Run Across CT
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Run Across CT 123
Run Across CT 123 is a point-to-point ultramarathon that traverses Connecticut from East Thompson to Southport over a 123 mile course. The route passes through about 25 towns and combines maintained trails, backroads, bike paths, and local highways. Nearly half the course, approximately 57 miles, is on well-maintained trails. Total ascent is about 4,000 ft and total descent about 4,500 ft.
Aid stations are placed along the course and are staffed by volunteers. They provide hydrating drinks, electrolyte replenishment, and light snacks, and staff can respond to common ultramarathon issues such as blisters and fatigue. Runners may meet their crew at aid stations only, except in medical emergencies. There are five intermediate cutoffs plus a finish cutoff; the overall time limit for the course is 36 hours, and participants must maintain roughly a 17.5 minute per mile pace (about 3.5 mph) to stay ahead of cutoffs.
Event options include:
- Solo 200K
- 6-person 200K relay
- 3-person 200K relay
- Solo 100K
This is a no-refund event; rollovers are allowed upon request. Finish awards include a belt buckle for 200K finishers, medals for 100K and relay finishers, and a 2025 CT123 t-shirt for all finishers. Registration closes Fri, Apr 30 at 11:59 PM ET.
Volunteers staff aid stations, course marking, checkpoints, and start and finish logistics; volunteers receive race credit, swag, and food. Visit the organization's website for the most recent information.
