TEMPE, Ariz. — After 21 years in the Valley, Ironman Arizona will return to Tempe for the final time on Sunday — but rain in the forecast could force a major change to the race.

More than 2,000 athletes from across the country and around the world are checking in ahead of the event, which Tempe officials say has become too difficult to host as the city continues to grow and construction expands.

“We're sad to see this race go. It’s a long-standing race,” race director Ryan Cooper said.

The course has earned a strong reputation among competitors. The run portion is rated third-best in North America, and the event is known as the “Valley of the PR” — personal record — thanks to its flat roads and fast times.

Among those competing is Jacinda Rose, who traveled from Las Vegas for her sec

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