When is high season in Colombia?

In high season prices in terms of tourism are a little more expensive and you should care more about reservations.

When is this high season?

From the middle of December to the middle of January
Semana Santa: in 2018 from March 25 to April 1 
From the middle of June to the middle of July
Carnival in Barranquilla, 2018: February 10-13
All the longer weekends (public holidays / festivos)

Check out public holidays in 2017 here. Check out public holidays in 2018 here