How to choose your next race in Costa Rica

This country's race calendar isn't anywhere. It's spread across organizers' Facebook pages, posters forwarded into WhatsApp groups, and announcements that appear three weeks before the event.

The result is predictable: you find out late, you sign up with your training half-done, or you miss the race you actually wanted to run.

Choose by date before you choose by race

The question isn't which race appeals to you. It's how many weeks are left and whether that's enough.

Distance	Weeks from a running base	If you're starting out
5K	4 to 6	8 to 10
10K	8 to 10	12 to 14
Half marathon	12 to 16	18 to 20
Marathon	16 to 20	A year, with a half in between

"Base" means you're already running three times a week without pain. If you aren't, count from the right-hand column.

Once the date is set, mark backwards on the calendar: your biggest volume week, the taper, and the two or three weeks where you already know you'll be travelling or buried at work. Those weeks exist whether you plan for them or not.

The start time decides more than the profile

A 10K at 6am in January and the same 10K at 8am in September are two different races, and not because of the route.

• Dry season, December to April: less rain, but the sun arrives early and hard. After 7am the heat is a factor.
• Rainy season, May to November: far more manageable mornings and afternoon downpours. Nearly every race starts early for that reason.
• Humidity is the missing number. On the coast a "cool" 6am race can sit at 90% humidity, and the pace you hold training in San José won't hold there.

Elevation: in Costa Rica, "flat" is rarely flat

The metropolitan area is built on hills. A route described as flat often has a couple of hundred metres of cumulative climb broken into short pieces — which is exactly what wrecks a pace.

Three things are worth checking on the course before you enter: where the longest climb is, which kilometre it lands on, and whether the finish is uphill. An uphill finish completely changes how you run the second half.

Altitude counts too: training in Cartago or Heredia and racing in Guanacaste is not the same as the reverse.

What to check before you pay

1. Registration deadline, and whether places are capped.
2. Kit pickup: day, time and location. It can eat an entire Saturday, and it's often not available on race day.
3. Cut-off time and course closure. If you plan to walk sections, this is the single most important detail and it's almost never on the poster.
4. Aid stations: how many kilometres apart.
5. Whether the distance is measured and certified, if your time matters to you.
6. Bag drop and parking, which decide what time you leave home.

Sign up with someone else

The strongest predictor of arriving at the start line trained isn't the plan. It's whether somebody else is running it too.

A group that picks the same race three months out turns training into a commitment to people rather than to an app. And on the morning you don't want to get up at 5am, that's the only thing that works.