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Trail Conditions
- Unknown
- Snow Groomed
- Snow Packed
- Snow Covered
- Snow Cover Partial
- Freeze/thaw Cycle
- Icy
- Prevalent Mud
- Wet
- Variable
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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 Ridden
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. 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.
Activities Click to view
- Mountain Bike
701 trails
- E-Bike
321 trails
- Horse
266 trails
- Hike
915 trails
- Trail Running
915 trails
- Dirtbike/Moto
62 trails
- Observed Trials
10 trails
- ATV/ORV/OHV
52 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)
- 1,065
- Trails Mountain Bike
- 701
- Trails E-Bike
- 321
- Trails Gravel Bike
- 366
- Trails Adaptive Bike
- 215
- Trails Winter Fat Bike
- 27
- Trails Horse
- 266
- Trails Hike
- 915
- Trails Trail Running
- 915
- Trails Dirtbike/Moto
- 62
- Trails Observed Trials
- 10
- Trails ATV/ORV/OHV
- 52
- 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
- 19,108
- Photos
- 1,259
- Completed Counter
- 240,587
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 (246)
- Betasso Preserve (5)
- Boulder Open Space (2)
- Boulder Valley Ranch / Boulder Reservoir (17)
- 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 (168)
- Caribou (23)
- Magnolia (85)
- 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 • 2,654 •
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 • 2,469 •
Upper is a bi-directional trail used to access the 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 ★ 4.6 • 2 miles • 323 ft • 2,352 •
is when the fun descending of Hall Ranch begins! Climb all the way up to 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. If it has rained or...
• 95 ★ 3.7 • 4,931 ft • 0 ft • 2,074 •
is a fun trail both climbing and descending. This trail is mostly used as an alternative to climbing or descending the very technical Lower trail and can be used to access the upper parts of Hall ranch. Expect fun twisty singletrack,...
• 100 ★ 3.9 • 3,675 ft • 165 ft • 1,955 •
The connects the popular and trails. While the loops are direction for bikes, the is bidirectional with some exposure and blind corners so caution is recommended. Going from Canyon to Benji, the trail descends to a drainage and then...
• 90 ★ 4.5 • 2 miles • 61 ft • 1,946 •
Very deserving of its black diamond rating. Lower 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 brief patches...
• 90 ★ 4.0 • 2 miles • 497 ft • 1,791 •
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 that's the...
• 95 ★ 3.0 • 1,420 ft • 12 ft • 1,677 •
Singletrack connector from 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 aka "The Rock Garden" bumps this intermediate/advanced area into solid double...
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 challenge. It's primarily uphill all...
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...
Buchanan Waterfall out-and-back Featured
★ 5.0 • 7 miles • 824 ft • 1 • Out & Back •
Located at Camp Dick, it’s no secret this is probably one of the best singletracks around for fat...
South Saint Vrain - Figure 8 Featured
★ 3.8 • 16 miles • 2,150 ft • 7 • Loop •
This route is a true physical and technical test piece. Expect long, consistent rock gardens and baby...
Photos of Boulder County Mountain Bike
Videos of Boulder County Mountain Bike
Current Trail Warnings
| status | trail | date | condition | user | info |
|---|---|---|---|---|---|
| Switzerland Trail Gold Hill | Aug 16, 2026 @ 9:41am (America/Denver) 2 days | Variable | rrangerr | Chunky rock |
Recent Trail Reports
| status | trail | date | condition | info | user |
|---|---|---|---|---|---|
| Yucca Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| Tracks Ridge Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| Sage Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| River Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| Return To Top Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| Return to Halfway Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| Prickly Pear Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| Pin Cushion Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| Meadows Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA | ||
| Forest Erie Singletrack | Aug 17, 2026 @ 7:35am (America/Denver) 1 day | Unknown | WendyBMA BMA |
National Scenic Trails & Official Routes
-
Continental Divide Trail
- Mountain Bike
- Hike
- Trail Running
Activity Feed
| username | action | type | title | date |
|---|---|---|---|---|
| fjrubner | wishlist | route | activity #101798983 | Aug 18, 2026 @ 3:11pm 2 hours |
| saltybikes | ridden | trail | activity #101744097 and 1 more | Aug 17, 2026 @ 9:40pm 20 hours |
| marky-mark2021 | wishlist | trail | activity #101743086 | Aug 17, 2026 @ 8:55pm 21 hours |
| justinhoelzl | vote | trail | activity #101733384 and 1 more | Aug 17, 2026 @ 5:19pm 1 day |
| JeroenRFXm9z | wishlist | route | activity #101721814 | Aug 17, 2026 @ 1:49pm 1 day |
Recent Comments
| username | type | title | comment | date |
|---|---|---|---|---|
| trail | I agree with others, it's kind of a grunt of a... | Aug 7, 2026 @ 2:35pm Aug 7, 2026 | ||
| trail | This trail get less use that sourdough,... | Aug 7, 2026 @ 2:31pm Aug 7, 2026 | ||
| trail | Equal parts a total blast and an absolute kick... | Aug 7, 2026 @ 2:29pm Aug 7, 2026 | ||
| trail | This trail gets plenty of use, description is... | Aug 7, 2026 @ 2:25pm Aug 7, 2026 | ||
| trail | Not really a double black, but among my... | Aug 7, 2026 @ 2:19pm Aug 7, 2026 |
Local Badges
-
Epic Ride 50k1,331 awarded -
Mountain Biking 100k Badge0 awarded -
Climbing 10k Badge7 awarded -
Epic Mountain Bike Climb 2k1 awarded -
Epic Ride Descent 2k1 awarded -
Big Ride 30k3,650 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 | 701 | 741 miles | 85,627 ft | 318 miles | 6,946 ft | 1,034 | 18,814 | 86 | 262,393 | |||
| E-Bike | 321 | 399 miles | 29,104 ft | 165 miles | 6,841 ft | 4 | 10,532 | 3 | 9,264 | |||
| Gravel Bike | 366 | 487 miles | 32,986 ft | 197 miles | 6,946 ft | 2 | 2,938 | 5 | 4,126 | |||
| Adaptive Bike | 215 | 284 miles | 18,136 ft | 126 miles | 6,946 ft | 3,922 | 1 | 19 | ||||
| Winter Fat Bike | 27 | 49 miles | 5,692 ft | 21 miles | 5,564 ft | 1,688 | 4 | 16 | ||||
| Horse | 266 | 357 miles | 59,203 ft | 153 miles | 8,458 ft | 3,231 | 50 | 12 | ||||
| Hike | 915 | 1,035 miles | 155,269 ft | 448 miles | 8,632 ft | 204 | 17,495 | 82 | 30,284 | |||
| Trail Running | 915 | 1,035 miles | 155,269 ft | 448 miles | 8,632 ft | 5 | 17,492 | 80 | 34,771 | |||
| Dirtbike/Moto | 62 | 139 miles | 14,147 ft | 56 miles | 4,905 ft | 4 | 2,230 | 1 | 68 | |||
| Observed Trials | 10 | 22 miles | 2,238 ft | 10 miles | 1,788 ft | 2 | 44 | 9 | ||||
| ATV/ORV/OHV | 52 | 123 miles | 11,690 ft | 51 miles | 4,905 ft | 2,229 | 1 | 6 | ||||
| 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 | 2,998 | |||||
| Nordic Ski | 36 | 21 miles | 2,241 ft | 9 miles | 1,398 ft | 215 | 10 | 1,670 |
Frequently Asked Questions About Boulder County
▼
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:
▼
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)
- Corkscrew (4.5/5)
- GZA (4.5/5)
- Nelson Loop (4.5/5)
- Brown Town (4.4/5)
▼
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:
- July (1,228 activities)
- June (821 activities)
- August (814 activities)
▼
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.
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
- Continental Divide Overlook Viewpoint
- 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
- Crags Hotel Ruins Sight
- 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 - 25,592 views
- boulder county activity log | embed map of Boulder County mountain bike trails | boulder county mountain biking points of interest
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