Ellie was visiting a family who have been photographing their farming life for generations, with the images making up an important part of promoting their business.
Filming on the Jurassic Coast, the weather quickly took a turn for the worst.
Ellie said: "The plan was for me to have a go at bouldering, which is a climbing discipline without ropes, but it's not looking great.
"Let's see what instructor Claire thinks my chances are."
BBC
Countryfile: Ellie Harrison DEVASTATED as she is forced to cancel climbing segment
So more worried about the health of the rock than my own safety?
Ellie Harrison
Bouldering instructor Claire said: "Basically none. It's really really wet. You can't climb on this rock when it's wet because of the erosion.
"You can see here where it's peeling on these paler patches, where it has been climbed on when it's been slightly damp and it just erodes the top layer away.
"As soon as this top layer's gone, you can see it's a lot paler underneath. That's a lot softer. Then it's going to keep eroding and keep eroding and then it can't be climbed on any more."
Disappointed, Ellie noted: "So more worried about the health of the rock than my own safety?"
BBC
Countryfile: Ellie Harrison is shown the erosion
Adventurous Countryfile presenter Ellie Harrison
Thu, August 4, 2016
We've taken a look at Countryfile presenter Ellie Harrison and her adventurous, nature-filled life.
Play slideshow
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Presenter Ellie Harrison and John Hammond during the photocall to open BBC Countryfile Live at Blenheim Palace
"Pretty much. Yes. It is all about looking after the rock," replied Claire, before Ellie continued: "Brilliant. And I wore my jazzy leggings especially."
Keeping the mood light, Claire added: "They are amazing, but I'm sorry that they're not going to get a chance to go on the rock."
Ellie continued: "There is a reason why I'm wearing these. I wouldn't normally go for them."
Countryfile continues next Sunday on BBC One at 6:30pm.
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