Expected March 2028
Distance
Terrain
The San Blas Half Marathon sends runners through the streets of Coamo, Puerto Rico, over 21.10 kilometres of paved road that begins with a shotgun start and closes with the race's traditional finish in the city centre. The event is now in its 55th year and has long been a fixture of Puerto Rican distance running, drawing thousands of visitors alongside local and international athletes. Race day in Coamo is a warm, community-driven occasion, with the town turning out along the route and around the downtown finish area.
Traditional finish in downtown Coamo
New shotgun start for the half marathon
City streets lined with local supporters
One of the Caribbean's best known half marathons
Start / Finish
Coamo, Puerto Rico
Downtown Coamo, Puerto Rico (traditional city-centre finish)
Terrain
Route
Race Day
What you get
On the day
Marshals on course
Before you enter
Other questions
March in southern Puerto Rico is warm and often humid, with temperatures typically in the mid twenties to low thirties Celsius and a chance of afternoon showers. Start hydrating early, wear light breathable clothing, and use the water stations along the route.
The route follows paved city roads through Coamo and its surroundings, and the course profile is generally described as moderate rather than severe. Warm, humid Caribbean conditions are the main factor that affects finishing times, so plan your pacing with the climate in mind.
Yes. Coamo is a welcoming host town and spectators gather along the city streets and around the traditional downtown finish, which is the best place to see runners come home. Spectators should arrive early to find parking near the centre and be prepared for road closures while the race is in progress.
The half marathon starts and finishes in Coamo, with the finish in the downtown area. Follow the organisers' race-day instructions for the start assembly area, and allow extra time before the shotgun start for warm-up, bag drop and any pre-race formalities.
Cancellation and postponement terms are set by the organisers. Book flexible travel and accommodation where you can, and check the official event information and your entry terms for what happens to entries if race day has to change.
Entry fee
Registration isn't open yet. We'll show pricing when the organiser confirms.Coamo, Puerto Rico
Expected March 2028
Provisional date, around Mar 5Are you the organiser of San Blas Half Marathon - 21.10km?
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