Rosaryville Half Marathon, 10K, 5K Trail Run

Saturday March 28, 2026

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Rosaryville Course Descriptions

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 in nature, this race course is perfect for an early season trail running race.

** Race Day Information Email Sent to Racers **

The race course 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. The 5K course consists of part of the perimeter trail and some equestrian trails.

There are 9 aid stations on the half marathon+ course, 4 aid stations on the 10K+ course, and 2 aid stations on the 5K+ course. All aid stations have cups, water, and gatorade. One aid station on the half marathon course also has snacks (~ 8.8).

Race Date: Saturday March 28, 2026
Start Times: 9:00am (5K), 9:10am (HM), 10:15am (10K)
Location: Rosaryville State Park in Upper Marlboro, MD
Course Length: 13.5ish Miles (HM+), 6.7ish Miles (10K+), 3.6ish Miles (5K+)
Elevation Gain: ~1,000 feet (HM), ~500 feet (10K+), ~250 feet (5K+)
Bathrooms: Portajohns at start/finish and on course (mile 6 of HM, 4.2 of 10K)
Contact: Andy Bacon (RD) 703-338-3965 and info@ex2adventures.com

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Volunteer

Registration Fees

Half Marathon

$70 – New year (by 1/1)
$75 – Early (by 1/29)
$80 – Regular (2/28)
$85 – Late (by 3/27)
$90 – Race day (if not sold out)

10K

$50 – New year (by 1/1)
$55 – Early (by 1/29)
$57.50 – Regular (by 2/28)
$60 – Late (by 3/27)
$65 – Race day (if not sold out)

5K

$40 – New year (by 1/1)
$45 – Early (by 1/29)
$47.50 – Regular (by 2/28)
$50 – Late (by 3/27)
$55 – Race day (if not sold out)

Register

Registration Fee Includes

Fun and challenging course design, sweet finisher medal, professional race operations, wonderful volunteer support, awesome aid stations, medical support, plentiful post-race food (breakfast burritos and other tasty treats – yum!), electric atmosphere, great music, free race photos, awards and give-a-ways, and a race t-shirt you’ll love.

Race Day Schedule

7:30 – Check-in opens
8:50 – 5K pre-race brief
9:00 – 5K start
9:05 – Half marathon pre-race brief
9:10 – Half marathon start
9:30 – Post-race food available
10:05 – 10K pre-race brief
10:15 – 10K start
10:30 – 5K awards (top 5 in each category) and sponsor give-a-ways
11:45 – Free kids race*
12:15 – HM and 10K awards (top 5 in each category) and sponsor give-a-ways

* Kids race is for ages 2-11. We split into age groups and run short out and back ‘race’. Kids who participate can pick from the Treasure Box

Rosaryville Half Marathon Finisher Medal

Race Location

Rosaryville State Park
7801 West Marlton Ave.
Upper Marlboro, MD 20772

We stage the race out of Pavilions 1 and 2 in the back of the park. You must enter the park off of Route 301. You do NOT need to pay the parking fee as we cover it for you. Follow race parking signs after you enter the park. We park primarily in the large grass fields adjacent to the staging area.

Race Rules

Portable music players or any device requiring IN-EAR head phones are not permitted.
Outside assistance is only permitted within 50 meters of an aid station.
Race numbers must be worn on the front and must be visible at all times.
There are no cut-off times.
Pets and pacers are not allowed on the course.
Baby strollers are not permitted on the course.
Respect other racers, volunteers, race staff, and the environment. No littering.
Poor sportsmanship may result in disqualification.
Racers must notify race officials if they drop out of the race.
Stay on designated trails.

Rosaryville Half Marathon, 10K, 5K Trail Run

Rosaryville Course Descriptions

Registration Fees

Registration Fee Includes

Race Day Schedule

Race Location

Race Rules

Age Groups

Additional Information

Sponsors

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