32.7 miles
4,447 ft
-5,114 ft
1,670 ft
High Point

Version 2 for more continuity

This route is Unsanctioned, Ride at your own Risk!

Detailed Description
Bolinas_SG v2 is a 33 mile moderately popular easy unsanctioned route located near Tamarancho / West Marin / North Tam California. This mountain bike only route. This route includes 3 trails. This route climbs 4,447 ft with a max elevation of 1,670 ft then descends -5,114 ft.

Trail Products

14 Reviews & Comments

  • + 0
Redrob650 (Oct 15, 2022 at 17:34)
Trail Bill's Trail
There are sawed logs every quarter mile or so that you have to zig zag. One is around a blind turn and extremely dangerous. It almost launched me off the hillside. I had to skid out last minute and slammed my gears into the side of it. This trail is pretty boring in general so won’t be riding it again.
  • + 0
Jefferberg8 (Jul 8, 2022 at 19:44)
Trail Bill's Trail
The fallen tree was still down but manageable to get by without any issues. A little overgrown with poison oak in some spots but otherwise in good condition.

I did as an out-and-back. Good climbing and a long flowy decent, fun with some speed but nothing technical to deal with.
  • + 0
hellomihai (Feb 13, 2022 at 10:38)
Trail Bill's Trail
Good ride. Only one fallen tree blocking the path but can be crossed with a little effort.
  • + 0
Ericofg (Jan 30, 2022 at 19:30)
The part of the trail closer to Bofax is great, the part close to Olema is super bumpy and not the most fun to ride now, but the views are still amazing
  • + 0
Ericofg (Jan 30, 2022 at 19:29)
Trail Jewell Trail
The soil marked by the cows is super bumpy
  • + 0
MtbSince84 (Dec 20, 2020 at 21:26)
Trail Bill's Trail
Closed for the rainy season as of this weekend. Locked gates at both ends of trail.
  • + 1
Millerwill (Dec 14, 2020 at 19:28)
Trail Bill's Trail
Bill's Trail is CLOSED UNTIL APRIL 2021. Effective 12.14.20
  • + 1
tofudog (Oct 13, 2020 at 13:22)
Trail Bill's Trail
Concur that this trail is fantastic and meticulously maintained. Nice, easy going grade, well-shaded. Despite the fire road leading to the trail head being super dry and loose, Bill's Trail is just moist enough to provide excellent traction.
  • + 0
mchoffmann (Aug 5, 2020 at 10:29)
Trail Bill's Trail
This is a super nice trail in perfect condition. Thanks to everyone who made this happen. I would recommend doing this trail uphill since it is nicely shaded almost all the way and not steep. Perfectly doable on a gravel bike as well.
  • + 0
Tonymosa (May 20, 2020 at 21:51)
Trail Bill's Trail
Double bonus points to all that made this happen!
  • + 0
Macman87 (May 3, 2020 at 0:59)
Trail Bill's Trail
Is it better to ride up or down Bill’s Trail?
  • + 1
MtbSince84 (Dec 7, 2020 at 8:35)
Trail Bill's Trail
I rode both up and down it yesterday. It was great in both directions: gradual grade, smooth surface. I have not ridden the alternative, Barnabe Fire Road, but its description calls it "primarily downhill", so I'm assuming it has some (typical for Marin) very steep grades. So: consider riding both up and down on Bill's trail, or if you want to ride down a different way than you rode up, try riding up Bill's and down Barnabe Fire.
  • + 1
Bro-tato (Apr 25, 2020 at 16:49)
Trail Bill's Trail
Bill’s Trail is fully open to bikes now! And all fallen trees have been removed
  • + 1
Chipmsmith (May 4, 2017 at 13:36)
Trail Bill's Trail
Bills trail is closed from Fallon trees that are uncrossable even on foot. It is way overgrown and covered in poison oak. Don't ride or hike it!

Trails in Route


More Stats for Bolinas_SG v2 mountain bike route
  • Altitude change
    -667 ft
  • Altitude min
    117 ft
  • Altitude start
    1,467 ft
  • Altitude end
    801 ft
  • Grade
  • Grade max
  • Grade min
  • Distance climb
    14 miles
  • Distance down
    17 miles
  • Distance flat
    2 miles
Avg: 3 (1 votes)
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Snow Cover Inadequate
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
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Recent Trail Reports Along Route

Bill's Trail
Dec 27, 2022 @ 11:37am
Dec 27, 2022
Jewell Trail
Aug 24, 2022 @ 3:53pm
Aug 24, 2022
What @Spindelatron said
Devil's Gulch Fire Road
Jan 30, 2022 @ 2:18pm
Jan 30, 2022
The trail cuts through Devil’s Gulch Farms for a tiny stretch, and sometimes the gates are locked, and the owner’s not happy to have visitors…
more reports »
  • By mkoved & contributors
  • #29368 - 181 views