It includes Salesian College, St Wolstan's Community School and Celbridge Community School.
A new "streamlined" post primary school application system will open from this morning.
It means families in Celbridge will fill out just one form online.
Some parents have criticised the new system as it does not allow them to select schools in order of preference.
The pilot scheme aims to streamline the admissions process.
Celbridge is one of five areas across the country taking part in the trial, alongside Athenry, Clonakilty, Greystones, and Tullamore.
Three schools in Celbridge are participating in the pilot:
Salesian College
St Wolstan's Community School
Celbridge Community School
Under the new system parents and guardians can apply for first year places, including places in special classes.
Parents and guardians only have up until Wednesday 22nd October to fill out the form, which can be found on applytoschool.ie.

Kfm Obituary Notices
Kildare County Council To Host Equine Summit At Curragh Racecourse
Search For Elderly Man Who Entered River Barrow Stood Down As Body Recovered
Project Manager Has Been Appointed To Address Urgent Issues At St. Patrick's Primary School In Celbridge
Kildare SNAs Join National Protest Over Allocation Review
IFA Plan Large Protest This Saturday In Newbridge
Kildare’s Commercial Vacancy Rate Falls To 14.1% – Below National Average
Gardaí Say 'Current' Phase Of Searches Linked To Missing Deirdre Jacob And Jo Jo Dullard Have Ended