Mystery Mountain Marathon

Chatsworth, GA, USA · October 18, 2026
partly-cloudy-day44°·65° high·Light·Dry
9
Register

Race Day Weather

partly-cloudy-day
44°at start
65° high
Light
Dry

Cool start, warming finish

Runners will face cool temperatures starting at 44°F, rising to a warmer 65°F by the finish. Winds will be light at 6 mph, mostly non-factor, with headwinds around miles 7, 17, 23, and 26. Humidity will be moderate at 59%, so runners should stay hydrated and adjust their pace conservatively as they approach the valley. Notable climbs at miles 2 and 4 will be challenging, but tailwinds from miles 9-10 should offer some relief.

Race day forecast available in 5 days
partly-cloudy-night8
partly-cloudy-night8
partly-cloudy-day8
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9

Pace Calculator

Distance: 26.2mi
0:00:00
HH:MM:SS
Pace
—
Weather Adj.
—
Common Goals:

Get forecast alerts for Mystery Mountain Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

Race Info

Marathon and 12-mile trail races traversing difficult, sometimes technical but stunningly beautiful trails, featuring panoramic views of fall foliage displayed on the surrounding mountains. Climbing and descending for about 5,500 feet of elevation gain, 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. Source

FAQ

When is the 2026 Mystery Mountain Marathon?

The 2026 Mystery Mountain Marathon will be held on Sunday October 18, 2026.

Is the Mystery Mountain Marathon a Boston Marathon Qualifier?

No, the Mystery Mountain Marathon is NOT a Boston Marathon qualifier.

What is the time limit for the Mystery Mountain Marathon?

The time limit for the Mystery Mountain Marathon is 8 hours.

What will the weather be like for the 2026 Mystery Mountain Marathon?

The forecast calls for a high of 67°F and a low of 46°F with a 6% chance of rain.

What is the elevation profile of the Mystery Mountain Marathon?

The Mystery Mountain Marathon has 5500ft of total elevation gain. View the interactive course map above for a detailed elevation profile.

Historical Weather

Based on 17 years of data
Avg Temp
75°F
L:52° H:76°
RunScore
7
Conditions
Rain Freq
6%
1 of 17 yrs
Wind6mph
Dew51°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
partly-cloudy-day
51°/78°-
8
2024
clear-day
51°/82°-
8
2023
clear-day
39°/67°-
8
2022
partly-cloudy-day
42°/68°-
8
2021
clear-day
63°/81°-
7
2019
cloudy
54°/70°Light
8
2018
cloudy
57°/77°-
8
2017
partly-cloudy-day
62°/85°-
7
2016
clear-day
53°/74°-
7
2015
cloudy
58°/72°-
8
2014
clear-day
63°/76°-
8
2013
clear-day
52°/80°-
7
2012
cloudy
60°/74°-
8
2011
clear-day
55°/72°-
8
2010
clear-day
47°/87°-
7
2009
clear-night
38°/70°-
8
2008
clear-night
33°/72°-
7