A nursery school in Lincoln has been rated "outstanding" by Ofsted for the fourth time.
Inspectors have published their report on St Giles Nursery, in Addison Drive, after visiting in July.
Patricia Bradwell, Lincolnshire County Council's executive councillor for children's services said it was, to the best of her knowledge, the only school to achieve such an accomplishment.
She said: "This is a superb achievement by the nursery school.
"We can't remember any other that has achieved four consecutive outstanding reports and if not the only school to achieve this feat, it is certainly one of the few.
"We currently have four outstanding nursery schools in the county but St Giles has continued to excel."
Sarah McEwan, a senior teacher at the nursery, said the fourth outstanding rating was testament to the hard work carried out at the nursery.
She said: "It's such a rare and fantastic thing. The first outstanding Ofsted rating we got was back in 2001 so that's a lot of years of outstanding provision for the children here.
"Everyone is absolutely delighted with the result and it's a good reflection of how hard everyone works and how much the children enjoy learning."
In the report, lead Ofsted inspector Rajinder Harrison said staff and governors were dedicated to the children and their families.
She said: "Children make exceptional progress because the school fosters their love of learning through its high quality provision for teaching and the curriculum.
"Excellent care and support arrangements ensure all children thrive and flourish in this calm, productive environment.
"The school is very ambitious for its families and aspirations among children are high.
"One four-year old said they wanted to be a lawyer while another wanted to be a fireman.
"The school is at the heart of the community. Parents and carers say that they feel fully involved in their children's learning and in the life of the school."
Pupils, parents, staff and governors will celebrate the remarkable achievement, with a week of activities starting on Monday, October 8. Music, circus skills and theatre workshops will take place during the week, with class-based activities and projects tailored to children's individual interests.