Rosaryville Half Marathon and 10K
Race Information
Conveniently located right off the Capital Beltway, Rosaryville State Park in Upper Marlboro, MD offers fun and challenging terrain, that is also beginner-friendly. Not overly technical, this racecourse is perfect for an early-season trail running race. The racecourse at Rosaryville is beautiful and fun and winds through mixed hardwood forests and fields. The trails are twisty, relatively smooth, relatively flat, and fast. The half marathon course includes the 9-mile perimeter trail, the 2-mile interior trail, and wide-open horse trails. The 10K course includes 5 miles of the perimeter trail and just over one mile of wide-open horse trails.
Related Events
Did you know that this race is part of a series of runs? If you like this race you may want to run one of the following EX2 Adventures events.
Run Training Resources
Training for a half or full marathon?
Want to run faster, longer, and stay injury free?
Our friends at RunDoyen have have a proven track record of helping runners of all levels hit their goals with their roster of amazing running coaches, and effective training plans.
Get Matched with the Right Run Coach
Training with a run coach is one of the best ways to become a faster runner.
With coach matching you answer a few questions, then get matched with the best coach based on your individual goals and preferences. It’s 100% free to try!
Getting matched is 100% FREE to try, and there's no obligation to work with the coach. Click the button below to try it out.
Self-Serve Training Solution
Doyen Dashers is a personalized self-serve training solution, designed by the world's top coaches, built for runners of all levels built for runners of all levels.
Right now you can get full access with a 7 day free trial.
Dashers members get access to:
📅 Personalized Training Plans
📺 Full Training Video Library
📱 Online Training Log
💬 Unlimited Chat with Coaches
FREE Marathon Training Guide
Authored by RunDoyen’s world-class coaches, this guide covers every topic about training for the Marathon.
For a limited time, the marathon training guide is 100% free!
Pace Calculator
Find your running pace and splits, and learn if you can outrun dangerous animals with the RunGuides run pace calculator.

Tell us your race tips
