Atlanta Fat Ass 50K

Lithia Springs, United States • 4 Jan 2026

Atlanta Fat Ass is an annual, low-key ultramarathon held at Sweetwater Creek State Park in Lithia Springs, Georgia. The event offers 50K and 25K options and promotes a post-holiday, no-frills atmosphere that GUTS describes as “burn off those pounds.” Runners tackle six laps on white trail loops (counter-clockwise) with a few hills and rocky sections, including Jack’s stairs; poles are allowed and the course is well marked. Start/finish is at the Group Shelter, with park parking fees in effect.

A FatAss Crockpot Chili Contest adds a social post-race element. The race is limited to current GUTS members. Volunteers support the event. Visit the organization's website for the most recent information.

Race information

50 km
50k
25 km
25k
Visit the organization's website for the most recent information.
Trail runs nearby

The Yeti Snakebite 50/50 returns in August at Sweetwater State Park near Lithia Springs, GA, in the Atlanta area. The race centers on a deceptively simple 6-mile loop that takes you over the river, through the woods, and into the pain cave. The clock runs for 8.88 hours, and participants can go as f..

Mind Freak 50K Trail Run takes place in Marietta, Georgia, at 4331 Burnt Hickory Rd NW. The event uses a backyard-ultra style format, featuring a 1.5 to 2 mile trail loop that runners may repeat to reach up to about 50K or more. It emphasizes flexibility and self-support: participants bring their ow..

The Run for the Widows & Orphans 5K is an annual event held in Rockmart, Georgia, on the scenic property of the founder of All For His Glory Ministries. Scheduled for September 20, 2025, this 4th edition offers two 5K race options: a traditional road course and a more adventurous trail course featur..

PCOS Trailblazers 5K Atlanta: Walk, Hike, or Run for PCOS Awareness is held at Sweetwater Creek State Park in Lithia Springs, GA (1750 Mt Vernon Rd). The event offers a 5K (3.1 miles) route along the Yellow Trail and a 1-mile Fun Hike option. It’s described as family-friendly and untimed, open to al..

Southside Scramble is Atlanta’s only intown trail race, held at Southside Park (3460 Jonesboro Rd SE, Atlanta 30354). The roughly 10-mile course winds through pine- and hardwood-shaded forests just inside the Perimeter, featuring looping singletrack, roller-coaster descents, gravel stream crossings,..

City of Rockmart hosts the fifth annual Running for a Paws 5K in downtown Rockmart, Georgia. The 5K takes runners through downtown streets and onto the fast Silver Comet Trail for an out-and-back course, with the turnaround just past Vinson Mountain Trailhead and the finish along the trail near Vete..