Sign up and verify details on the organizer’s official page.
At a glance
A muddy, obstacle-filled Mother's Day weekend adventure for all ages, supporting a wonderful cause with plenty of fun and team spirit.
Fun
Competitive
Quirky
Festive
For a Cause
From the organizer
Keeping with tradition, Harmony's 14th annual Mudder's Day Madness Mud Run is the Saturday before Mother’s Day, May 9th, 2026. During our traditional 5K, the course spans across Montvale’s muddiest trails with 20 obstacles. From Adversity Hill to the Tire Traverse to the A-Frame Climb, runners from ages 8 and up can race on their own or with a team. Costumes are encouraged and celebrated! In addition to our 5K, we also have a family friendly, untimed Fun Run for anyone ages 4 and up! The Fun Run distance is about 1.2 miles and will include trail running, field running, obstacles, and mud, of course! Early bird pricing ends after February 28th, so register today!
Medals will be presented for fastest 3 male & 3 female 18+ overall, and for the fastest 3 male & 3 female 17 and under overall only. Trophies will be awarded to the largest team, best team costumes, and fastest team! All participants will get swag and a participation pin! Vendors, food trucks, refreshments, and music will be onsite for all to enjoy. NEW THIS YEAR! 1 free beer for every 21+ registered participant after the event! We'd like to give a huge thank you to Peaceful Side Brewery for making this possible by sponsoring our beer tent again this year!
Funds raised from this event will support Harmony’s therapeutic programming at Camp Montvale which includes our equine therapy program and therapeutic camps for foster and adoptive children and families.
Parking does not open until 8:15. Please do not arrive before 8:15am. ALL participants/spectators must park in the designated, fenced-in parking area at the front of the property. (Accessible parking is available. Please ask parking attendant for more information.) There will be a short walk to get to the event. Due to traffic flow concerns, all participants should leave their car parked until after they complete the race. Participants who pick up their race packets on race day will need to stay at the event until they are finished with the race; leaving/re-entry will not be permitted. Feel free to enjoy breakfast and/or coffee from one of our food trucks while waiting for your start window.
Racers can begin bag check at 8:15am and groups will begin running as soon as 10am.
All teams must have a minimum of 4 participants. If any team does not have 4 teammates by April 30th, the members of the team will be changed to individual runners.
All 5K participants and teams will be timed! Teams that want to compete in the fastest team category will be timed at the 4th teammate to cross the finish line's time.
Ages 8 and up are allowed to register and participate in the 5K. The trail is challenging, we ask that parents or guardians stick close to their children on the course.
Ages 4 and up are allowed to register and participate in the Fun Run. It will begin at 11:15am. Parents - while this course is not as challenging as the 5K, it will include difficult terrain, obstacles, and mud, so please use your best judgement in allowing children to participate without you. Waivers for all participants will be signed prior to running.
You will be running on uneven terrain with wet and muddy obstacles for both the 5K and Fun Run courses. Therefore, the use of headphones, baby strollers, bicycles, roller blades, and pets are prohibited.
You do not want to lose a shoe, so we highly recommend that you tape your shoes! We will have very limited tape available on a first come first serve basis. Please plan to bring your own tape.
Changing areas and outdoor showers are available post-race.
Any runner remaining on the course at 12:30pm will be picked up by race personnel.
REGISTRATION
Great for
Family Friendly
Military & First Responders
Embrace the mud and celebrate Mother's Day weekend at the 14th Annual Mudder's Day Madness Mud Run in Maryville, TN. This event offers a challenging 5K with 20 obstacles across muddy trails, open to ages 8 and up, with timing for competitive runners and teams. A family-friendly Fun Run (1.2 miles) provides a gentler, untimed option for ages 4 and up, also featuring mud and obstacles. Costumes are highly encouraged, adding to the festive atmosphere. Beyond the fun, your participation supports Harmony’s therapeutic programming for foster and adoptive children and…
What to expect
Navigate 20 unique obstacles and muddy trails in the 5K, or enjoy a shorter, untimed Fun Run.
Celebrate post-race with food trucks, music, and a complimentary beer for 21+ participants.
Compete for fastest times, largest team, or best costumes, all while supporting therapeutic programs.
Standout details
20 obstacles on muddy trails
Costumes encouraged and celebrated
1 free beer for 21+ participants
Supports therapeutic programming for children
Perks & features
Awards
Chip Timed
Food & Drink
From the public listing — confirm on the official site.
Effort level
Overall course read based on terrain, elevation, footing, and typical conditions.
Solid Challenge
Typical course trends
Obstacle-style terrain
Mud or obstacle footing
Typically hilly
Distances & registration
3 options
Use the official signup link above for all distances.
5K
2 options · closes May 9, 2026, 7:59 PM EDT
10d 2h 8m left
(Ages 13 and up)
Closes May 9, 2026, 7:59 PM EDT · From $48.70
(Ages 8-12 years)
Closes May 9, 2026, 7:59 PM EDT · From $40.75
1 Mile
1 option · closes May 9, 2026, 7:59 PM EDT
10d 2h 8m left
Fun Run (Ages 4 and up)
Closes May 9, 2026, 7:59 PM EDT · From $32.80
Auto-drafted from the public listing — confirm details on the official event page before signing up.
Guaranteed shirt cut-off is April 2nd! Shirts and bibs must be picked up in advance of the race (see Race packet Pick-Up Section below for more information). Participants who registered after April 2nd will have first come first serve shirt options at packet pickup.
Online registration will remain open through the day of the race. HOWEVER, once the race is at capacity, we will close registration. Therefore, REGISTRATION ON THE DAY OF THE EVENT IS LIKELY NOT AN OPTION AND SHOULD NOT BE COUNTED ON.
WINDOWED START TIME FOR 5K
The race will have windowed start time corrals: 10:00-10:30, 10:30-11:00, and 11:00-11:30. You may cross the start line at any time during your chosen time window! You must select your windowed corral when you register. Each corral is capped at a predetermined number of registrants. If the window you prefer is full, choose any open window and then contact us at connect@harmonyfamilycenter.org to make the correction. Teams should choose a window prior to registration and share with all team members for their registration. Any team or individual interested in competing should place themselves at the beginning of whatever window chosen to avoid as much congestion as possible. We recommend all participants who intend on walking the course select the first window, as all participants still on the course at 12:30pm will be picked up by race personnel.
RACE PACKET PICK-UP
Please let us know if you will be picking up packets for 4+ people prior to you picking up! We will need the pickup person's name, the other participants names, and the location of packet pickup in order to be prepared for you. Please email connect@harmonyfamilycenter.org with this information.
Monday, May 4th from 4-7pm- Xul Beer Company, 213 E 5th Ave., Knoxville, TN 37917
Wednesday, May 6th from 9am-5pm- Harmony Office, 118 Mabry Hood Road, Suite 200, Knoxville, TN 37922
Thursday, May 7th from 4-7pm, Peaceful Side Brewery, 106 Everett Ave., Maryville, TN 37804
Limited packet pick up is available on race day. Please arrive at/after 8:30am to pick up packets race morning. NOTE: Parking does not open until 8:15. Please do not arrive before 8:15am. ALL participants/spectators must park in the designated, fenced-in parking area at the front of the property. (Accessible parking is available. Please ask parking attendant for more information.) There will be a short walk to get to the event. Due to traffic flow concerns, all participants should leave their car parked until after they complete the race. Participants who pick up their race packets on race day will need to stay at the event until they are finished with the race; leaving/re-entry will not be permitted. Feel free to enjoy breakfast and/or coffee from one of our food trucks while waiting for your start window.
Racers can begin bag check at 8:15am and groups will begin running as soon as 10am.
T-SHIRTS
T-shirts guaranteed for all who register by April 2, 2026. Shirts for anyone who registers after April 2nd will be available on a first come first serve basis at packet pick-up (see Race Packet Pick-Up section above for more information).
MEDALS
Medals will be presented for fastest 3 male & 3 female 18+ overall, and for the fastest 3 male & 3 female 17 and under overall only.
Team award trophies will be given on event day for the Largest Team, the Fastest Team (teams that want to compete in the fastest team category will be timed at the 4th teammate to cross the finish line's time), and the Best Dressed Team. To compete in Best Dressed please check in with the Harmony Family Center table in the Runner's Village prior to the race.
TIMING
Race Day Events will be timing this event. Contact Martin Coleman at martin@racedayevents.net with any questions.
This event is timed electronically with a timing chip attached to your race bib. Your race number/chip is programmed to coincide with your individual race number. During the event, you will cross mats that will record your time from your disposable race bib. Please do not BEND, TEAR OR ALTER your race number. Runners must wear the bibs on the FRONT of their person, and must wear the bib number associated with their name.
RESULTS
Race Day Events will be timing this event. Results will be available at www.RunSignUp.com.
INFORMATION
For information on running, sponsoring, or volunteering on race day please contact connect@harmonyfamilycenter.org
WEATHER DELAY/CANCELLATIONS
The Race Director will monitor the weather and make a decision if any action will be taken to modify the race. Possible changes include: altering the start time, altering the course, or in extreme situations cancellation of the event. Visible lightning occurring within 30 minutes of the scheduled start will cause the race to be postponed for a minimum of 30 minutes. Additional sightings will continue to delay the race in 30-minute increments up to a maximum of 3 delays.
Race personnel reserve the right to delay, cancel, or suspend the race or modify the course due to inclement weather. As stated on registration and race pages, there are no refunds or transfers. Participants must abandon the race if ordered to do so by the race personnel, medical staff, fire/paramedics or police personnel.
Fun
Competitive
Quirky
Festive
Family Friendly
Military & First Responders
Awards
Chip Timed
Food & Drink