Centre owner Guy Hughes said this week phones were "buzzing" with parents keen to enrol their children in the former REAP building in Robins Rd.
The centre had a resource consent for 20 pupils at any one time and would cater for children aged 2 to 6 years old.
Most parents would want their children attending for two or three days a week, which meant 35 to 40 families could be involved, Mr Hughes said.
The public opening ceremony will take place on Monday at noon and the centre will open for business on February 1.
Mr Hughes said Ministry of Education compliance staff visited the new school this week and there were only "a couple of little boxes to tick".
"The Montessori resources have arrived and the facility is ready to go. The foundation students and their parents, as well as interested members of the community, are invited to attend."
Montessori has been taught in Arrowtown since 1994.
Mr Hughes said he had always wondered why Queenstown did not have one and decided to open the Robins Rd centre due to the lack of facilities in the Wakatipu.
His daughter was enrolled in a Montessori school in Prague, but there was no room in Arrowtown.
"I bought the Southland REAP house next to my language school and it was already consented for education - including early childhood - which helped get the project off the ground.
"And I encountered some can-do people at Lakes Environmental."
Mr Hughes said Montessori provided an environment, "where the incredible abilities already in children can be unleashed.
"The teacher acts more as a guide to provide the right challenges, materials and environment, as opposed to the traditional teacher force-feeding information."
Arrowtown Montessori founder Miranda Spary visited Montessori teacher Sue Wallace at the Robins Rd centre this week and gave her support.
Ms Spary said she would be very rich if she had a dollar for every person who asked her to open a Queenstown version.
"We had children coming from as far away as Wanaka and Alexandra to attend."
Montessori was "a very peaceful, gentle way for children to learn.
"The Montessori method teaches children how to do things independently - `Teach me to do it by myself' is what children want, whether it's tying shoelaces, pouring water without spilling, learning to write or making scones."
