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Trail Conditions
- Unknown
- Snow Groomed
- Snow Packed
- Snow Covered
- Snow Cover Partial
- Freeze/thaw Cycle
- Icy
- Prevalent Mud
- Wet
- Variable
- Ideal
- Dry
- Very Dry
Trail Flow (Ridden Direction)
Trailforks scans users activity logs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of users are riding a trail in its intended direction.
The colour categories are based on what percentage of users are riding a trail in its intended direction.
- > 96%
- > 90%
- > 80%
- > 70%
- > 50%
- < 50%
- bi-directional trail
- no data
Trail Last Used
Trailforks scans activity logs to determine the last time a trail was ridden.
- < 2 days
- < 1 week
- < 2 weeks
- < 1 month
- < 6 months
- > 6 months
Trail Ridden Direction
The intended direction a trail should be ridden.
- Downhill Only
- Downhill Primary
- Both Directions
- Uphill Primary
- Uphill Only
- One Direction
Contribute Details
Colors indicate trail is missing specified detail.
- Description
- Photos
- Description & Photos
- Videos
Trail Popularity ?
Trailforks scans activity logs to determine which trails are ridden the most in the last 9 months.
Trails are compared with nearby trails in the same city region with a possible 25 colour shades.
Think of this as a heatmap, more activities = more kinetic energy = warmer colors.
- most popular
- popular
- less popular
- not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches
US Cell Coverage
Legend
Radar Time
Activity Recordings
Trailforks uses anonymized public activity data.
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Activity Recordings
Trailforks uses anonymized public activity data.
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Winter Trails
Warning
A routing network for winter maps does not exist. Selecting trails using the winter trails layer has been disabled.
Missing Trails
Most Popular
Least Popular
Trails are colored based on popularity. The more popular a trail is, the more red. Less popular trails trend towards green.
Jump Magnitude Heatmap
Heatmap of where users jump on trails. Zoom in to see individual jumps, click circles to view jump details.
BC Backroad Status
![map legend]()
Service Road Atlas is a free to use, community-driven service for viewing and creating reports on the numerous back-country service roads around B.C. and Alberta.
Slope Aspect
Direction the slope faces
Trails Deemphasized
Trails are shown in grey.
Only show trails with no bike usage.
Suggested Layers
Based on selected activity type
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SavePopular Trail Networks
view all areas »Boulder County trails and routes are listed on Trailforks with interactive trail maps, difficulty ratings, photos, and user-reported trail conditions. The Trailforks community has mapped thousands of trails and shared thousands of photos in this region. Supported activity types include Hiking, Trail Running, Mountain Biking, E-Biking, Horseback, Skiing, Dirtbiking, ATVing/Offroading, Snowshoeing, Nordic Skiing, Backcountry Skiing, Observed Trials and Snowmobiling. Trails here are often faint trail, flowy and loose. Scenery includes lakes, creeks and views. Common trail features include jumps, berms and drops. Many trails are family friendly. Amenities include restrooms and huts. Popular destinations include Boulder, Nederland and Boulder Open Space.
This is an auto-generated description of Boulder County.
Login or register to submit a custom description.
Trail info last updated
Activities Click to view
- Mountain Bike
705 trails
- E-Bike
322 trails
- Horse
269 trails
- Hike
915 trails
- Trail Running
915 trails
- Dirtbike/Moto
63 trails
- Observed Trials
10 trails
- ATV/ORV/OHV
53 trails
- Snowmobile
8 trails
- Snowshoe
48 trails
- Downhill Ski
67 trails
- Backcountry Ski
22 trails
- Nordic Ski
36 trails
Stats
- Avg Trail Rating
- Trails (view details)
- 1,064
- Trails Mountain Bike
- 705
- Trails E-Bike
- 322
- Trails Gravel Bike
- 366
- Trails Adaptive Bike
- 215
- Trails Winter Fat Bike
- 27
- Trails Horse
- 269
- Trails Hike
- 915
- Trails Trail Running
- 915
- Trails Dirtbike/Moto
- 63
- Trails Observed Trials
- 10
- Trails ATV/ORV/OHV
- 53
- Trails Snowmobile
- 8
- Trails Snowshoe
- 48
- Trails Downhill Ski
- 67
- Trails Backcountry Ski
- 22
- Trails Nordic Ski
- 36
- Total Distance
- 1,086 miles
- Total Descent
- 178,487 ft
- Total Vertical
- 8,630 ft
- Highest Trailhead
- 13,460 ft
- Reports
- 19,188
- Photos
- 1,274
- Completed Counter
- 248,880
Articles
Boulder County Proposes Major Trail Restrictions for Mountain Bikers
May 11, 2026 from pinkbike.com
Access at Hall Ranch and Heil Valley is under fire. Learn how a "design problem" is being treated as a "user problem" and how you can take action.
More Than Miles: Here’s How to Plan the Perfect Runcation
Aug 1, 2025 from outsideonline.com
Running trips—from Utah's desert to Patagonia's peaks—offer the most thrilling (and humbling) adventures this writer's ever experienced.
An Insider’s Guide to the Best Hikes in Boulder, Colorado
Feb 26, 2024 from outsideonline.com
After 25 years of hiking in his hometown of Boulder, guidebook author James Dziezynski reveals his all-time favorite treks in the area. Plus,...
Sub Regions
- Allenspark (13)
- Taylor Mountain (9)
- Boulder (248)
- Betasso Preserve (5)
- Boulder Open Space (2)
- Boulder Valley Ranch / Boulder Reservoir (19)
- CU South Campus (11)
- Eldorado Canyon State Park (0)
- Lefthand OHV (63)
- Marshall Mesa/Doudy Draw/Flatirons Vista (20)
- Teller Farm Open Space (3)
- The People's Crossing Park (0)
- Valmont Bike Park (43)
- Walker Mountain (17)
- Walker Ranch (3)
- Erie (33)
- Erie Singletrack (11)
- Gunbarrel (22)
- Jamestown (13)
- Ceran Saint Vrain (15)
- Lafayette (12)
- Longmont (27)
- Louisville (63)
- Davidson Mesa (16)
- Lyons (19)
- Nederland (170)
- Caribou (24)
- Magnolia (86)
- Mud Lake (14)
- Sugarloaf Mountain (1)
- Tolland (9)
- Niwot (7)
- Superior (14)
- Coyote Ridge (8)
- Ward (30)
- Gold Hill (5)
Popular Boulder County Mountain Biking Trails
• 100 ★ 3.2 • 2 miles • 90 ft • 2,684 •
Mayhoffer Singltree is another connector piece of the Dirty Bismark loop. It was one of the final sections opened. The trail has a very nice easy grade and no rocks at all! It's fantastic for beginners and young 'uns.
• 100 ★ 4.2 • 1 mile • 448 ft • 2,508 •
Upper Bitterbrush is a bi-directional trail used to access the Nelson loop at the top of Hall ranch. The climb up is smooth, sustained, and easy. The descent is very fast and fun, mostly smooth with only one or two rocky sections!
• 100 ★ 4.7 • 2 miles • 323 ft • 2,386 •
Nelson loop is when the fun descending of Hall Ranch begins! Climb all the way up to Nelson loop and prepare for a fast descent the entire way down! This trail is a bi-directional loop but is best when ridden in a clockwise direction....
• 95 ★ 3.8 • 4,931 ft • 0 ft • 2,115 •
Antelope is a fun trail both climbing and descending. This trail is mostly used as an alternative to climbing or descending the very technical Lower Bitterbrush trail and can be used to access the upper parts of Hall ranch. Expect fun...
• 100 ★ 3.9 • 3,675 ft • 165 ft • 2,000 •
The Loop Link connects the popular Canyon Loop and Benjamin Loop trails. While the loops are direction for bikes, the Loop Link is bidirectional with some exposure and blind corners so caution is recommended. Going from Canyon to Benji,...
• 90 ★ 4.4 • 2 miles • 61 ft • 1,974 •
Very deserving of its black diamond rating. Lower Bitterbrush reminds me of desert riding in southern Utah, almost like a steeper version of UPS/LPS in Moab. Suffice it to say, there are many technical rock features, interspersed with...
• 90 ★ 4.0 • 2 miles • 497 ft • 1,830 •
Benjamin Loop is directional for bikers, and the direction changes approximately every four weeks. Please follow posted signs. The preferred direction from the Link Loop is clockwise (not that you have a choice, just be excited if...
• 90 ★ 3.0 • 1,420 ft • 12 ft • 1,715 •
Singletrack connector from Doudy Draw to Springbook Loop.
Boulder County Mountain Bike Routes
Hall Ranch Technical Side Featured
★ 5.0 • 10 miles • 1,594 ft • 6 • Out & Back •
Tackling Hall Ranch up Lower Bitterbrush aka "The Rock Garden" bumps this intermediate/advanced area into...
Hall Ranch: Intermediate Fun Featured
★ 4.4 • 7 miles • 1,191 ft • 5 • Out & Back •
This is an great alternative if you're not up to the black diamond Lower Bitterbrush challenge. It's...
Marshall Mesa Doudy Draw Loop Featured
★ 4.0 • 12 miles • 988 ft • 14 • Loop •
This route gives a great tour of the best trails Marshall Mesa has to offer. The ride starts at the main...
Marshall Mesa Beginner Ride Featured
★ 4.0 • 5 miles • 272 ft • 1 • Out & Back •
The Boulder Mountainbike Alliance's Recommendation for Easiest Ride at Marshall Mesa. People in Boulder...
Hall Ranch Technical Descent Featured
★ 3.8 • 12 miles • 1,670 ft • 5 • Loop •
By far the best way to ride Hall Ranch. This ride is best started by parking in the town of Lyons either...
North Boulder MTB Featured
★ 5.0 • 12 miles • 854 ft • 5 • Loop •
Starting in 2024, singletrack options north of Boulder just got a whole lot better! The North Sky trail...
Photos of Boulder County Mountain Bike
Videos of Boulder County Mountain Bike
Current Trail Warnings
| status | trail | date | condition | user | info |
|---|---|---|---|---|---|
| Schoolhouse Loop Heil Valley Ranch | Oct 14, 2026 @ 5:54pm (America/Denver) 10 hours | Prevalent Mud | WendyBMA BMA | Closed for muddy conditions. Status will... | |
| Overland Loop Heil Valley Ranch | Oct 14, 2026 @ 5:54pm (America/Denver) 10 hours | Prevalent Mud | WendyBMA BMA | Closed for muddy conditions. Status will... | |
| Antelope Hall Ranch | Oct 14, 2026 @ 3:29pm (America/Denver) 12 hours | Prevalent Mud | WendyBMA BMA | Closed for muddy conditions. Status will... |
Recent Trail Reports
National Scenic Trails & Official Routes
-
Continental Divide Trail
- Mountain Bike
- Hike
- Trail Running
Activity Feed
| username | action | type | title | date |
|---|---|---|---|---|
| WendyBMA | add | report | activity #105899034 and 1 more | Oct 14, 2026 @ 4:54pm 10 hours |
| WendyBMA | add | report | activity #105890963 | Oct 14, 2026 @ 2:30pm 12 hours |
| WendyBMA | add | report | activity #105879716 and 1 more | Oct 14, 2026 @ 10:51am 16 hours |
| WendyBMA | add | report | activity #105864637 and 6 more | Oct 14, 2026 @ 6:49am 20 hours |
| MatteOL5Ms | wishlist | route | activity #105808835 | Oct 13, 2026 @ 8:00am 2 days |
Recent Comments
| username | type | title | comment | date |
|---|---|---|---|---|
| trail | More green than blue. Not sure why this... | Oct 13, 2026 @ 7:45am 2 days | ||
| trail | ass kicker of a climb but fun going down. I'll... | Sep 21, 2026 @ 3:36pm Sep 21, 2026 | ||
| trail | The Vortex Bike Park | Sep 9, 2026 @ 9:17am Sep 9, 2026 | ||
| trail | The. Perez Bike Park | Sep 9, 2026 @ 9:17am Sep 9, 2026 | ||
| trail | The bus is still there. Not certain why the... | Sep 7, 2026 @ 1:56pm Sep 7, 2026 |
Local Badges
-
Epic Ride 50k1,335 awarded -
Mountain Biking 100k Badge0 awarded -
Climbing 10k Badge7 awarded -
Epic Mountain Bike Climb 2k1 awarded -
Epic Ride Descent 2k1 awarded -
Big Ride 30k3,671 awarded
Bike & Skill Parks
| name | type | city | rating |
|---|---|---|---|
| Eldora Mountain Resort | bike park | Nederland | |
| Valmont Bike Park | skill park | Boulder | |
| Lyons Bike Park | skill park | Lyons | |
| Velosolutions Pump Track Superior, Colorado | skill park | Superior | |
| IMI Motorsports Complex | skill park | Erie |
Activity Type Stats
| activitytype | trails | distance | descent | descent distance | total vertical | rating | global rank | state rank | photos | reports | routes | activity logs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mountain Bike | 705 | 741 miles | 85,627 ft | 318 miles | 6,946 ft | 1,042 | 18,894 | 87 | 270,901 | |||
| E-Bike | 322 | 399 miles | 29,104 ft | 165 miles | 6,841 ft | 4 | 10,603 | 3 | 9,810 | |||
| Gravel Bike | 368 | 487 miles | 32,986 ft | 197 miles | 6,946 ft | 2 | 2,939 | 5 | 4,579 | |||
| Adaptive Bike | 217 | 284 miles | 18,136 ft | 126 miles | 6,946 ft | 3,923 | 1 | 19 | ||||
| Winter Fat Bike | 27 | 49 miles | 5,692 ft | 21 miles | 5,564 ft | 1,688 | 4 | 16 | ||||
| Horse | 269 | 357 miles | 59,203 ft | 153 miles | 8,458 ft | 3,232 | 50 | 13 | ||||
| Hike | 915 | 1,034 miles | 155,269 ft | 448 miles | 8,632 ft | 210 | 17,574 | 82 | 31,677 | |||
| Trail Running | 915 | 1,034 miles | 155,269 ft | 448 miles | 8,632 ft | 7 | 17,571 | 80 | 36,209 | |||
| Dirtbike/Moto | 63 | 139 miles | 14,147 ft | 56 miles | 4,905 ft | 4 | 2,230 | 1 | 80 | |||
| Observed Trials | 10 | 22 miles | 2,238 ft | 10 miles | 1,788 ft | 2 | 44 | 9 | ||||
| ATV/ORV/OHV | 53 | 123 miles | 11,690 ft | 51 miles | 4,905 ft | 2,229 | 1 | 7 | ||||
| Snowmobile | 8 | 18 miles | 1,634 ft | 6 miles | 1,801 ft | 17 | 1 | 2 | ||||
| Snowshoe | 48 | 73 miles | 7,792 ft | 27 miles | 7,152 ft | 215 | 44 | 278 | ||||
| Downhill Ski | 67 | 19 miles | 18,117 ft | 18 miles | 1,342 ft | 7 | 3,893 | |||||
| Backcountry Ski | 22 | 36 miles | 1,273 ft | 6 miles | 4,357 ft | 182 | 2,987 | |||||
| Nordic Ski | 36 | 21 miles | 2,241 ft | 9 miles | 1,398 ft | 215 | 10 | 1,671 |
Frequently Asked Questions
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What are the best places to ride in Boulder County?
Boulder County has 38 areas to explore for mountain biking. The top rated areas are:
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What are the highest rated mountain biking trails in Boulder County?
The highest rated mountain biking trails in Boulder County are:
- Slopestyle L (4.6/5)
- Nelson Loop (4.5/5)
- Corkscrew (4.5/5)
- GZA (4.5/5)
- Brown Town (4.4/5)
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What is the best time of the year to ride in Boulder County?
Based on activity log data, the most popular months to ride in Boulder County are:
- August (2,244 activities)
- September (2,159 activities)
- June (2,007 activities)
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What is the longest trail in Boulder County?
The longest trail in Boulder County is Coal Creek Trail at 14.5 miles. View all trails sorted by distance.
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What are the best & highest rated hiking trails in Boulder County?
The best hiking trails in Boulder County are: View all hiking trails sorted by popularity score.
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What are the best & highest rated trail running trails in Boulder County?
The best trail running trails in Boulder County are: View all trail running trails sorted by popularity score.
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What are the best & highest rated dirtbiking trails in Boulder County?
The best dirtbiking trails in Boulder County are: View all dirtbiking trails sorted by popularity score.
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How many trails are in Boulder County?
Boulder County has a total of 1,063 trails. Of those, 704 are designated for mountain biking. Browse top mountain biking trails in Boulder County to find detailed information including difficulty ratings, distances, and trail conditions.
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Which trail has the most elevation gain in Boulder County?
The trail with the most elevation gain in Boulder County is Walker Ranch Loop with 1,559 ft of elevation gain. View all trails sorted by elevation gain.
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Which trail has the most elevation descent in Boulder County?
The trail with the most elevation descent in Boulder County is South St Vrain with 1,733 ft of elevation descent. View all trails sorted by elevation descent.
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What activities are most popular in Boulder County?
Boulder County supports the following activities: Mountain Biking, E-Biking, Horseback, Hiking, Trail Running, Dirtbiking, Observed Trials, ATVing/Offroading, Snowmobiling, Snowshoeing, Skiing, Backcountry Skiing, Nordic Skiing.
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What bike services are there in Boulder County?
The following bike services are available in Boulder County:
- Bike Shop (22)
- Trail Association (4)
- Coaching & Camps (2)
- Race Team (1)
- Guides & Tours (1)
- Other (1)
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What are the steepest mountain biking trails in Boulder County?
The steepest mountain biking trail in Boulder County is RZA Climb with an average grade of 27.2%. View all trails sorted by grade.
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Are there any trails with scenic viewpoints in Boulder County?
Yes, there are 9 scenic viewpoints marked along trails in Boulder County. Some popular viewpoints include: Explore more points of interest to find trails with the best views.
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Are there any trails with waterfalls in Boulder County?
Yes, there are 1 waterfall locations noted along trails in Boulder County. View the points of interest map to discover trails near waterfalls.
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What trails have the biggest jumps in Boulder County?
The trails with the biggest jumps in Boulder County are: Browse all mountain bike trails to find trails with jumps and technical features.
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Are the trails open in Boulder County?
The overall region status for Boulder County is Clear / Green. Out of 597 trails:
- Clear / Green: 536
- Minor Issue / Yellow: 26
- Significant Issue / Amber: 12
- Closed: 23
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What are the trail conditions in Boulder County?
Based on trail reports from the past week in Boulder County:
- Ideal: 1 trail
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Can I ride an ebike in Boulder County?
Yes, Boulder County supports e-bike riding. There are 277 trails in Boulder County that allow e-bikes. Check the e-bike trails listing for specific trail access details and any local regulations.
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What are the most popular mountain biking routes in Boulder County?
The most popular mountain biking routes in Boulder County are: View all mountain biking routes in Boulder County.
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What type of bike is most common in Boulder County?
Based on activity log data, the most common bike types used in Boulder County are:
- AM (1,032 activities)
- XC (290 activities)
- CX (24 activities)
- DH (17 activities)
- Gravel (16 activities)
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What is the highest summit in Boulder County?
The highest summit in Boulder County is North Arapaho Peak at 13,451 ft elevation.
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What are the top sights to see in Boulder County?
There are 5 notable sights in Boulder County. Some of the top sights include: Explore all points of interest in Boulder County.
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What are the most popular Strava Segments in Boulder County?
The most popular Strava segments in Boulder County are:
- open sky sprint (34,622 athletes)
- Hwy 36: Overlook -> Cherryvale (25,212 athletes)
- 1st Canyon to 2nd Canyon Bridge (24,786 athletes)
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What are some popular technical trail features in Boulder County?
There are 7 technical trail features (TTFs) in Boulder County. Some popular features include:
- The Clavicle (Rock Face)
- The Rock Face (Rock Face)
- Sam's Club (Rock Garden)
- The Drop (Drop)
- The Rock Garden (Rock Garden)
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What trails are closed in Boulder County?
There are currently 23 closed trails in Boulder County. The breakdown of all trail statuses is:
- Clear / Green: 536
- Minor Issue / Yellow: 26
- Significant Issue / Amber: 12
- Closed: 23
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Are there local clubs or events in Boulder County?
There are 4 local clubs or associations listed in the Boulder County directory. Browse the local directory for details.
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Are there any mountain biking guiding or tour operators in Boulder County?
Yes, there are mountain biking guiding and tour operators in Boulder County: Browse all guiding and tour operators in Boulder County.
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What are the most popular mountain biking trails in Boulder County?
The most popular mountain biking trails in Boulder County are: View all mountain biking trails sorted by popularity.
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What are the best beginner ride trails in Boulder County?
The best beginner mountain biking trails in Boulder County are:
- North Sky Trail (3.9/5)
- Valmont Paved Pumptrack (5/5)
- South Boulder Creek Path (5/5)
Activities
- Boulder County Mountain Biking Trails
- Boulder County E-Biking Trails
- Boulder County Horseback Trails
- Boulder County Hiking Trails
- Boulder County Trail Running Trails
- Boulder County Dirtbiking Trails
- Boulder County Observed Trials Trails
- Boulder County ATVing/Offroading Trails
- Boulder County Snowmobiling Trails
- Boulder County Snowshoeing Trails
- Boulder County Skiing Trails
- Boulder County Backcountry Skiing Trails
- Boulder County Nordic Skiing Trails
Trails
Points of Interest
- Caribou Lodge
- Paiute Peak Summit
- Nordic Center Lodge
- Guinn Mountain Summit
- Guinn Mountain Hut Cabin
- Indian Peak Lodge
- South Boulder Peak Summit
- Shirttall Peak Summit
- Nebel Horn Summit
- Continental Divide Overlook Viewpoint
- North Arapaho Peak (13,451 ft)
- Apache Peak (13,445 ft)
- South Arapaho Peak (13,392 ft)
- By roaming50
& contributors - Admins: jpmcghee, msmcfate, cmcquade, BMA, mattoid, amrosen, getvert, mpopetz, Pumpntrail, andrewbikeboulder
- #15769 - 26,170 views
- boulder county activity log | embed map of Boulder County mountain bike trails | boulder county mountain biking points of interest
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