Seriously Fun, 5K Obstacle Run!

WAIVER - Liability

(Download, print & sign)


Click the link below to download. Print, sign & bring your waiver with you to the registration tent.




Event Info


Tri-Cities WA

Sunday, July 11th, 2021

Horn Rapids Motorsports Complex

Beardsley Rd

West Richland, WA 99353

It's time to get muddy, and we've got all the info you'll need to get ready for the big day!

Gates open at 10:00 am. You'll want to show up ONE HOUR prior to your wave time to allow enough time for parking, registration, etc.  Event held rain or shine, with possible postponement exceptions due to severe weather (flash flooding, tornado warnings, lightning storms, etc).

PRINT a copy of your order confirmation email (or save it on your phone) for faster check-in. Bring your Photo I.D. along with your signed waiver to the registration tent.  A Parent / Guardian will pick up MF Kidz bib(s).
Can't find your confirmation? CLICK HERE to enter the email address affiliated with your registration purchase and it will be resent to you.

- PARKING Parking is $20 cash per vehicle. You must park in our designated parking area only. No parking on streets, roads, or adjacent lots allowed. Absolutely no "walk-ins" from outside the designated event parking area will be permitted to participate in any Mud Factor event, no exceptions. There are accommodations inside the gate for drop-offs without charge.

- BAG CHECK You may drop off any items you don't want getting muddy or lost at our Bag Check tent for $5 cash. Grab a safety pin from the table and tear off the numbered bag check ticket off your running bib and attach it to your bag. Write the number on your arm with a sharpie as a reminder, as you may lose your bib on the course. Ask the runner what line they are placing your bag in for easier retrieval.

You may purchase or pick up your pre-ordered merchandise at the merchandise tent located in the festival area. You MUST pick up pre-ordered shirts on event day. We do not ship, refund, or credit pre-paid merchandise.

We recommend bringing extra clothes, shoes, and towels. Wear sunscreen. Bring plastic bags for dirty items. We have plastic car seat covers for sale at the merch tent if needed.  Bring water to hydrate before and after your run.  Mud Factor provides water at the 1.6 and 3.2 mile mark to help quench your thirst. Bring water on your run if you think you will need more at earlier intervals.  Please take only one cup per pass and do not use the drinking water as a rinse station. Please dispose of cups and bottles properly and do not litter on the course.

- PHOTOS Show us your photos! Upload them to our Facebook events page. Use hashtags #MudFactor #SeriouslyFun #MudRun. Our Instagram is

- WASH OFF STATION We will have a wash off area with running water.  Bring a towel and a change of clothes.  Lines and wait times can get long. We suggest bringing a few gallons of water and leaving them in your vehicle, then rinsing at your parking spot when you are finished. Please take all trash and dirty or unwanted items with you and do not leave our parking lot a mess.

Spectators are $10 cash the day of the event at the venue. Spectators have access to the festival area only - no course access. Sight lines to the course and obstacles is limited and not guaranteed. Children 13 and under are admitted free (as spectators) into the festival area. Bring chairs, hats, water and sunscreen.

We will have a local food vendor in the festival area. Please support them. No outside food or drinks allowed except water.  Bring Cash.

Late registration is available the day of the event at full price, $75 Adult Waves / $55 MF Kidz Family Waves.

- WAVE TIME CHANGE (Day of Event Only)
Please arrive one hour prior to the wave time you want to run in, and head to the Post Registration line at the registration tent. The fee is $15 cash to make this change.  

Change of plans and can't make it? The new participant will want to show up at least an hour prior to the wave time they'd like to run in. Have them bring a copy of the ORIGINAL PARTICIPANT'S CONFIRMATION EMAIL to the Post Registration line at the registration tent. Tell them to bring their I.D. and $15 cash to make this change.

- Change of Plans?  Switch to any other venue on our existing calendar or defer your registration to a future Mud Factor event before Mud Factor Tri-Cities 2021 online registration closes (10 am event day).  Strict deadlines apply.  Get started HERE

Updated 7/08 - FINAL - READ CAREFULLY and Share with all members of your party

COVID Safety Update as of 7/06:

  • Face coverings will be required during the registration check in process at the event.
  • Face coverings are recommended throughout the festival area. Please respect others personal space, especially around groups with children.
  • Face coverings will not be required during the run. You may be asked to temporarily pull up the supplied face sleeve while in the start chute.
  • We provide a face sleeve style bandana to all participants that may be used as a face covering within congested areas (such as the start chute, toilets, food lines) or during the run for your comfort/safety.
  • If you are sick, STAY HOME and defer your registration to another year. Deferment must be completed online before the gates open at 10 am. Standard change fees apply. Get started here: