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DISTANCE
50 Miles
ELEVATION GAIN
9,915 Feet
CUT OFF
14 Hours
START TIME
6:30am
It’s sneaky hard, so save something for the second half. The hills aren’t major, but they are relentless and take a toll…all while providing beautiful scenery along the way. There are three more major climbs throughout the middle of the course, which many runners choose to hike. If you’re wiped out, the last 12 miles can go on forever, so save some juice for the end and you will pick up a lot of places in the last two or three hours. The course is 98% trail and 2% road.
Skratch Labs Lemon Lime drink mix and orange and grape chews will be provided on course.
Lake Sonoma Elite
1ST PLACE
$1,250
2ND PLACE
$750
3RD PLACE
$500
Think you’re the fastest? Join the elite start fields and race for podium spots and the cash prizes. Lake Sonoma Elites will have a separate Men’s and Women’s start. We are excited to celebrate your speed and provide you a runway to a new course record! Complete the Elite Start form and join the elite start field.
Elite Entrants List
COME RACE WITH THE PARTY PACE(rs)!
New for 2025 we will have Party Pace(rs) who will be there along the way to help you make it to the finish! Pacers will aim for a 13 hour finish, leaving a one hour grace period before the official race cutoff. Come run your first 50 Miler at Lake Sonoma and we will do everything we can to get you to the finish!
Aid Station | Mile | Next Aid | Cut Off | Crew | Drop Bag |
|---|---|---|---|---|---|
South Lake | 2.4 | 4.5 | No | No | |
Island View | 6.9 | 7 | No | No | |
Warm Springs | 13.9 | 4.9 | Yes | Yes | |
Wulfow | 18.8 | 2.9 | No | No | |
Madrone | 21.7 | 4.2 | Yes | No | |
Lone Rock (@ bench) | 25.9 | 4.2 | 1:15 PM | Yes | Yes |
Madrone | 30.1 | 2.9 | Yes | No | |
Wulfow | 33 | 4.9 | No | No | |
Warm Springs | 37.9 | 7 | 4:45 PM | Yes | Yes |
Island View | 44.9 | 4.5 | 7:10 PM | No | No |
South Lake | 49.4 | 1.7 | No | No | |
Finish | 51.1 | 8:30 PM |
Runners who do not think they can finish the race should drop at Warm Springs, Madrone, or Lone Rock. Island View and Wulfow aid stations are not easily accessible and do not have staff to assist with shuttling runners back to the start/finish area.
Aid stations will be stocked with the normal ultra fare, and will have water and electrolyte drink. WE ARE A CUPLESS RACE!
Note: South Lake & Wulfow are water only aid stations.
Please monitor your fluid requirements carefully and note that there are fairly long stretches between aid. If it’s warm you will likely need more than one bottle in the afternoon. Every runner must carry at least one water bottle.
Drop Bags will be transported to the Lone Rock aid station and to Warm Springs Creek. Please try to limit the size of your drop bag to no larger than a small shoebox. We are happy to allow for drop bags, but not particularly interested in moving all your worldly possessions.
DNF Drops – We hope you don’t DNF, but if you need to drop from the race, you should drop at Warm Springs, Madrone, or Lone Rock. DO NOT DROP at Island View or Wulfow. These aid stations are not easily accessible and do not have staff to assist with shuttling runners back to the start/finish area.
Lake Sonoma 50, Marathon and Trail Sisters Half Marathon are owned and operated by Trail Sisters LLC. All Rights Reserved © 2025
Please complete all fields below. Additionally, you have the option to upload a race resume.
From the start to Warm Springs Creek (45 min): Return to Stewart Point-Skaggs Springs Road and head up the hill approx.1.75 miles. Turn/continue left on Skaggs Spring road. Follow it for 11.5 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 Madrone/Liberty Glen (55min): 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. Allow 45 minutes to drive here from Warm Springs Creek.
Madrone/Liberty Glen to Lone Rock (10 min): Return to your car, and drive back up the hill to Rockpile Road. Turn right and follow Rockpile Road for about a half mile back to the well-signed Lone Rock trailhead parking area Crew Parking Lot on your left. LOOK FOR “LOWER LOT” AND 50 MILE CREW SIGNS.
Walk down the access trail to cross Rock Pile road. The Lone Rock aid station is a 1/3 of a mile walk down the Half-A-Canoe trail at the bench. Be careful crossing Rockpile Road.
