6 miles
Distance
1,060 ft
Climb
-1,063 ft
Descent
2 miles
High Point

This ride is one of the funnest stretches of creekside singletrack in Boulder County...followed by a heinous climb up to Miller Rock. From the trailhead you ride downhill following narrow, twisty singletrack - super flowy with the occasional tough technical move. And don't fall on those technical spots either as the steep drop to South St. Vrain Creek has claimed more than a few collarbones over the years.

At the bottom of the singletrack descent, take stock of your will power. The climb up to Miller Rock is a doozie, and don't forget you'll be climbing back out to the trailhead. Miller Rock is well worth it, though, with some of the best views of the Continental Divide around. Local lore has it that a man named Miller took refuge on the rock after a lynch mob came after him for stealing a horse (think about how bikers feel about bike thieves). Miller, being such a smart thief, snuck on top of the rock where he waited the lynch mob out...until he starved to death the tale goes.

There are two ways to get up to Miller Rock, and they are both heinous. We recommend the counterclockwise loop as the hair-raising descent is super fun in that direction. Bring a map as the roads and trails get confusing around here. First you'll ride, push, and carry your bike uphill on a nasty jeep road that has degraded into fields of babyheads in places. Once you flatten out bear left at the second intersection and continue up the jeep road to the base of Miller Rock.

For a nice view and a sweet snack spot, get off your bike, walk around to the backside of the rock, and scramble up. Once you've had your fill of the expansive views, get back on your bike and continue on until you see a trail to the left (continuing straight takes you to private property). This singletrack descent goes from fast and flowy to downright death-defying. Have fun, but remember how far from civilization you are at this point. The pucker factor weeds a lot of people off this trail after the first attempt. Once you are safely at the bottom again, it's time to ride back up the creekside singletrack to the trailhead.

Local Trail Association
Boulder Mountainbike Alliance (bouldermountainbike.org)
Please consider joining or donating to the local riding association to support trail development & maintenance.
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Details

  • Riding area
  • Primary Activity
    Mountain Bike
  • Other Activities
    • Hike
    • Trail Running
    • Horse
    • Snowshoe
    • Nordic Ski
  • Difficulty rating
    Black Diamond
  • Route Type
    Loop
  • eBike Allowed
  • Bike type
    AM, XC
  • Direction
    Both Directions
  • Physical rating
    Hard
More Stats for Ceran St Vrain/Miller Rock Loop mountain bike route
  • Altitude min
    8,003 ft
  • Altitude start
    8,293 ft
  • Altitude end
    8,294 ft
  • Grade max
    -43.9%
  • Grade min
    52.5%
  • Distance climb
    3 miles
  • Distance down
    3 miles
  • Distance flat
    3,632 ft
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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
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  • Ideal
  • Dry
  • Very Dry
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  • Double Black Diamond

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  • Closed

  • Land Owner Overlay
  • Wilderness (typically no bikes in USA)
  • BLM (public)
  • USFS (Wildlife sanctuaries darker than usfs)
  • State land
  • Indigenous
  • Military
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
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  • eBike Charging Point eBike Charging Point
  • Water Fountain/Source Water Fountain/Source
  • Gate Gate
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Ladder Ladder
  • Stairs Stairs
  • Bridge Bridge
  • Camping Camping
  • Cabin Cabin
  • Lodge Lodge
  • Bear Cache Bear Cache
  • Dock Dock
  • Ranger Station Ranger Station
  • Summit Summit
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      Recent Trail Reports Along Route

      statustraildateconditiondescription
      Ceran Saint Vrain Trail
      May 20, 2019 @ 9:59am
      May 20, 2019
      more reports »
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