airport (DEN). Typical driving times: Denver to Red Rocks ~25 minutes; Denver to Saint Mary’s trailhead ~55–75 minutes. Cell service: intermittent near the glacier. Permits: none typically required for this private tour; parking rules may vary seasonally.
Sustainability Note
This itinerary visits sensitive alpine habitat and developed hot springs—pack out all waste, stay on marked trails to avoid trampling fragile tundra, and follow hot springs rules to protect water quality.