Registration is closed
Registration opens
August 8, 2021 5:00 PM
Registration is open until
August 30, 2021
Register Now!

Registered runners will not be charged until 60 days before the race when you will receive an email asking you to confirm your registration (you currently show up as “wait list” on UltraSignup). When you confirm, your credit card will be charged, if not you will simply be dropped off the wait list without charge.

The fire damaged trails have been cleared, the Covid protocols in place and the Children of the Vineyard Workers Scholarship Fund is going to be in good shape this fall thanks to your registration fees for the Lake Sonoma Series Races.

See you in Wine Country very soon!

Keira Henninger
Race Director, Lake Sonoma 100K​

Sunday, September 5, 2021
November 6, 2021

3333 Skaggs Spring Road
Geyersville, CA 95441

Google Map Link: Click here

Healdsburg Running Company

333 Center Street
Healdsburg CA 95448

from 5:15 on race morning

Download the 2021 Athlete Guide Here.

Course Aid Stations

  1. Island View- Mile 6.7 - Water only
  2. Warm Springs - Mile 14.0 - Full aid, drop bags, and crew access
  3. Wulfow - MIle 19.4 - Water and ice only
  4. Madrone - Mile 22.1 - Full aid and crew access
  5. Lone Rock - Mile 28.1 - Full aid, drop bags, and crew access - Cut off is 12:30pm
  6. Lone Rock Return - Mile 35.2 - Full aid, drop bags, and crew access - Cut off is 2:30pm
  7. Little Flat - Mile 37.7 - Water, Ice, Electrolyte, and Gels only
  8. Madrone - Mile 42.7 - Full aid and crew access - Cut off is 5pm
  9. Wulfow- Mile 45.4 - Water and ice only
  10. Warm Springs - Mile 50.8 - Full aid, drop bags, and crew access - Cut off is 7:15pm
  11. Island View - Mile 58.1 - Water Only

100k

Start time

Other Details

Rules

1. NO LITTERING. Zero, zip, nada. Carry it in, carry it out.

2. BE NICE. Be nice to each other, be nice to the volunteers, be nice to other trail users.

3. HAVE FUN! Violation of rules 1 and 2 will get you disqualified.

If you are observed violating rule 3 (i.e., not having fun) we may withhold your post-race beer.

Pacers are not allowed due to the difficulty of providing adequate aid. C’mon, you can run 100k without a pacer!​ No trekking poles.

Anti-doping Policy

The Lake Sonoma 100k has a zero-tolerance policy regarding the use of performance enhancing drugs (PEDs). Any athlete who has been determined to have violated anti-doping rules or policies, whether enforced by the IAAF, the World Anti-Doping Agency (WADA), U.S. Anti-Doping Agency (USADA), or any other national sports federation is ineligible for entry into the Lake Sonoma 100k.​

The Lake Sonoma 100k reserves the right to conduct pre- and post-competition testing for any and all performance-enhancing drugs (PEDs) listed on the current WADA Prohibited List. Any athlete who refuses to submit to anti-doping controls, if selected for testing, shall be disqualified and subject to a lifetime ban from the Lake Sonoma 100k.

Directions to the Start

3333 Skaggs Spring Road
Geyersville, CA 95441

Google Map Link: Click here

Note: it is a good idea to get gas the day before the race as there are no gas stations near the course.

From points south:

take Highway 101 north to the Dry Creek Road exit in Healdsburg (65 miles north of the Golden Gate Bridge). Upon exiting, turn left and follow Dry Creek Road for 10 miles. At the end of Dry Creek Road just below the Warm Springs Dam, turn left into the Warm Springs recreation area. Look for my signs, and blinking lights on the road. My parking volunteers will direct you where to park.

From Cloverdale and points north:

take Highway 101 south to the Dutcher Creek Road exit. Turn right upon exiting and then immediately left onto Dutcher Creek Road and follow it for 4.1 miles to Dry Creek Road. Turn right on Dry Creek Road and follow it for 1.1 miles. At the end of Dry Creek Road just below the Warm Springs Dam, turn left into the Warm Springs recreation area. Look for my signs, and blinking lights on the road. My parking volunteers will direct you where to park.

Directions to the Finish Line

The start and finish line of the 100k are two miles apart. We will have shuttles running all day and night to take you back to your cars once you finish:

Note: it is a good idea to get gas the day before the race as there are no gas stations near the course.

Finish Line- From points south:

take Highway 101 north to the Dry Creek Road exit in Healdsburg (65 miles north of the Golden Gate Bridge). Upon exiting, turn left and follow Dry Creek Road for 10 miles. At the end of Dry Creek Road just below the Warm Springs Dam, the road bends sharply left and becomes Stewart Point-Skaggs Springs Road. Follow this for another 1.9 miles and turn left to continue on Stewart Point-Skaggs Springs Road (straight ahead at this point becomes Rockpile Road). Follow for another 0.5 miles and the South Lake Trailhead parking lot is on your right at 100 Marina Road Lot A.

Finish Line- From Cloverdale and points north:

take Highway 101 south to the Dutcher Creek Road exit. Turn right upon exiting and then immediately left onto Dutcher Creek Road and follow it for 4.1 miles to Dry Creek Road. Turn right on Dry Creek Road and follow it for 1.1 miles. At the end of Dry Creek Road just below the Warm Springs Dam, the road bends sharply left and becomes Stewart Point-Skaggs Springs Road. Follow this for another 1.9 miles and turn left to continue on Stewart Point-Skaggs Springs Road (straight ahead at this point becomes Rockpile Road). Follow for another 0.5 miles and the South Lake Trailhead parking lot is on your right.

Crew Driving Directions

From the start to Warm Springs Creek: Google Map

Driving directions: Return to Stewart Point-Skaggs Springs Road. Turn right and follow it for 11 miles to the intersection of Old Skaggs Springs Road. Turn right on Old Skaggs Springs Road and follow it for 3 miles to the gate. (Note that this entire 14 miles is on a very scenic country road that twists and turns. If you are prone to car sickness this might possibly be an issue.) Park here and walk a half-mile further down the road to the aid station.

From Warm Springs Creek to Liberty Glen (Madrone Point): Google Map

Driving directions: Return up Old Skaggs Springs Road for 3 miles to the stop sign. Turn left onto Stewart Point-Skaggs Springs Road and follow it for 11.5 miles to the stop sign at Rockpile Road. Turn left and follow Rockpile Road for 3.2 miles to the Liberty Glen Campground Road. Turn left and follow this for 0.5 miles.

After the entrance station, turn left and follow the road to the Group Campground E. Park here and walk about 200 yards up the service road to the top of the hill where the course comes in. The Madrone Point aid station is another mile down the service road but you can crew your runner from this spot. Allow 45 minutes to drive here from Warm Springs Creek.

From Liberty Glen (Madrone Point) to Lone Rock (you will see your runners here at mile 24 and 31): Google Map

Driving Directions: Return to your car, and exit back out to Rockpile Road. Go right, and drive a short distance until you see the aid station on your left set up in the big dirt lot.  

Travel & Lodging Information

Lodging

Lodging in wine country is expensive and books up early. Do not delay in booking your room! The Healdsburg Visitors Bureau has a useful website which will show you availability and pricing for most places nearby. Here’s a list of a few, click on each to go to that hotel’s website:

Budget:
Super 8, Cloverdale
Cloverdale Wine Country Inn & Suites
L&M Hotel, Healdsburg
The Sandman Hotel, Santa Rosa
Fairview Inn & Suites, Healdsburg CA

Moderate
Hotel Trio, Healdsburg
Wine Country Travelodge, Healdsburg
Best Western Dry Creek Inn, Healdsburg
Hilton Garden Inn, Santa Rosa Airport
WorldMark, Windsor
Holiday Inn Express, Windsor
Hampton Inn, Windsor
Geyserville Inn, Geyserville
Camellia Inn, Healdsburg
Wildhaven Sonoma Glamping

Expensive
Grape Leaf Inn, Healdsburg
Calderwood Inn, Healdsburg
Vintner’s Inn, Santa Rosa
Healdsburg Inn on the Plaza, Healdsburg
Haydon Street Inn, Healdsburg
Madrona Manor, Healdsburg

Very Expensive
Hotel Healdsburg, Healdsburg
H2 Hotel, Healdsburg
Two Thirty-Five Suites, Healdsburg
Duchamp Hotel, Healdsburg
Hotel Les Mars, Healdsburg
Harmon House, Healdsburg
Hotel Vinea, Healdsburg
Flamingo Resort – Hotel, Santa Rosa
La Quinta Inn & Suites by Wyndham, Santa Rosa
AC Hotel by Marriot, Santa Rosa
Wilson Artisan Lodging
Hyatt Regency Sonoma Wine Country

Camping:
The Liberty Glen Campground, located near the 20-mile mark of the run, has 97 campsites. You must reserve at least two days in advance through recreation.gov or by calling (877) 444-6777.

The private marina has several campsites that are less than half a mile from the start/finish.
​Call (707) 433-2200 to reserve a site.

Past Race Results

Sponsors

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Safe Socially-Distant Racing

We make sure to provide safe and effective racing protocols ensure your health and safety.
Download our Covid-19 Guidelines

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