The Stephensons single-decker was a mile off the local bus route and must have been driven down a farm track, said farmer James Mizen.
Mr Mizen said a bus mechanic knocked at the door of his Thaxted, Essex, farmhouse to tell him a vehicle was stuck on the property.
Stephensons declined to comment on the incident. It is understood the bus did not have passengers at the time.
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Mr Mizen said: "The mechanic said the bus was on our muck heap.
"He must have gone down a no-through road, down a single track road, ignored the 'no unauthorised vehicles' sign and then down our farm track before stopping at the muck heap.
"Apparently there had been a road closure and one of his colleagues told him to take a right, which he did.
"It doesn't seem there was much common sense at play. The further he was getting the more awkward it was going to get for him.
"We don't even like taking our tractor right down to the muck heap, never mind a commercial bus."
Mr Mizen and his brother Chris used a tractor to tow the bus free.

The Northern Ireland Rare Disease Partnership aims to give sufferers and their carers an independent voice.
The group, created with the Patient Client Council, aims to improve treatment and care for those affected by rare diseases.
Jane Stewart is one woman who hopes that the new partnership will help families like hers.
She suffers from Spondylo Ephysial Dysplasia (SED) - a genetic condition which her young son, Saul, has inherited. It is a form of restricted growth or dwarfism.
"I wouldn't change myself or my son or children like him for the world. But I would change the world for them," she said.
"I feel a partnership for rare disease is going to be extremely useful for families like ours living with a rare condition.
"In the information that I have about the rare disease partnership, the focus is on education, provision of special services and support."
Richard Dickson from the Patient Client Council said: "This partnership aims to be a voice for those people scattered across Northern Ireland affected by rare disease with no other means to speak up for themselves."
The partnership will lobby and advocate on their behalf.

It comes after Camden residents tried to save the St James' Gardens site, close to London Euston, which was a burial ground from 1790 until 1853.
Local church warden Dorothea Hackman said it was "quite outrageous" they were going to "dig up our dead".
HS2 Ltd said the work would be done with "dignity, respect and care".
Notable people buried in the gardens include Capt Matthew Flinders, the first person to circumnavigate and name Australia, and Bill Richmond, one of the first black boxers.
"[These people] shouldn't be disturbed by spurious activities like this," said Ms Hackman, who helped organise the service, which was expected to be attended by 40 people.
"And just think of the detrimental effect removing the benefit of the trees and green space will have on the area in terms of air quality.
"There has not been destruction on this scale since the Sixties. Government has run roughshod over democracy."
Resident Marian Kamlish, 92, said that "in times of austerity", such a "vanity project" was an insult to those who work for the likes of the NHS, fire and police forces.
HS2 Ltd will excavate sections of the burial ground to enable it to plan the removal of the remains prior to their subsequent re-interment elsewhere.
A spokesman stressed the grounds had not been in use for more than a century.
"We will ensure that we treat the site with dignity, respect and care," he said.
"As such, we will continue to work closely with the local community, the Archbishops' Council, the local parish, Historic England and other organisations as we proceed with the next phase of the project."
In February, Parliament granted powers to build Phase 1 of the line - between London and Birmingham - which is due to open in December 2026.
In June, the Department for Transport (DfT) said First Trenitalia West Coast, MTR West Coast Partnership and West Coast Partnership had all been shortlisted to operate the service on the line.
A bus ended up stuck in a manure heap after apparently taking a wrong turn.
[NEXT_CONCEPT]
A new organisation has been set up in Northern Ireland to support people who suffer from rare diseases.
[NEXT_CONCEPT]
A memorial service has been held for 60,000 people whose remains are due to be exhumed in London as part of the Â£55.7bn HS2 high-speed rail project.