Louise Minchin's last day on the BBC Breakfast sofa will be September 15.
The presenter announced the news on Wednesday's show.
"I'm going to be leaving this programme on September 15, so I think it's two weeks today," she said.
It would have been 20 years this December that she's worked on the show, she told her co-host Dan Walker.
The presenter first appeared on the broadcaster’s flagship morning show in 2001 and moved with its red sofa to Media City in Salford as a lead presenter in 2012.
"It's a big change," she said,
But she said she won't miss the early morning wake ups.
"Honestly when that alarm goes off every morning, I'm like 'oh!' so that's the thing I'm most looking forward to," she said.
Her co-host asked her if she'd regretted the decision to leave since it was first announced in June.
But she said it's the right decision for her.
"Of course there's a huge amount of nerves, and I'm having the most extraordinarily vivid anxiety dreams which are keeping me awake."
She added that she's looking forward to watching Dan Walker on breakfast and the new series of Strictly Come Dancing.
Asked about her plans after BBC Breakfast she said, "Some space to sleep, some time to do other things which I really enjoy. I'm planning some really long swims, and getting back to running after my injury last year, I'm still going back to trying to run marathons."
During her time on the show, Minchin has covered global news stories including three general elections, Brexit, the Covid-19 pandemic, the Manchester bombings and the aftermath of the Bataclan Theatre attacks live from Paris.
Among the famous names she has interviewed are Sir David Attenborough, the Duchess of Cambridge and Billie Eilish, as well as the leaders of the UK’s main political parties.
In 2019 she hosted the Wake Up To Menopause campaign after detailing how she suffered hot flushes while hosting live, and took up endurance sport after competing in a BBC Breakfast Christmas cycling challenge.
Minchin, who shares two daughters with husband David, has since competed internationally for the GB triathlon team in her age group.
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