Ironman Wisconsin, a Madison tradition for the past 16 years, will be back in the capital city for at least four more.
The event, which brings together the best athletes in the world for a triathlon around Madison and Dane County, has extended its contract through 2021.
"Ironman Wisconsin has become a Madison tradition and part of the fabric of our community," said Deb Archer, president and CEO of the Madison Area Sports Commission and the Greater Madison Convention and Visitors Bureau.
The 2018 Ironman Wisconsin will be on Sept. 9. The race features a 2.4-mile swim, a 112-mile bike ride and 26.2-mile run, ending in Downtown Madison.
Last year, about 2,500 athletes from 27 counties and 48 states competed in Ironman Wisconsin, with about 25,000 spectators watching the events.
"We are thrilled to continue this popular and incredibly scenic race in the series of global events," said Frank Lowery, regional director for Ironman.
"We have had a great partnership with Madison and look forward to continuing working together to produce quality events."
The Madison race has consistently been ranked as one of the best Ironman events in the world, ranked first in 2017 as the best host city and second in overall satisfaction among the competitors.
Ironman 70.3, a half-distance tuneup for Ironman Wisconsin, will be held once again in June, starting and finishing at Olin Park.