USARunningTrail (provisional)50K · 50 km / 31.1 mi

TERREX Lake Sonoma 100k, 50k and Trail Sisters Half Marathon — 50K

Location to be confirmed · USA

No future date listed

About TERREX Lake Sonoma 100k, 50k and Trail Sisters Half Marathon — 50K

TERREX Lake Sonoma 100k, 50k and Trail Sisters Half Marathon — 50K is a running event in United States. Recorded disciplines include 50K. The listed surface is trail (provisional). No future date is currently listed on ATHRECS. The ATHRECS archive includes editions from 2026. This describes the editions recorded here, not the event's founding date or complete history.

50K results · Sun, 12 Apr 2026

Recorded performances from TERREX Lake Sonoma 100k, 50k and Trail Sisters Half Marathon — 50K in United States. This is a partial results archive; it does not represent the full field.

Robbie Simpson · 3:39:39 · Results: UTMB Index public profile (18–19 September 2026 snapshots)

View recorded results

Athlete profiles

Explore some of the athletes with recorded results at TERREX Lake Sonoma 100k, 50k and Trail Sisters Half Marathon — 50K.

Robbie Simpson

Dates, starts & entry

Times are local to the race. Select the entry route for your distance.

The next date has not been announced here. Check the race website for updates.

Location & race day

Listed venue / area

Location to be confirmedUSA

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

Historical course record. Trail classification is provisional, based on inclusion in the UTMB Index; course surface has not been independently verified. Actual course distances are retained separately from UTMB Index categories.