Registration has opened for the 'world's biggest' IRONKIDS and Night Run Bolton UK.

Both events are part of the IRONMAN 70.3 weekend and are set to return to Bolton next year.

Those who register before January 9 will benefit from an Early Bird price.

Last year, more than half the IRONKIDS spots were reserved in two days, with the event 'almost completely sold out.'

The IRONMAN 70.3 weekend traditionally transforms the town centre for three days, with thousands participating and even more cheering them on.

Next year the fun returns earlier in the calendar than previously, with the events taking place in early JuneNext year the fun returns earlier in the calendar than previously, with the events taking place in early June (Image: Supplied)

Next year, the fun will begin earlier than usual, with the events scheduled for early June.

Night Run Bolton UK will kick off the weekend on Friday, June 6, 2025.

Up to 2,000 runners will take on the town centre and Queens Park, with both a 5k and 10k route available.

Every year the IRONMAN 70.3 weekend transforms the town centre across three days with 'thousands taking part and thousands more cheering them on'Every year the IRONMAN 70.3 weekend transforms the town centre across three days with 'thousands taking part and thousands more cheering them on' (Image: Supplied)

On Saturday, June 7, Bolton's children will be taking part in the 'world's largest IRONKIDS.'

Up to 6,000 young people aged 3-16 will run 500m, 1000m, or 1500m.

The weekend will conclude with IRONMAN 70.3 Bolton on Sunday, June 8, with entries already open.

Up to 2,000 runners will take to the streets of the town centre and Queens Park on June 6Up to 2,000 runners will take to the streets of the town centre and Queens Park on June 6 (Image: Supplied)

Councillor Nadeem Ayub, Bolton Council’s executive cabinet member for culture, said: "Bolton’s IRONMAN 70.3 weekend is a spectacular family-friendly event that gets bigger every year.

"There is something for people of every age and fitness level, from young children to fun runners to dedicated amateur athletes.

"Our IRONKIDS is a great Bolton tradition that thousands of children have taken part in over almost 20 years and I encourage people not to miss out."

The full weekend schedule for IRONMAN 70.3 Bolton 2025 is as follows: Night Run Bolton UK on Friday, June 6, IRONKIDS UK on Saturday, June 7, and IRONMAN 70.3 Bolton on Sunday, June 8.