Simple orange outline of a mountain range or peaks

Lake Sonoma MTB

October 24th, 2026 (Opens Feb. 1st, 2026) Register

The return of the Classic Lake Sonoma MTB Hopper. Traditionally we have held this race in the early Spring but with the seasonal high water and creek crossings it’s just not possible; so we’ve pivoted to a Special Event, stand alone race. This loop includes over 20 miles of narrow, swoopy and flowing single track. With a shark tooth profile you’re either going up, or down on a some of the best single track in NorCal.

Long Course

Audio waveform visualizer with orange peaks and valleys on a white background.

27mi

5504 ft

85%Single Track

Route

The Classic Lake Sonoma MTB

This single lap, epic loop has long been a fixture in the Grasshopper Adventure Series. With over 27 miles and 5500 ft of climbing you will be treated to some of the best, thrilling and most challenging xc trails in NorCal.

All Hopper routes are open and riders must obey all traffic laws and rules.

Long Course Route
 
A person riding a mountain bike on a dirt trail between large rocks, with green trees and blue sky in the background.

Friends of Lake Sonoma

The Friends of Lake Sonoma Foundation is committed to protecting the natural beauty, wildlife, and recreational opportunities of Lake Sonoma. Through conservation, education, and community support, we ensure the lake remains a cherished resource for generations to enjoy.

Redwood Trails Alliance

Redwood Trails Alliance works to build, maintain, and advocate for trails that connect people with nature throughout the North Bay. By fostering stewardship and collaboration, they create sustainable trail systems that inspire outdoor adventure and strengthen community bonds.

More Info

  • Tucked into the rolling hills of Sonoma County, Lake Sonoma is a rugged, scenic gem known for steep climbs, flowy singletrack, and epic lake views. Just 30 minutes from Healdsburg, this spot delivers a true NorCal MTB experience—raw, punchy, and rewarding. The terrain? A mix of twisty descents, rocky fire roads, and leg-burning climbs, all wrapped in classic wine country beauty.

  • Expect cool mornings and crisp air, with temps kicking off in the mid-40s before climbing into the low 60s by midday. Rain is always a wildcard this time of year, which means trails could be hero dirt or a little spicy—either way, it's all part of the fun. If the sun's out, expect short sleeves by noon, but don’t ditch that windbreaker just yet—Lake Sonoma’s ridge lines can bring sneaky gusts. Pack for all conditions and be ready to send it!

  • Saturday March 22nd, 2025

    7:00 AM - 8:45 AM: Registration/Packet Pickup
    8:45 AM - Staging/Rider meeting at start gantry
    9:00 AM Start:
    Start Times:

    • E-Bikes: 9:00 AM

    • All Age Groups and Pro: 9:10 AM

    • Short Course: 9:10 AM

    1:00 PM: Lunch Begins
    2:30: Podium

    • Registration opens October 7, 2025 and closes March 19th, 2025

    • Day-of registration is available if the event is not sold out and incurs an additional $20 fee on top of standard registration fee.

    • The deadline to transfer your registration to another rider is March 19th, 2025 at 11:59PM PST

  • Packet pick up will be the day of the event at the event venue from 7:00-8:45 AM

  • Grasshoppers have always been about adventure, exploration and pushing your limits. Come to race, or come to adventure and explore. Riders may choose their category and licenses are not required. All Hopper routes are open and riders must obey all traffic laws and rules. See RULES OF ENGAGEMENT

    Male: Pro, U19, 19-29, 30-39, 40-49, 50-59, 60+, Single Speed, E-Bike
    Female: Pro, U19, 19-29, 30-39, 40-49, 50-59, 60+, Single Speed, E-Bike
    Non-Binary

  • Theres is no official Lodging Partner for this event, however there are Hotels and Airbnb’s in area!

    • Camping is allowed Friday and Saturday. We have sites #1 and #2 at the Warm Springs Picnic Area. See MAP here.

    • Van Camping is permitted in the parking lot - Here

  • Lake Sonoma is a true cross-country ride, featuring a mix of technical climbs, descents, and fast sections. For this type of terrain, we recommend a lightweight and responsive bike like the Specialized Epic.

    Note: E-Bikes are permitted at this event if you register for the E-Bike Category

  • We’ve created a group page for riders. You can post if you are looking for an entry, looking to sell a spot, have questions about tires and road conditions, looking to ride share, camping/lodging etc. To join the group, go to Grasshopper Group. (Note: This is NOT the official Grasshopper Facebook page)

  • Long Course:
    Feedzone 1: Mile 8

    Feedzone 2: Mile 15

    Short Course:
    Feedzone is at mile 8

    Refrence course map POI’s for more information on location


    We’ll have water, Skratch hydration, nutrition, GU Energy, and snacks for you.

    Bottle Drop: If you wish to leave a bottle with your name clearly labeled on it you may leave it with the
    NorCal BikeSport van at the start. (No hand-ups).

    ALL riders must fill their own bottles. Individual support is not allowed at the feed zone. No attacking in the feed zone area or you will be DQd and excommunicated from the church of bike.

    • A crazy hard, super fun adventure with a bunch of your new and old cycling buddies.

    • Feed zones with Skratch and GU Energy Labs hydration & nutrition. Presented by Trailhouse, NorCal Bike Sport, and Bike Peddler.

    • Awesome prizes at the finish from our generous sponsors.

    • Event timing and results.

    • Hot coffee and fresh baked pastries from Black Oak Coffee Roasters the morning of each event.

    • Delicious lunch, cold Guayaki and Best Day Brewing beer at the finish.

    • Podiums for Top 3 All Categories long courses, and for Top 3 M/F/NB Overall short courses.

    • Cash prizes for Top 3 Pro M/F Overall.

    • Emergency Medical Support en route.

    • Unforgettable stories of adventure.

    • Free event photos from FinisherPix