The IOC has been reviewing all aspects of the Games in the past year, including potentially introducing traditional summer sports in the winter edition, to boost popularity and participation in the Winter Olympics.
It would also increase medal chances for countries that may not have strong winter sports traditions. Among potential additions mentioned were cycling and running with cross-country or snow events.
"For 2030, we have taken the decision, no crossover sports, no summer sports," IOC President Kirsty Coventry told a press conference.
She said any change would affect the Games from 2034 onwards. Salt Lake City will host the 2034 Winter Games.
"The Olympic programme commission... will look at all avenues, and that would potentially lend itself to 2034," she said.
Winter sports federations have opposed such plans, saying bringing in summer sports would dilute the brand of the Winter Olympics.
Introducing popular sports such as athletics or cycling in the Winter Olympics would also mean existing winter sports federations would have to share revenues with them.