DateExpected
Mid October 2027
Based on past editions. We'll confirm when the organiser announces.
Venue
Fort Mountain State Park, Chatsworth, Georgia
Chatsworth, Murray County
Countdown
October
The full marathon distance on trail, with 1,676 m of climbing to earn it. A small field and a long day out in the Murray County hills.
Key facts
018-hour overall cut-off
02Intermediate cut-offs at roughly miles 11, 18.9 and 22.3
03Miss a checkpoint cut-off and your race is over
Create a free training plan for the Mystery Mountain Marathon & 12-Miler 42 km
7-day free trial, no card required
The course
The route
Chatsworth
Distance42km
Total climb1,676m
StartElevation
0 kmDrag map to rotate37.9 km
Weather
Mid-October, Chatsworth
23°CTypical high
9°CTypical low
-1°CColdest in 20 years
24%Days with rain
Highs around 23°C and lows around 9°C, but it has dropped to -1°C. Rain on 24% of days. Pack for the cold end, not the average.
NASA POWER data, 2006-2025, the week either side of race day
Results
Course verified. Results not yet available.
Organiser
OrganiserGeorgia Ultrarunning and Trailrunning Society (GUTS); race directors Kyle Torok and Hilary Kelley
Websitegetguts.com
Instagram@gutsrunning
Running since2008
Training
Training for the Mystery Mountain Marathon & 12-Miler 42 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Mystery Mountain Marathon & 12-Miler 42 km plan targets
Typical sessions
42 km with 1,676 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Hill reps and vert to prepare the climbs and descents
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your Mystery Mountain Marathon & 12-Miler 42 km plan.
7-day free trial, no card required.
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