Simple orange outline of a mountain range or peaks

Lake Sonoma MTB

October 24th, 2026 (Opens Aug. 16th, 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.

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28mi

5504 ft

85%Single Track

Route

The Lake Sonoma MTB Grasshopper is a thrilling mountain bike race that challenges riders with some of the most technical, flowy singletrack in Northern California. Set in the rugged landscape around Lake Sonoma, this 28.5-mile course features steep climbs, fast descents, and over 5,351 ft of climbing—with no easy way out. The race starts "en masse" from the bottom of the dam and climbs 2.25 miles before hitting the single track. The course enters the South Lake Trailhead and traverses the lake for 20 miles before hitting Bummer Peak Climb. From here you climb over 1,000 ft over the next 3 miles followed by a traverse around Bummer Peak on your way to North Slope and Boar Scat. At mile 26 you cross over Rock Pile Rd and then descend 700 ft. (with a few short climbs) to the finish at Dry Creek Parking area.

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 high 70s by midday. It’s possible to get warmer, and if we’re lucky we’ll get some rain leading up to the event to make for perfect trail conditions. 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

    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 at the venue on Friday and Saturday night.

    • 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 13.5

    Feedzone 2: TBD

    Refrence course map POI’s for more information on location


    We’ll have water, Skratch hydration, nutrition, Maurtne gels, 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
    Mike’s Bikes 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 Maurten gel nutrition. Presented by Mike’s Bikes

    • Awesome prizes at the finish from our generous sponsors.

    • Event timing and results.

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

    • Podiums for Top 3 All Categories long courses

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

    • Emergency Medical Support en route.

    • Unforgettable stories of adventure.

    • Event photos