A REALLY TOUGH Mountain Bike Race










The Mother of all Singletrack

This event is not a joke. It is a true test of your fitness in every sense. Lake Sonoma is a very rugged place with the terrain to match. Isolation is a regular condition out there, so be safe and try to silence the nagging voices in your head. In short: if you’re considering entering this event, you should be training for it.

Choose from 3 routes!

The Boar's Tusk

35 Miles, 7,000'

Feral Pig

25 Miles, 5,000'

Rain Alternate

In poorer conditions, this will be the alternate route for both Boar's Tusk and Feral Pig. Both routes would be combined. Feral Pig participants would be scored as "Sport" riders, and Boar's Tusk would be scored as "Expert". No change for "Little Piggy".

27 Miles, 5,500'

Little Piggy (Non-Timed)

15 Miles, 2,700'

Rest stops are as follows:

BOAR'S TUSK: 8mi (full), 16mi (self-service), 21mi (full), 29mi (full)

FERAL PIG: 7mi (self-service), 12mi (full), 20mi (full) 

LITTLE PIGGY: 8mi (basic)

“Basic” stops include water, gels, hydration mix and bars.

“Full” stops include water, gels, hydration mix, a bottle feed and simple food such as fruits and salty snacks. Bottle feeds are limited to one bottle.


Pro Men: 35 Miles
Pro Women: 35 Miles

Open Singlespeed: 35 Miles

All other entries regardless of route compete by age brackets and gender.

"Little Piggy" is a non-competitive category.


Our sponsors are generous folks, and you can rest assured that in addition to having a chance of taking home one of our beautiful medals at the podium, there will be a great big mountain of prizes from our sponsors to get through.


If you are already registered but unable to make it, you can transfer your entry. Send us an email with the name and email address of the rider taking your spot before the Wednesday, before the race. Last minute transfers (after Wednesday) will generate a $20 late transfer fee.

About the Route

The long route is 34.5 challenging miles of steep terrain with whippy turns, and foot-out off-camber descents. It's for the rowdiest of mountain bikers. The climbs are short, steep, and come at you constantly. The descents are of a similar character. There are very few long climbs to set into and just as few long descents to use to get around all those people who passed you on the climbs. Expect to pedal, and if you are racing in the singlespeed category, opt for an easier gear ratio.

The medium route includes mos of the challenging stuff but excludes the first offroad section and instead continues for 2.5 miles on pavement until re-joining with the long route. It also takes a shortcut between the Liberty Glen aid station and the Wulfow Shortcut aid station meaning that for those riding the "Feral Pig". Note: The "Wulfow Shortcut" aid station will only be in place for long-course riders. So if you need something on the medium route, get it at Liberty Glen!

The short course only stops at the Liberty Glen station and then turns off on to additional single track not laid out in the profile below. Remember, the short-course is a non-competitive (not timed) route.



Though there is not an official camping area, our permit allows riders to camp at Warm Springs and Liberty Glen Recreation Areas.  Just bring either your rider packet, or your confirmation email.  

5:00 - 7:00 pm — Packet pickup at Bike Monkey HQ (121 5th Street in Santa Rosa)


Everything is happening at Warm Springs Recreation Area.

7:00 am — Packet pickup and on site registration open
9:00 am — Mass start
2:30 pm — Awards

Past Results

2013 | 2015 | 2016 | 2017

Registered Riders

City / State
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Register for SoNoMas

Registration for SoNoMas opens on January 1st and is $79 per rider ($59 for the Little Piggy). For that you get stocked and staffed aid stations, a categorized competitive race environment on well-marked and technically demanding singletrack, a traffic-controlled mass-start, an amazing prize list, cash payouts for pro racers and a huge post-race meal to bring you back from whatever cave you found yourself in.


35 Mile Route: $81 | 25 Mile Route: $71 | 14 Mile Non-Competitive Route: $35.

Like the shirt? You have until Thursday, October 24th 11:59 pm to add it to your registration!

Click here for group buys.