The race was originally due to take place on October 3, but organisers have confirmed it will now be staged on March 27 in 2022.

"Uncertainty" over social distancing rules was cited as the reason for the postponement by Run 4 Wales, which runs the event.

Wales has reported about 219,000 coronavirus cases, resulting in at least 5,575 deaths since the start of the pandemic.

More than half of the Welsh population has been fully vaccinated against COVID-19, leading to calls for restrictions to be eased.

But there are suggestions two-metre social distancing rules could remain in place for the rest of the year.

"While the vaccine rollout in the UK continues to provide cause for optimism, the situation in Wales remains uncertain, with the Welsh Government currently setting a maximum outdoor event capacity of 4,000, including event-related spectators," said Run 4 Wales chief executive Matt Newman.

"At present there are also no plans to relax the two-metre social distancing rules, which provides significant operational challenges for mass-participation event organisers.

"Due to this uncertainty and in agreement with Cardiff City Council, circumstances dictate that we must now postpone to the spring of 2022.

"The health and safety of race participants, their supporters, event volunteers and the Run 4 Wales staff team is at the forefront of our decision making and we hope that everyone understands the reasons for this decision."

The Cardiff Half Marathon usually attracts more than 25,000 participants and around 100,000 spectators.

It last took place in October 2019, when Kenya’s Leonard Langat set the men’s course record with a time of 59min 30sec.