Lake Sonoma 100K, 50K, TS Half Marathon – Geyserville, CA 2026

Date
April 11, 2026
Location
Geyserville, CA
Venue
3227 Stewarts Point-Skaggs Springs Rd
Start Time
9:30 AM
Entry Fee
$110.00 – $280.00
Events
Trail Sisters Women's Half Marathon, Lake Sonoma 100K, Lake Sonoma 50K
Register NowRegistration OpenOfficial Race Website

Lake Sonoma 100K, 50K, and Half Marathon takes place at 3227 Stewarts Point-Skaggs Springs Road in Geyserville, California on April 11, 2026. The event offers three trail running distances: a 100K ultra, 50K ultra, and half marathon, accommodating runners across different experience levels. The race starts at 9:30 AM. Entry fees range from $110 to $280 depending on the distance selected. This is a trail-based event in Sonoma County wine country, providing runners with an established ultramarathon and shorter trail options for those targeting spring race goals.

From the Race Organizer
Join us in Healdsburg, California, on April 11th 2026 for the TERREX Lake Sonoma 100K, 50K, and Trail Sisters Half Marathon! We are excited to have adidas TERREX back as our presenting partner! We are stoked to team up with Mountain Outpost to bring you full livestream coverage, athlete panels, interviews, and commentary from special guests! Lake Sonoma 100K The 100K course will start with a climb up Pritchett Peak with a water only stop at the top. Once you reach the summit you’ll head back down toward the Lake Sonoma Visitors Center and then up to the hill to South Lake Trailhead where you’ll embark on an out and back of the original old school LS course and then back down the hill to the finish. It’s the same great Lake Sonoma Relentless experience, only this time with a big climb to kick it all off! Lake Sonoma 50K It’s not worth it unless you have to work for it! The 50k start is located in the green space next to the Lake Sonoma Visitor Center (you can’t miss it). After a short r

Hotels Near This Race

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Lake Sonoma 100K, 50K, TS Half Marathon – Geyserville, CA 2026

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Race Travel Insurance

Don't forget travel insurance for April 11.

You've trained for months and booked a trip to Geyserville, CA. A pre-race injury, a delayed flight, or a family emergency can derail the whole thing. Travel insurance can help cover your race entry fee, hotel, and flights if you can't make it, and may cover medical costs if something goes wrong on the course. Plans typically only run 5-7% of your total trip cost — and running events are covered under standard plans with no additional coverage needed.

  • Trip cancellation up to 100% of prepaid costs
  • Running events covered under standard plans — no add-ons needed
  • Trip interruption up to 150% of non-refundable costs
  • Emergency medical up to $250,000
  • Cancel For Any Reason add-on available
  • 24/7 real-time support
Get a Quote — Faye Travel Insurance

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Frequently Asked Questions

When is Lake Sonoma 100K, 50K, TS Half Marathon – Geyserville, CA 2026?

Lake Sonoma 100K, 50K, TS Half Marathon – Geyserville, CA 2026 takes place on April 11, 2026. The race is held in Geyserville, California.

Where is Lake Sonoma 100K, 50K, TS Half Marathon – Geyserville, CA 2026 held?

Lake Sonoma 100K, 50K, TS Half Marathon – Geyserville, CA 2026 is held at 3227 Stewarts Point-Skaggs Springs Rd in Geyserville, California.

Where can I find hotels near Lake Sonoma 100K, 50K, TS Half Marathon – Geyserville, CA 2026?

RaceHotelFinder shows hotels sorted by distance from the race venue in Geyserville. Use the map or list view on this page to compare options and book race weekend accommodation.