Lake Sonoma 100K, 50K & Trail Sisters Half Marathon

Apr 11, 2026Geyserville, CA, United States

External Event

Distance

13.1–62.1 mi

Pace

Varied

Terrain

Trail

Difficulty

Challenging

About this run

The Lake Sonoma 100K, 50K & Trail Sisters Half Marathon is set for April 11, 2026, in Geyserville, California. This event offers distances from 21.1 km to 100 km. Expect a demanding trail running experience.

What to expect

Multiple distances including 50K and 100K
Trail running through scenic areas
Check the official site for course details

Typical conditions

For events around April 2026 in Geyserville, CA, United States: Typical spring conditions in this region — mornings can still be cool; confirm start-time guidance on the official page.

How to prepare

Trail events reward time on uneven surfaces and hills. Practice footing and bring the shoes and hydration the organizer recommends — details vary by race.

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Getting there

This event is listed in Geyserville, CA, United States. Confirm the exact start venue, parking, and transit options on the official registration page.

External Event

Registration is handled by the official event organizer

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