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Best Hikes Near Denver by Difficulty: 5 Colorado Trails to Match Your Fitness Level
Summary
Not sure which Colorado hike is right for your current fitness level? Compare five hikes near Denver and throughout Colorado by mileage, elevation gain, starting elevation, drive time, technical class, and overall difficulty score.
How should I train for hikes with more than 3,000 feet of elevation gain?
Train with a combination of Zone 2 cardio, step-ups, split squats, loaded carries, calf strengthening, eccentric downhill work, and longer practice hikes. Your legs need strength, but your aerobic system also needs enough capacity to sustain the climb.
Topics
best hikes near Denver by difficulty, Colorado hikes near Denver, easy hikes near Denver, moderate hikes near Denver, hard hikes near Denver, Denver personal trainer, hiking conditioning, Colorado trail guide, elevation gain, hiking fitness, training for hikes, personal training Denver
Introduction
Choosing a Colorado hike is not just about mileage. A short hike can feel surprisingly hard if it starts above 11,000 feet. A moderate-distance trail can feel easy if the grade is gentle. A trail close to Denver can still challenge your legs, lungs, balance, and downhill control if the elevation gain is packed into a short distance.
That is why I created the Michael Moody Fitness trail difficulty system. Instead of only relying on a generic “easy,” “moderate,” or “hard” label, this guide compares hikes using practical factors that affect how the trail feels in real life:
Mileage
Elevation gain
Average gain per mile
Starting elevation
Distance and drive time from Denver
Technical class
Overall difficulty score
As a personal trainer in Denver, I use this information to help clients choose hikes that match their current conditioning, injury history, altitude tolerance, and goals. Some people need a lower-elevation conditioning hike near Denver. Others are preparing for 13ers, 14ers, or harder alpine routes.
This test guide features five randomly selected hikes from the Michael Moody Fitness Trail Guide. Because the selection is random, the list includes both close-to-Denver hikes and farther Colorado day-trip hikes. Use it as a sample of how the full trail guide can help you compare options by difficulty.
Table of Contents
Introduction
Quick Comparison: 5 Colorado Hikes by Difficulty
Upper Blue Lakes Reservoir via Blue Lakes Trail
Devil’s Head Lookout
Nightbird Gulch Trail
Mount Princeton Trail
Pettingell Peak via Herman Gulch Trailhead
Quick Summary: How to Choose the Right Hike
Training for Colorado Hikes
Frequently Asked Questions
Related Articles
About the Author
Quick Comparison: 5 Colorado Hikes by Difficulty
Trail Name Difficulty Score Mileage Elevation Gain Drive from Denver
Upper Blue Lakes Reservoir via Blue Lakes Trail 13.5 2.0 miles 344 feet About 110 min
Devil’s Head Lookout 13.4 3.0 miles 869 feet About 80 min
Nightbird Gulch Trail 14.0 3.4 miles 872 feet About 25 min
Mount Princeton Trail 52.5 7.2 miles 3,320 feet About 165 min
Pettingell Peak via Herman Gulch Trailhead 54.0 8.8 miles 3,313 feet About 60 min
Blue Lakes Colorado / Photo: Michael Moody Fitness
1. Upper Blue Lakes Reservoir via Blue Lakes Trail
Best for: A short high-elevation hike with manageable mileage
Location: Near Breckenridge, Colorado
Mileage: 2.0 miles
Elevation gain: 344 feet
Starting elevation: 11,425 feet
Difficulty score: 13.5
AllTrails difficulty: Easy
Technical class: Class 1
Drive from Denver: About 1 hour 50 minutes
Upper Blue Lakes Reservoir via Blue Lakes Trail looks easy on paper. It is short, the elevation gain is modest, and the route is not technically difficult. The main challenge is the starting elevation. Beginning above 11,000 feet can make breathing, pacing, and perceived effort feel different than a similar two-mile hike near Denver. This hike may be a good fit if you want a short alpine outing without committing to a long route. It is also a useful stepping stone for hikers who want to practice moving at higher elevations before trying longer mountain objectives. The mistake would be assuming that “short” automatically means “easy.” If you are sensitive to altitude, this hike may feel more demanding than the mileage suggests.
Tangible recommendations
Use this trail if you want to test your altitude tolerance without committing to a long hike. Keep the first 10–15 minutes intentionally easy. If your breathing feels unusually heavy, slow your pace before you need to stop.
Before attempting higher-altitude hikes, build a base with:
Steady Zone 2 cardio
Step-ups
Walking lunges or split squats
Calf endurance work
Breathing control during uphill efforts
Fitness note: The mileage is not the main challenge. The altitude is.
Devil's Head Lookout Trail / Photo: Michael Moody Fitness
2. Devil’s Head Lookout
Best for: A moderate climb with a rewarding destination
Location: Pike National Forest near Sedalia, Colorado
Mileage: 3.0 miles
Elevation gain: 869 feet
Starting elevation: 8,700 feet
Difficulty score: 13.4
AllTrails difficulty: Moderate
Technical class: Class 1
Drive from Denver: About 1 hour 20 minutes
Devil’s Head Lookout is a strong choice if you want a relatively short hike that still feels like a workout. With 869 feet of elevation gain over 3 miles, the climb is noticeable but not overwhelming for many recreational hikers. The lookout gives the hike a clear destination, which can be helpful if you are motivated by landmarks and finish points. The trail’s Class 1 rating means the primary challenge is the climb, not technical scrambling. For personal training clients, this type of trail can be useful because it bridges the gap between casual walking and more sustained uphill conditioning. You get a measurable climb, a rewarding destination, and a manageable total distance.
Tangible recommendations
Choose Devil’s Head Lookout if you want a moderate conditioning hike with a clear payoff. Keep your pace controlled on the climb and pay attention to your knees on the descent.
To prepare, include:
Step-ups
Goblet squats
Glute bridges
Split squats
Eccentric step-downs
Calf raises
Light hiking or incline treadmill work
Fitness note: This is a good trail for building uphill endurance, glute strength, and controlled downhill mechanics.
Nightbird Gulch Trail / Photo: Michael Moody Fitness
3. Nightbird Gulch Trail
Best for: A convenient Golden-area conditioning hike
Location: Golden, Colorado
Mileage: 3.4 miles
Elevation gain: 872 feet
Starting elevation: 5,950 feet
Difficulty score: 14.0
AllTrails difficulty: Moderate
Technical class: Class 1
Drive from Denver: About 25 minutes
Nightbird Gulch Trail is one of the most practical choices in this sample for Denver-based hikers. It is close to the city, moderate in distance, and includes enough elevation gain to feel like a real conditioning hike. At 3.4 miles with 872 feet of gain, this trail is approachable for many hikers but still challenging enough to require steady pacing. The lower starting elevation also makes it a better option than high-alpine trails if you want a workout without the added stress of thin air.
This is the type of hike I would consider for someone who wants to build hiking fitness but does not want to spend half the day driving. It is also useful for personal training clients who want a practical benchmark trail they can repeat and compare over time.
Tangible recommendations
Choose Nightbird Gulch if you want a close-to-Denver trail that trains your uphill engine without requiring a long mountain drive.
Use the trail as a conditioning test:
Track total time
Track how often you stop
Track breathing difficulty
Track knee comfort on the descent
Repeat the hike later and compare your pacing
Fitness note: This is a useful moderate trail for building hiking-specific endurance near Denver.
Quick Summary: How These First Three Hikes Compare
Upper Blue Lakes Reservoir is short but starts high, so altitude is the main challenge.
Devil’s Head Lookout is a moderate climb with a clear destination and rewarding finish.
Nightbird Gulch Trail is the most convenient Denver-area conditioning hike in this sample.
If you are newer to hiking, start with a lower-elevation option before testing high-alpine trails.
If you are training for harder hikes, repeat moderate climbs and gradually increase elevation gain.
Mount Princeton / Photo: Michael Moody Fitness
4. Mount Princeton Trail
Best for: Experienced hikers preparing for or pursuing 14ers
Location: San Isabel National Forest near Buena Vista and Nathrop, Colorado
Mileage: 7.2 miles
Elevation gain: 3,320 feet
Starting elevation: 10,830 feet
Difficulty score: 52.5
AllTrails difficulty: Strenuous
Technical class: Class 2
Drive from Denver: About 2 hours 45 minutes
Mount Princeton Trail is a major jump in difficulty compared with the first three hikes. The combination of 7.2 miles, 3,320 feet of elevation gain, high starting elevation, and Class 2 terrain makes this a serious mountain objective.
This is not a casual beginner hike. The route requires stronger uphill conditioning, better foot placement, more attention to weather, and more respect for pacing. Class 2 terrain can include rockier, rougher, or more uneven sections than a simple walking trail. The elevation gain is the key factor. More than 3,000 feet of climbing changes the training demand. You need aerobic capacity, leg strength, hip stability, calf endurance, trunk control, and the ability to descend without your knees or lower back taking over.
Tangible recommendations
Do not use Mount Princeton as your first hard Colorado hike. Build toward it with progressively harder trails and longer climbs.
Before attempting a hike like this, your training should include:
Long Zone 2 cardio sessions
Step-ups with controlled tempo
Rear-foot-elevated split squats
Loaded carries
Calf raises and tibialis raises
Downhill-focused eccentric quad work
Balance and ankle stability drills
Practice hikes with 1,500–2,500 feet of gain
Fitness note: This route requires more than general fitness. It requires mountain-specific preparation.
5. Pettingell Peak via Herman Gulch Trailhead
Best for: Advanced hikers seeking a hard high-alpine route
Location: Near Herman Gulch, Colorado
Mileage: 8.8 miles
Elevation gain: 3,313 feet
Starting elevation: 10,300 feet
Difficulty score: 54.0
AllTrails difficulty: Hard
Technical class: Class 2
Drive from Denver: About 1 hour
Pettingell Peak via Herman Gulch Trailhead is the hardest hike in this sample by difficulty score. It combines nearly 9 miles of hiking, more than 3,300 feet of gain, a high starting elevation, and Class 2 alpine terrain. This hike is better suited for experienced hikers than casual trail users. The drive from Denver is relatively reasonable, but the physical demand is high. That can be deceptive. A trail does not become easy because it is close to the city. The challenge here is the full combination of distance, gain, altitude, terrain, and descent. You need enough aerobic capacity to keep moving uphill, enough strength to handle steep sections, and enough control of movement to descend safely when fatigued.
Tangible recommendations
Choose Pettingell Peak only if you already have experience with long, high-elevation hikes and sustained climbing.
Before attempting a route like this, make sure you can comfortably complete:
6–8 miles on moderate terrain
2,000+ feet of elevation gain
Several hours of continuous hiking
Uneven trail descents without knee pain
High-elevation hikes without major altitude symptoms
A weekly training structure may include:
2–3 strength sessions
1–2 Zone 2 cardio sessions
1 longer hike or stair/incline session
Mobility and corrective exercise work for ankles, hips, thoracic spine, and trunk control
Fitness note: This hike demands long-climb endurance, high-altitude pacing, uneven-terrain balance, and a strong descent strategy.
Quick Summary: How to Choose the Right Hike
Choose Nightbird Gulch Trail if you want a convenient moderate hike close to Denver.
Choose Devil’s Head Lookout if you want a short but rewarding climb with a clear destination.
Choose Upper Blue Lakes Reservoir via Blue Lakes Trail if you want a short high-elevation hike and are comfortable starting above 11,000 feet.
Choose Mount Princeton Trail if you are an experienced hiker preparing for strenuous 14er-style terrain.
Choose Pettingell Peak via Herman Gulch Trailhead if you want a hard high-alpine challenge with significant elevation gain and Class 2 terrain.
The best hike is not always the shortest, closest, or most popular. The best hike is the one that matches your current fitness, experience, altitude tolerance, and recovery capacity.
Training for Colorado Hikes
Colorado hikes require more than walking endurance. Uphill hiking challenges your aerobic system, glutes, calves, quads, and breathing control. Downhill hiking challenges your knees, ankles, hips, trunk stability, and eccentric strength. That is why a hiking-specific training plan should include more than random cardio. You need a blend of strength, endurance, mobility, balance, and movement quality.
Add this 20-minute hiking conditioning template
Use this as a simple hiking-prep session:
Step-ups: 3 sets of 8–10 per side
Goblet squat: 3 sets of 8–10
Romanian deadlift: 3 sets of 8–10
Eccentric step-down: 2 sets of 6–8 per side
Farmer carry or suitcase carry: 3 rounds of 30–45 seconds
Calf raises: 2–3 sets of 12–15
Dead bug or Pallof press: 2 sets of 8–10 per side
This does not replace hiking. It supports hiking. The goal is to build stronger legs, better joint control, and more resilience so your body can tolerate both the climb and the descent.
For more hiking preparation, read:
Hiking Conditioning Workouts for Colorado Trails
Frequently Asked Questions
What is the best hike near Denver for building fitness?
Nightbird Gulch Trail is a practical option in this sample because it is close to Denver, moderately challenging, and offers enough elevation gain to build uphill endurance without requiring a long drive.
Is mileage or elevation gain more important when choosing a hike?
Both matter, but elevation gain often changes how hard a hike feels more than mileage alone. A short trail with a steep climb may feel harder than a longer, flatter hike.
What makes a Colorado hike harder than expected?
A hike may feel harder than expected because of high starting elevation, steep average grade, uneven terrain, exposure, heat, snow, wind, poor pacing, or a demanding descent.
What is a good beginner-friendly hiking progression?
Start with lower-elevation hikes that are shorter and less steep. Then gradually increase one variable at a time: mileage, elevation gain, starting elevation, or technical difficulty. Avoid increasing all of them at once.
Can a personal trainer help me prepare for harder Colorado hikes?
Yes. A qualified personal trainer can help you build a hiking-specific plan that improves uphill endurance, downhill knee control, hip stability, ankle strength, balance, and overall conditioning while accounting for previous injuries or movement limitations.
ABOUT THE AUTHOR: MICHAEL MOODY, PERSONAL TRAINER
As an author, a personal trainer in Denver, and a podcast host, Michael Moody has helped personal training clients reach new fitness heights and achieve incredible weight-loss transformations since 2005. He also produces the wellness podcast "The Elements of Being" and has been featured on NBC, WGN Radio, and PBS.
Michael offers personal training to Denver residents who want to meet at the 2460 W 26th Ave studio….or in their homes throughout LoHi (80206), LoDo (80202), RiNo (80216), Washington Park (80209), Cherry Creek (80206, 80209, 80243, 80246, 80231), and Highlands (80202, 80211, 80212). Michael also offers personal training sessions in Jefferson Park (80211) and Sloan's Lake (80204, 80212).
If you’re looking for a personal trainer who can curate a sustainable (and adaptable) routine based on your needs and wants, Michael is the experienced practitioner you’ve been looking for. Try personal training for a month…your body will thank you!
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