Houston is 1 hour behind Medellín
Best overlap: 9:00 AM to 6:00 PM in Medellín is 8:00 AM to 5:00 PM in Houston.
The sweet spot is 9:00 AM to 6:00 PM Medellín time, matching 8:00 AM to 5:00 PM in Houston. With 9 hours in common, treat scheduling almost as if the two cities were in the same region. Watch the DST gap — when Houston changes its clocks and Medellín stays the same, this window slides by an hour.