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Official entry
Entries openVerified
Verified Sat, 10 Oct 2026
Enter officiallyEventsFind this location on a map 3 editions
USARunningTrail100.5mi · 161.7 km / 100.5 mi12mi · 19.3 km / 12.0 mi26.8mi · 43.1 km / 26.8 mi51.5mi · 82.9 km / 51.5 mi77K · 77 km / 47.8 mi80.9K · 80.9 km / 50.3 mi
Sonoma Fall Classic — Lake Sonoma
Geyserville, California, Lake Sonoma Recreation Area · USA
Next race day
Sat, 17 Oct 2026
4 distances · see start times below
About Sonoma Fall Classic — Lake Sonoma
Sonoma Fall Classic — Lake Sonoma is a running event in Geyserville, California, Lake Sonoma Recreation Area, United States. Recorded disciplines include 100.5mi, 12mi, 26.8mi, 51.5mi, 77K, 80.9K. The listed surface is trail. The listed organiser is Aravaipa Running / Healdsburg Running Company. The next listed date is 17 October 2026. Check the organiser's information for entry and race-day arrangements. The ATHRECS archive includes editions from 2019 to 2025. This describes the editions recorded here, not the event's founding date or complete history.
Dates, starts & entry
Times are local to the race. Select the entry route for your distance.
- Official entry
12mi · 19.3 km / 12.0 mi
Sat, 17 Oct 2026
Starts 10:00 PDT
Entries open
Half Marathon: organiser course length 12 miles; start at Liberty Glen Campground. All finish at Lake Sonoma Recreation Area.
Edition source - Official entry
26.8mi · 43.1 km / 26.8 mi
Sat, 17 Oct 2026
Starts 08:00 PDT
Entries open
Sonoma Trail Marathon: organiser course length 26.8 miles; start at Lake Sonoma Recreation Area. All finish at Lake Sonoma Recreation Area.
Edition source - Official entry
51.5mi · 82.9 km / 51.5 mi
Sat, 17 Oct 2026
Starts 06:30 PDT
Entries open
Lake Sonoma 50 Mile: organiser course length 51.5 miles; start at the Ranch at Lake Sonoma / South Lake Trailhead. All finish at Lake Sonoma Recreation Area.
Edition source - Official entry
100.5mi · 161.7 km / 100.5 mi
Sat, 17 Oct 2026
Starts 05:00 PDT
Entries open
100 Mile Sufferfest: organiser course length 100.5 miles; start at Lake Sonoma Recreation Area. All finish at Lake Sonoma Recreation Area.
Edition source
Location & race day
Listed venue / area
Lake Sonoma Recreation Area, Geyserville, CaliforniaUSA
Confirm the exact start line, parking and arrival instructions with the organiser. A listed town or postcode may cover a wider area.
About the race
The Lake Sonoma trail programme now held in autumn, with long ultras and shorter routes around the lake and surrounding hills.
- Surface:
- Trail
- Organiser:
- Aravaipa Running / Healdsburg Running Company
Ways to enter
Compare the listed booking routes. Verified links show when they were checked.
Sat, 17 Oct 2026
Third-party prices, booking fees, allocations and refund terms can differ. Confirm the final details with the provider before paying.
Results
Public-figure or athlete-approved ATHRECS results, plus verified organiser links.
Sun, 13 Apr 2025
80.9K · 80.9 km / 50.3 mi
Sat, 9 Apr 2022
80.9K · 80.9 km / 50.3 mi
Sat, 13 Apr 2019
77K · 77 km / 47.8 mi
Past races
80.9K · 80.9 km / 50.3 miFinishedResults
Sun, 13 Apr 2025
Historical UTMB source record. Trail classification provisional. Ascent 3200 m. UTMB Index category 100K is not the course distance.
80.9K · 80.9 km / 50.3 miFinishedResults
Sat, 9 Apr 2022
Historical UTMB source record. Trail classification provisional. Ascent 3200 m. UTMB Index category 100K is not the course distance.
77K · 77 km / 47.8 miFinishedResults
Sat, 13 Apr 2019
Historical UTMB source record. Trail classification provisional. Ascent 3080 m. UTMB Index category 100K is not the course distance.
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