4 miles
113 ft
-114 ft
Avg time


  • Activities
    • Mountain Bike
    • Dirtbike
  • Riding Area
    Guam International Raceway
    Guam, Armed Forces Pacific
  • Difficulty Rating
  • Trail Type
  • Bike Type
    DH, XC
  • Trail Usage
  • Direction
    One Direction
  • Climb Difficulty
  • Physical Rating
  • Trail Visibility
    Sometimes hard to follow
  • Dogs Allowed
  • Ride in Rain
  • Local Popularity
    65 in Mountain Biking [+]
    • 5 in Dirtbiking
    • 5 in ATVing/Offroading

The great thing about this trail is it is rideable year-round. Most of the remaining MTB trails on the island are unrideable during the rainy season due to the abundance of red dirt/clay surface that turns to thick, rust-colored mud that clogs up the rear triangles on your frame preventing the tires from clearing. There is a beautiful photo viewpoint of the eastern coastal area - perfect to take selfies and to take a breather

The trail starts out on part of the off-road track. It is shared with an ATV tour vendor that is a tenant at the raceway. As such, bikers have to follow the trail in the same direction that the ATV tours go - counter clockwise.

After the first climb, then there is a fast descent with a couple of nice bumps to get some air. Then you take a side doubletrack trail that takes you onto the jungle-covered jeep trail. It's rocky, but not technical, and includes a couple of nice rollers. There is one short punchy climb after which you have a choice of an A-line (for riders with a bit more bike handling skills), and the B-line (easier but takes a longer route) that drops into a nice quarry.

Some nice singletrack follow and then you loop back to the start.

All the doubletrack on this trail is a shared with an ATV tour operator. The singletrack is only for bikes. The whole park is primarily for motorized sports (moto-x, off-road races) and there is a go-kart track and quarter-mile drag strip on the west side of the park. Plenty of parking.

Access Info Restricted Access

Currently, only members of the Guam Cycling Federation, Guam Motorcross Association, and Guam Racing Federation are allowed on the trails. An annual membership for the Guam Cycling Federation is $60 and can be done online at guamcycling.com. Hours of operation are 8am - 530pm, Tues/Thu/Fri/Sat/Sun.

Traditionally Indigenous Territory
More Stats for Guam Raceway Park (GRP) Loop bike trail trail
  • Altitude change
    -2 ft
  • Altitude min
    488 ft
  • Altitude max
    555 ft
  • Altitude start
    531 ft
  • Altitude end
    528 ft
  • Grade max
  • Grade min
  • Distance climb
    1 mile
  • Distance down
    1 mile
  • Distance flat
    4,934 ft
  • Avg time
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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail Ridden Direction
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The colour categories are based on what percentage of riders are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
Trail Last Ridden
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  • < 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 ridelogs 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 rides = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular
Max Vehicle Width

Radar Time
Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
  • Black
  • Double Black Diamond

Trail Report Status
  • Clear / Green
  • Minor Issue / Yellow
  • Significant Issue / Amber
  • 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
  • Map Markers
  • trail Trail Head
  • photo Photo
  • place Directory Listing
  • region Riding Area
  • Parking Parking
  • Viewpoint Viewpoint
  • Information Information
  • Warning Warning
  • Directions Directions
  • Sight Sight
  • Restrooms Restrooms
  • 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
  • Boardwalk Boardwalk
  • Camping Camping
  • Cabin Cabin
  • Lodge Lodge
  • Bear Cache Bear Cache
  • Dock Dock
  • Ranger Station Ranger Station
  • Summit Summit
  • Other Other
      Directions to guam-raceway-park-grp-loop trailhead (13.505250, 144.885930)
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      6 Months
      • 2 rides
      • 5 miles avg distance
      • 1 rides


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