Murderkill Ultramarathons

The Murderkill Ultramarathons returns to Felton, Delaware on August 8th with a variety of challenging distances for runners seeking an old-school experience in nature. This race series takes place within the scenic Killen's Pond State Park and is named after its unique geographical feature — part of the Murderkill River. The park’s North portion features broad dirt trails (sand and organics), while the Southside offers single-track paths with some roots, all surrounded by lush greenery and shaded areas.
On race morning, participants will gather at 8am near the picnic tables in Killen's Pond State Park to start their journey around a mostly-dirt loop. The atmosphere is casual yet competitive; runners often come prepared for hot conditions but also make use of the pond nearby if needed. With temperatures typically ranging from 19°C to 28°C, humidity at about 73%, and occasional light rainfall, the race day weather can be both challenging and refreshing.
Established over several years in Felton, Delaware, this ultramarathon series has become a tradition for endurance runners who enjoy self-supported events. Participants come from all around to challenge themselves on Killen's Pond’s varied terrain without expecting full-scale aid stations or other modern conveniences. The event supports the local community through its Fat Ass style approach and attracts both seasoned veterans and first-time ultramarathoners looking for a unique running experience.
The Murderkill Ultramarathons takes place within the park, featuring an almost entirely dirt loop that runs close to Killen's Pond Road in Felton. Runners should expect some roots and rocks but not overly technical terrain, with about 80 feet of elevation gain per lap. The race starts at 5025 Killens Pond Road near picnic tables where participants will find bathrooms just a short walk away. A footbridge allows crossing the pond, while there is also an opportunity to use the boat ramp area if needed.
Weather on August 8th in Felton can be variable but generally comfortable for running with average temperatures around 24°C and conditions that feel like they are due to high humidity and UV index of seven. Runners should anticipate slight precipitation risks, though sunshine is expected for most of the day during race hours. Trail surfaces will remain hard and dry despite occasional rain.