22.0 miles
Distance
4,743 ft
Climb
-4,746 ft
Descent
4,623 ft
High Point
-3 ft
Altitude change
1,810 ft
Altitude min
1,821 ft
Altitude start
1,818 ft
Altitude end
-101.6%
Grade max
58.2%
Grade min
13 miles
Distance climb
7 miles
Distance down
2 miles
Distance flat

This route takes your thru the scenic singletrack below the Sawtooth ridge. You'll get a chance to swim in Granite and Bertha May lakes and taste plenty of blueberries. Lots of steep climbing but the final descent down Osbourne mt is worth it. It's fast and flowy.

Note that the road portion can alternatively be done in CCW direction by leaving the campground and turning left, then using FS 85 and 84 to get to the same starting point as the map shows. The CCW route is more shaded and lower traffic while climbing to just a bit higher point.

Detailed Description
Osborne Mt full loop is a 22 mile moderately popular expert route located near Packwood Washington. This mountain bike only route can be used one direction and has a hard overall physical rating. This route includes 2 trails. This route climbs 4,743 ft with a max elevation of 4,623 ft then descends -4,746 ft.
Tags

Local Trail Association

Local trail association
Evergreen - Cowlitz-Naches Chapter (www.evergreenmtb.org)
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Stats

  • Distance
    22 miles
  • Avg time
    3 hr 50 min
  • Altitude min
    1,810 ft
  • Altitude start
    1,821 ft
  • Altitude end
    1,818 ft
  • Climb
    4,743 ft
  • Descent
    -4,746 ft
  • Grade max
    -101.6%
  • Grade min
    58.2%
  • Distance climb
    13 miles
  • Distance down
    7 miles
  • Distance flat
    2 miles

3 Reviews & Comments

JLantz
12mi approach road is fine. Middle traverse section from 12mi to the Osborne Mt saddle at 18mi is in terrible shape and was a total slog with lots of hike-a-bike and blowdowns. Downhill from the saddle at 18mi was awesome.

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Details

  • Riding area
  • Primary Activity
    Mountain Bike
  • Difficulty rating
    Black Diamond
  • Route Type
    Loop
  • eBike Allowed
  • Bike type
    AM, XC
  • Direction
    One Direction
  • Physical rating
    Hard
  • Activity Logs
    6
Avg: 3.35 (3 votes)
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Trail transparency
  • Singletrack
  • Unpaved

Recent Trail Reports Along Route

statustraildateconditiondescription
Osborne Mountain Trail
Jul 17, 2026 @ 5:59pm (America/Los_Angeles)
Jul 17, 2026
No trees down. Great dirt after the July 16 rain. A little brushy in a few spots at the top, but nothing note worthy compared to the rest of the loop.
more reports »
  • By i-g-o-rTF Pro & contributors
  • #9422 - 2,932 views

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