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Mystery Mountain Marathon & 12-Miler

calendar_today 18 Oct, 2026

directions_run Running

sell $60.00 – $85.00

Mystery Mountain Marathon & 12-Miler

About the Event

About the event

The 18th annual Mystery Mountain Marathon & 12-Miler (aka MMM) features marathon and 12-mile trail races traversing difficult, sometimes technical, but stunningly beautiful trails, with panoramic views of fall foliage displayed on the surrounding mountains. The elevation gain for the marathon is about 5,500 feet runners will enjoy single track, rugged mountain bike, and smooth horse trails while running over and around Fort Mountain, passing the mysterious rock wall built at the top of the mountain over 1,000 years ago. But the highlight of the weekend, as always, will be hanging out by the lake with friends old and new after the race at our fun, low-key celebration. Join us! The event is located at gorgeous Fort Mountain State Park, approximately 90 miles north of Atlanta and 50 miles southeast of Chattanooga. For more race information, visit the MMM race page on our website: MMM

Pricing

Enter before Saturday, Sept 26 for guaranteed shirt size. Join GUTS for just $15 a year and receive $5 off GUTS races plus other benefits. GUTS Membership is available on Ultrasignup - GetGUTS

Cutoffs

12 Miler: 6-hour time limit 3.5 hours at Park Entrance (approx 8 miles) Marathon: 8-hour time limit Cutoffs along the course are as follows: 3.5 hours at Park Entrance (approx 8 miles) 3.5 hours at Power Line Aid Station (approx. 11 miles) 6.0 hours at Far Out Aid Station (approx. 18.9 miles) 7.0 hours at Last Gasp (approx 22.3 miles) Please do not harass the aid station volunteers to let you continue after the cutoff. The cutoffs are for your safety. We need you and our sweeps off the mountain trails before dark. Furthermore, it will be the discretion of the race director and EMT supervisors to pull a runner from the race if it is determined unsafe for the runner to continue.

Awards

Women/Men: Top 3 overall 1st place masters & grandmasters women/men

Races Offered

12 Miler

Oct 18, 2026

straighten

Distance — 19.3K

terrain

Type — Running

timer

08:00

sell

$60.00

Marathon

Oct 18, 2026

straighten

Distance — 42.2K

terrain

Type — Running

timer

08:00

sell

$85.00

Weather History

These values represent the 3-year monthly averages for October in Chatsworth.

thermostat Temperature
12.0° / 22.7°
wb_sunny Feels like
10.2° / 20.9°
light_mode Avg sunshine hours
9h 32m
water_drop Avg rainfall
1.5 mm
ac_unit Avg snowfall
air Avg wind speed
9.6 km/h (Light breeze)
opacity Sweat loss rate
Moderate
terrain Course conditions
Firm and slightly soft
sunny Max UV Index
Moderate (4.0)
humidity_mid Humidity
66.4%
wb_twilight Sunrise
07:45
nightlight Sunset
19:03

About Chatsworth

Learn more about the host city, Chatsworth.

Scenic view of

Chatsworth is a small town in Georgia's Northwest High Country, near Dalton and Chattanooga.

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Hotels & Places to Stay

Race Results

All-time top performances and historical records for Mystery Mountain Marathon & 12-Miler.

Place Name Year Time
🥇 Dennis Bauer '08 3:34:19
🥈 Malcolm Campbell '08 3:35:28
🥉 Mitchel Pless '13 3:46:59
4 Michael Green '08 3:48:05
5 Benjamin Foote '22 3:54:37

Runner Reviews

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