With our current world situation, this is a loaded question – so we’ll answer here in TWO parts 🙂
Normally – Triathlon season starts depending on your region and location. As an example here in North America triathlon season generally starts in March and goes through to November, depending on the hyper local race venue (ie. a March or November race would take place in a warmer state such as Florida or Arizona). There are many hundreds of races that take place all over the globe however that run most months of the year. For us here at Breakaway in Colorado our events season is primarily MAY through late SEPTEMBER. This usually gives us ideal weather and water temperatures for our athletes.
Currently (Spring 2020) – With the current world situation and dozens of events being cancelled, postponed or deferred an exact “start” to the triathlon season is unknown. While many athletes continue to train and prep as best they can we hope to have more answers to the local start of triathlon season before the close of this month (April 2020).