Rio Del Lago 2021 is a qualifier for the 2022 Western States 100!

WSER Qualifier

Daylight Savings occurs on Rio race weekend. However, we will NOT be observing the time change until the race is officially over. You will need to keep your watches, clocks, etc set to the time clock beginning on Saturday. If you have a device that automatically changes, you will need to adjust. We will be following the mileage pace chart times and cutoffs based on the Saturday clock.


Welcome to the 20th running of the Rio Del Lago 100 Mile Endurance Run. We are excited to have you join us for this premier 100 mile event. Whether this is your first or tenth 100 mile race, we know you will have an unforgettable experience from start to finish.

Quick Facts

This is a 100 mile race taking place on Saturday, November 6, 2021. The race will start at Beal's Point in the beautiful Sierra Foothills of California, about 40 minutes east of Sacramento.

Photo credit: Keith Facchnino

The Course

Elevation Gain/Loss:
Approximately +13,874ft/-13,874ft.

Click here for 2021 Interactive Online Course Map with Course Elevation Profile.

Course Map:
Being Updated for 2021.


Rio Del Lago 100 begins at beautiful Beal’s Point, at Folsom Lake State Recreation Area in the Sierra-Nevada Foothills. With Folsom Lake as the sparkling backdrop you’ll traverse through Oak woodland and meadows, over bridges and creeks, up and down switchbacks and along the most spectacular trails in the area. This scenic 100 mile foot race combines 2 of The Best trail races in Northern California: American River 50 and Way Too Cool 50K.

The 100 mile course is a variety of terrains that novice and veteran runners alike will enjoy. Runners will begin their 100 mile journey running the perimeter of Beal’s Point to the American River Parkway. Out of Beal’s Point, the course then heads South on the American River Parkway to the historic Walker Bridge. The course will wind down under the Powerhouse and behind the Lake Natoma Inn hotel. The course remains on the south side of Lake Natoma on the American River Parkway through Willow Creek and then to the Aquatic Center. At the Aquatic Center, the course traverses across the bridge up to the Nimbus Bluffs.

Runners will ascend on a single track trail to the Hazel Bluffs. Upon descending from the Hazel Bluffs, the course will re-connect with the bike trail and intermix with fire roads and single track trails through Beal’s Point. After reaching Beal's Point, runners will enjoy single track trails and head north on the path worn by gold miners in search of riches: The Pioneer Express Trail, near the entrance of the Granite Bay State Park. Runners will continue to Granite Beach on the north side of Folsom Lake.

Runners leave Granite Beach and continue north towards Twin Rocks and Auburn, CA. Runners will pass through Horseshoe Bar and Rattlesnake Bar (no, we aren’t talking about stopping at local pubs, but rather passing over the sand bars that miners would pan gold from, but there ARE Aid Stations at each). The route continues to Power Plant, Avery's Pond, Dowdin's Post, and arrives at the base of Cardiac Hill. Runners will take a deep breath and then ascend up Last Gasp to the Auburn Dam Overlook. Exiting the Overlook, runners descend on the Western States Trail to the notable 104 year old No Hands Bridge.

From No Hands Bridge, runners will cross Highway 49 at Lower Quarry. The Rio course now joins forces with the iconic Way Too Cool 50K course. You will run along the scenic Quarry Road until continuing through Main Bar. You will make your way to Auburn Lake Trails, Goat Hill and descend down to the Upper Highway 49 crossing. From Upper Highway 49, you will follow the WS trail back to the meadow which will then bring you down the luge as you return to No Hands Bridge.

From No Hands Bridge, runners will re-trace their footsteps back to the Auburn Overlook (running DOWN Last Gasp, take that!) From there, runners follow the trails back through Cardiac, Rattlesnake Bar, Horseshoe Bar, Twin Rocks to Beal’s Point to cross the finish line and celebrate!

Course Map & Elevation

Rio del Lago 100 mile course map

  • Detail Map is currently being updated for 2021

Aid Stations & Restrooms (click to download)

pace chart

Click to download Aid Station / Pace Chart
Click here to view portable restroom locations.

Please note/remember, Rio Del Lago is cupless.

We will be providing all entrants a reusable cup for the aid stations!!

GU Reusable Cup

Aid stations will be stocked with:

  • Assorted GU Engery Products: Liquid Engery Gels, GU Gels - both caffienated and uncaffienated, GU Chews
  • Water, Roctane Energy Drink, Coke, Ginger Ale
  • Boiled potatoes and a complete line of ultra sweet and salty foods
  • Night time aid stations will have hot veggie broth soup, and quesadillas
  • You must carry two water bottles and/or hydration pack

Soup and hot food will be available at the following aid stations:

  • Horseshoe Bar
  • Rattlesnake Bar
  • Overlook
  • No Hands Bridge
  • Auburn Lake Trails
  • Cool
  • Granite Beach (on the return)

Please familiarize yourself with our aid station check points and note that there is NO CREW access at:

  • Willow Creek
  • Negro Bar
  • Horseshoe Bar
  • Cardiac
  • No Hands Bridge
  • Auburn Lake Trails
  • Highway 49
  • Granite Beach (on return to the finish)

**Crewing at one of these locations will result in runner disqualification. Thank you for your cooperation and understanding.

Rio Del Lago 100 Mile Endurance Run began in 2000 by Norm and Helen Klein. Sign up and keep the tradition going.

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Race Information

This is a 100 mile race taking place on Saturday, November 6, 2021. The race will start at Beal's Point in the beautiful Sierra Foothills of California, about 40 minutes east of Sacramento.

  • There are no refunds allowed for any reason including race cancellation. The Race Director reserves the right to modify or cancel the race or course for safety concerns or natural disaster. In such cases there will be No Refunds of race entry fees. Each athlete must accept any such risk of their entry fee paid. There is no complimentary race entry to a future race.
  • Entry fees collected are used to develop and produce the event, starting well in advance of the race date – including course preparation, race supplies, permits and administration. We pledge to make every effort to produce a fair and safe event for all participants. Any decision we make that impacts the race date or potential cancellation is carefully considered and based on the overall event safety and manageability.
  • Entry fees are non-transferable between individuals or to future races.

Participants will receive the following items:

  • Well stocked and themed aid stations
  • Enthusiastic volunteers
  • CRAFT Technical Shirt
  • Finisher's Athleisure Lightweight Pull Over Embroidered Hoody(for those finishing sub-30 hours)
  • Finisher's Belt Buckles (for those finishing sub-30 hours)
  • Finisher's medallion
  • Goodie Swag Bag
  • Night time and sunrise breakfast
  • Post race festival

Volunteer Requirement

For 2021, it is highly suggested (but not required for 2021) that each Rio Del Lago 100 runner is volunteer a minimum of 6 hours of service towards trail maintenance, a trail or road race event between December 1, 2020 and October 25, 2021 as a condition for participation at the 2021 event.

Race Check In

All runners must check in on Friday, November 5, 2021 at:

  • Fleet Feet - Folsom
  • 6610 Folsom-Auburn Rd, Folsom, CA 95630
  • Phone : 916-358-9484
  • ** Packet Pickup is from 12PM to 7PM **
  • For more information about Folsom State Recreation Area, click here.

    • All participants must pick up their packet and bib number on Friday, November 5th from 12PM to 7PM at Fleet Feet - Folsom.
    • There will be a course briefing at 4:30 A.M. on Saturday morning before the race starts.
    • Drop bags will be collected on Saturday starting 4:00 A.M. until 4:45 A.M.
    • Race will start at 5:00 A.M. SHARP!!

    Drop Bags & Pacers

    Drop Bags

    • Each runner will receive 3 issued NCU drop bags to be used on course, at packet pickup. These must used at Rattlesnake Aid Station, Overlook Aid Station, Auburn Lake Trails Aid Station.
    • All on course drop bags are 16" x 16", and all personal items must be in these bags.
    • Drop bags for Start, Beals (mile 21.48) and Finish, can be your own personal bag.
    • All drop bags are collected on race morning at the start and must be deposited by 5AM (race start).
    • Please look for the proper sign with your desired location.
    • Please label your drop bag with your name and bib number.
    • Pacers may have a drop bag at Beal's Point and can bring upon arrival. If a pacer needs a drop bag on course, it must be left at the start on race morning, by 5AM.
    • Please do NOT leave any valuables including keys, iPods, cell phones, etc in your drop bag.
    • NorCalUltras is NOT responsible for the loss of any drop bags.
    • It is the responsibility of each runner to claim his or her drop bags. If you cannot retrieve your drop bags, have someone else do it for you. Drop bags must be claimed by 12:00 PM, Sunday (real clock time, not race clock time).
    • Drop Bags will NOT be mailed to anyone. Any drop bags not picked up by 12PM will be gathered up and a team will go thru the bags and dispose of anything perishable and then donate all remaining clothing/shoes/bags/bottles/etc... to a local shelter.


    • Pacers can ONLY join a runner at the Overlook on the outbound (mile 45.22), Cool Fire Station (mile 69.13) on the inbound/return, the Overlook on the inbound/return (mile 76.83) and also at Rattlesnake Bar (mile 86.01).
    • Pacers must be at least 18 years of age. (Specific exceptions may be made in advance of the Run by the Run Director.)
    • You may have more than one pacer to help you get to the finish line, but runners may be accompanied by no more than one pacer at a time.
    • Pacers do need to check in prior to running to sign a waiver as well as pick up a PACER bib. This can be done at Packet PickUp on Friday or on race day, pacers MUST pick-up waiver/bib at Beal's State Park in Folsom only. Plan accordingly, these items will not be available at any other aid stations.
    • Pacers also need to clearly identify themselves at every aid station.
    • Pacers should be well conditioned to travel the distance with their runner.
    • Pacers are responsible for their own transportation to and from their starting location. Race management will not organize or facilitate any shuttle.
    • Pacers may eat and drink from the aid station tables. Pacers must enter and exit with their runner. No "muling" is allowed. "Muling" is when a pacer carries any supplies (drinks, food, clothing, etc) for the runner outside of the aid station area.
    • No trekking poles for runners or pacers, no dogs, no bikes, no horses.
    • If you are pacing, you must pick up your bib AND sign the waiver during one of these designated times. No exceptions!
      • - Friday, November 5th – 12 Noon – 7 P.M., Fleet Feet Sports Folsom
      • - Saturday, November 6th – 10 A.M. – 10 P.M., Beal’s Point, Folsom Lake

    Drop Bag Locations

    • Beale's Point (Start, Mile 21.48 and Finish)
    • Rattlesnake Bar (Miles 36.04 and 86.01)
    • Overlook (Miles 45.22 and 76.83)
    • Auburn Lake Trails (Mile 59.64)

    Drop Bag Return

    All drop bags must be retrieved at the finish line on event weekend, by 12PM (noon) on Sunday (real clock time, not race clock time). If you must leave early, please have a friend or family member pick up your drop bag. Any unclaimed drop bags remaining after the finish will be donated to charity on Monday following the race. We will NOT mail drop bags after the event. Thank you for your cooperation and understanding with our updated policy. Race management works very hard to expedite drop bag retrieval in a timely manner. However, we ask for your patience. All drop bags on course will not be returned to Beal's Point (finish line) until the aid station is officially closed. If you need your bag sooner, please make arrangements to retrieve them from the aid station. Thanks for your understanding and assistance with these guidelines.

    Crew Driving Instructions

    Excellent areas from which to view runners are Beal’s Point, Granite Beach, Rattlesnake Bar, and the Auburn Dam Overlook.

    Park fees: Rio Del Lago travels through the California State Parks – Gold Fields District and the Auburn State Recreation Area.

    All crewing and viewing areas are located in the California State Parks District and require a ($12) fee per vehicle unless you have a Golden Poppy Pass. If you frequently patron the Rio Del Lago trails (also home to AR50, Way Too Cool), please consider supporting the CA State Parks and purchase a Golden Poppy Pass.

    Crews are responsible for paying the day use fees ($12) for entrance in to the State Parks. If there is not a ranger present at the kiosk in to the parks, you are still responsible for self-payment through their drop box as you enter the parks. Crews need only to pay one time at a State Parks kiosk, but must show their receipt upon entry to each park at the entrance.

    • Please observe all posted signage and placards by the CA State Parks and Auburn Recreation Park District.
    • NorCalUltras will not be responsible for any violations or tickets.
    • No Crewing at “No Crew locations”.
    • ** Crewing at one of these locations will result in runner disqualification.

    Tips for Crewing
    Ultra runners really like a little extra TLC that can only come from friends and family. That's where Crew Teams come in to play. If you have agreed to be part of a Crew you are in for a great time! Here are some tips and pointers to make your crew experience as enjoyable as a gig like this could possibly be.

    Crew Driving Directions
    Click here to view driving directions for all accessible areas.

    Lodging Information

    folsom tourism Welcome to the City of Folsom and the start line of the 20th Annual Rio Del Lago 100 Mile Endurance Run! We invite you to explore all of the outdoor recreation, attractions, fine dining and shopping that Folsom has to offer. Visit

    All of our Rio del Lago 100 guests staying at our Folsom Hotels will receive:

    When booking...

    • Be sure to ask for the Rio Del Lago rate to get the special room prices.
    • Be sure to ask about deposits and refund policies as they may vary from hotel to hotel.



    Rio Del Lago Host Hotel
    Lake Natoma Inn

    702 Gold Lake Drive
    Folsom, CA 95630
    (916) 932-2751
    Click here for 2021 reservations
    *Rates start at $99/night for single or double occupancy. Rates good thru 10/22/21.


    Larkspur Landing

    121 Iron Point Road
    Folsom, CA 95630
    (916) 355-1616
    Rio Del Lago 2021 - Reserve Today!
    *Studios $109/night and One-Bedroom Suites $129/night. Includes breakfast and Wi-Fi.


    Courtyard by Marriott

    2575 Iron Point Road
    Folsom, CA 95630
    (916) 984-7624
    Book your group rate at the Courtyard By Marriott Folsom
    Must reserve by: October 9, 2021
    *King Bed $129/night and Double Queen $129/night.


    Residence Inn by Marriott

    2555 Iron Point Road
    Folsom, CA 95630
    (916) 983-7289
    Book your group rate at the Residence Inn by Marriott Folsom
    Must reserve by: October 9, 2021
    *Studio King Bed with sofa bed - $139/night and One Bedroom Suite Queen Bed with sofa bed - $139/night.


    Hampton Inn and Suites

    155 Placerville Road
    Folsom, CA 95630
    (916) 235-7744
    *Includes breakfast
    Click here for 2021 reservations
    *Double Queen $119/night or King Bed Study $119/night. Includes Breakfast. No Shuttle.


    Hilton Garden Inn

    221 Iron Point Road
    Folsom, CA 95630
    (916) 353-1717
    *King Bed $90.00/night and Double Queen $90/night.
    Click here for 2021 reservations


    Staybridge Suites

    1745 Cavitt Drive
    Folsom, CA 95630
    *Studio King Suite - $139/night
    Click here for 2019 reservations


    Fairfield Inn and Suites - Marriott

    1755 Cavitt Drive
    Folsom, CA 95630
    Must reserve by: Oct 18, 2019
    *King Bed $129.00/night and Double Queen $129/night.
    Click here for 2019 reservations

    Medical Information

    • Our medical team is comprised of EMT’s, Paramedics, RN’s, MD’s. They all are trail runners who have the knowledge, expertise and understanding of running an endurance event. The medical team will offer share some helpful hints as well as things to be aware of.
    • There are 4 medical stations on course staffed by our medical team: at the Start/Finish, the Overlook, Auburn Lake Trails and at Rattlesnake Bar (on the return), but a medical check is NOT required.
    • It is important that you take care of your body with fluids and fuel for the entire 100 miles.
    • Know your limits and know your body!
    • * Medical personnel have the authority to pull a runner from the race at any time.

    Awards and Timing

      Capital Road Race Management is the official timing company of RDL. We will be using the ChronoTrack B-tag timing system. You must wear your B-tag on your shorts or singlet. If you do not wear your B-tag following the instructions, you will not receive an official time nor be eligible for an award. Please read the B-tag instructions here.

      Overall awards will be given to the top three male and female. If you are competing for a top 3 overall award, you will be scored on "gun time." All age division awards will be based on chip time.

      Age group awards will be given to the top 3 in each ten year age division for both male and female.

      All official finishers (under 30 hours) receive a finisher's jacket and finisher's belt buckle. You will be presented with your finisher's jacket and belt buckle when you cross the finish line.

      A reminder that while we must order the jackets well before the event, we will do our very best to insure that you receive the jacket size you requested. If you are not happy with the way your jacket fits, you must wait until the event is over before we can exchange your jacket for a different size if the size is available. Shirts can be exchanged for a different size at the finish line, depending on availability.

    Post Race Festival

    You came to Rio Del Lago to run 100 miles, but you'll want to stay long after the race for the post celebration eats.

    Catering to the hungry Rio 100 mile finishers:

    Bobs Bistro
    • All night until the finish, we'll be serving up the following hearty fare:
    • Homemade veggie soup from Chef Tim Ruffino will warm you down to your toes and fill you up after your 100 mile journey.
    • Baja Fresh will have hearty chicken and veggie burritos, cheese quesadillas and chips and salsa, and starting at 5 A.M. they'll add in fresh egg burritos with and without meat.
    • Bob's Bistro will be cooking from 6 A.M. – 12 noon on Sunday:
    • Happy Hundred Hot Cakes
    • Sizzling Bacon – Just the way Porky Pig would want it!
    • Wide eyed Cup o' Joe

    Race Beneficiaries

    Fit for Girls exists to improve the overall health and well-being of adolescent girls. Within the context of physical fitness training, girls participate in lessons on a variety of topics such as nutrition, time management, and friendships. With this information and support, girls learn to make healthy choices, set goals and overcome obstacles while training for a 5k race. Fit for Girls provides participants with the opportunity to use commitment and hard work to build confidence, learn resiliency skills, and experience success as they cross the first of many literal and figurative finish lines!


    Rio 100 Mile Endurance Run Coaching/Training
    Contact Tom Flahavan

    The average high temparature for November is 66 degrees.
    The average low has been 42 degrees. Bring gear for any situation.

    Get Registered

    race roster logo
    Click here to register for 2021 the race on Race Roster.

    NEW GUIDELINES FOR 2021 - To be able to successfully run and complete Rio Del Lago 100 Miler, it is HIGHLY recommended that you have completed at least one 50 miler run (whether it be a race or in training) before October 25, 2021. And it is also suggested that you finish your run within an official time from any other event. For example, American River 50 has a 14 hour limit. This is in addition to your normal training. We are recommending this to help you get to the finish line. Remember, this is a 100 miler and will tax your body tremendously! Good luck!!

    "Your toughness is made up of equal parts persistence and experience. You don't so much outrun your opponents as outlast and outsmart them, and the toughest opponent of all is the one inside your head." - Joe Henderson

    Contact Us

    Julie Fingar
    Race Director

    Race Information, Aid Stations and Course


    Volunteers are the life blood of any event. We need your support! Please consider giving back to the sport through your volunteer contribution. Volunteer hours can be credited for ultra marathon service requirements. For spouses or friends of participants, this is a great way to enjoy and experience the event. Each volunteer will receive a technical hat, and post race food from Bob's Bistro.

    Click here to inquire about volunteering.