Registration on UltraSignup closes Oct. 12, 2026 at 11:59 p.m. MT; the prices shown hold until then, and a higher race week price is also listed. Prices exclude tax and UltraSignup fees. Relay teams have four runners.
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| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| 100 Mile | 100 Mile | Oct 17, 20265:00 AM | $435 | – |
| 100 Mile Relay (4 person) | Relay | Oct 17, 20265:00 AM | $420 | – |
| 50 Mile Relay (4 person) | Relay | Oct 17, 20265:00 AM | $320 | – |
| Lake Sonoma 50 Mile | 50 Mile | Oct 17, 20266:30 AM | $235 | – |
| Sonoma Trail Marathon | Marathon | Oct 17, 20268:00 AM | $175 | – |
| Half Marathon | Half Marathon | Oct 17, 202610:00 AM | See registration | – |
Fees and dates are from the race's official website on the date shown below; confirm them there before you register.
Sunrise on race morning is at about 7:22 AM, and the 100 Mile starts at 5:00 AM.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
Lake Sonoma Recreation Area, 3227 Stewarts Point-Skaggs Springs Rd (finish for all races; the 50 mile and half start elsewhere), Geyserville, CA 95441
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
What runners should know about Sonoma Fall Classic, in brief, from the official race website.
Schedule and packet pickup
Bibs are handed out Friday, Oct. 16 at Healdsburg Running Company, 333 Center St in Healdsburg. The 100 mile and marathon start at the Lake Sonoma Recreation Area, the 50 mile at The Ranch at Lake Sonoma, and the half at Liberty Glen campground. All races finish at the recreation area.
Course
The 100 mile runs two 50 mile laps, gains about 25,058 ft and has a 36 hour limit, opening with a climb of Pritchett Peaks. The 50 mile starts at South Lake Trailhead, gains about 10,612 ft and has a 16 hour limit. The marathon is the classic lake loop (11 hours); the half runs point to point, mostly downhill.
Parking and travel
Camping on site is free with a form on the race site. After the race, shuttles run from the finish back to the remote start areas.
Rules and FAQ
Crews may meet runners at the start/finish, Warm Springs, Liberty Glen and Lone Rock; there are no gas stations near the course. 100 mile runners may have one pacer after mile 50 or after dark. The 50 mile, marathon, half and relays allow no pacers.
Facts on this page come from the race's official website (aravaiparunning.com/california-races/sonoma, aravaiparunning.com/races), checked Sep 28, 2026. Confirm dates and fees there before you travel.
Organize this race? Add details or a correction
A new fall trail festival at Lake Sonoma in wine country, where the Lake Sonoma 50 Mile has moved and been joined by a 100 miler, a trail marathon, a half and four person relays. Aravaipa Running puts it on with Healdsburg Running Company and Tropical John Medinger, with free camping on site.