Upper Bitterbrush Trail

Trail Meter: 

The yang to Lower Bitterbrush's yin. This trail is pretty mellow, wide and only has a couple of easy rocky spots. It's the way up to the Nelson Loop if you are planning on making a bigger ride out of your trip to Hall. From the bench near the trail junction of Lower Bitterbrush and Antelope, head west and downhill. This downhill is short followed by an uphill that will take you past another great prairie dog town and onto the ridge line. Over time, this trail has seen a lot of wear from the large number of people on it. Please try to stay in the middle of the trail as much as possible to allow for the singletrack to stay single.

This trail tops out at the base of the Nelson Loop. You'll notice the trail widening after a short section of roots and rocks. This is a popular spot for hikers and bikers to catch their breath before heading up!

Coming down:
This trail is a ripper on the way back down! It's got great flow for the intermediate rider, with a lot of fun swoopy turns that really put a smile on your face. Two words here. One, this trail has a lot of loose sandy stuff on it. People regularly come down this trail too hot and find themselves upside down before they can blink. Two, this is a super popular trail with a lot of blind corners and a lot of people (many who will be scared by bike riders coming downhill and likely unprepared to avoid you). Keep your speed under control and be respectful. Going downhill, you're the one who yields - and that doesn't mean riding off the trail to avoid other people, man! It means slowing way the hell down and stopping if necessary to make sure that uphill traffic isn't afraid/startled/put out/killed.

Upper Bitterbrush GPX File50.03 KB
Upper Bitterbrush Google Earth File2.22 KB
Hall Ranch Kiosk Map776.02 KB
Map to Trail Head: 

View Boulder County Trailheads in a larger map

Upper Bitterbrush Trail Click on image to enlarge
Upper Bitterbrush Trail Click on image to enlarge

T: 5 A: 5 C: 5

Learn more about BMA Rating
Learn More About Trail Difficulty Ratings
1.4 mi.
360 ft.


Trail Meter: Poor»Fair

From noon 4/20: Junction to Loop is OK with a few very wet-to-muddy spots. Go through, not around, or don't ride.

Trail Meter: Good»Poor


Dry and good to go....

Trail Meter: Fair»Good

dry and ride-ready!

Trail Meter: Good»Fair

A little wet but by the time all of you desk jockeys get out there this afternoon it'll be perfecto

Dry and wonderful

Trail Meter: Fair»Good

Pretty much no mud

Trail Meter: Good»Fair

Mud is minimal

Trail Meter: Fair»Good

Pretty darn dry

Trail Meter: Poor»Fair

Totally rideable but there are definitely some muddy stretches. Nothing bad though. As you get closer to the Nelson Loop, it gets snow-covered and muddy, so you'll probably need to turn around before reaching the loop.

BMA needs your help updating trail conditions. Please register for an account on our website - it's free, fast, and instantly makes you part of the BMA trail community