Fire and rescue services have been rushed to Balmuildy Primary School in Bishopbriggs.
The alarm was raised amid fears of a gas leak within the school shortly before noon.
Parents of children at the school have been urged to collect them "asap" while emergency crews deal with the incident.
In a text message seen by the Glasgow Times, the school sent a text message to all parents to inform them of the evacuation.
It reads: "Balmuildy Precautionary measure school evacuated, children walked to the Leisuredrome.
"Pick up your child ASAP."
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A spokewoman for the Scottish Fire and Rescue Service confirmed: "We were alerted at 11.41am on Thursday, February 20 to reports of a gas alarm activation at Balmuildy Primary School in Bishopbriggs, Glasgow.
"Operations Control mobilised two fire appliances and specialist resources and the school has been evacuated as a precaution.
"Crews currently remain in attendance."
East Dunbartonshire Council earlier confirmed that the school was evacuated and pupils were taken to the Leisuredrome to keep them safe and warm during the poor weather conditions.
An investigation has since been launched into the incident, which has resulted in the school having to remain closed tomorrow.
Ann Davie, Depute Chief Executive for Education People & Business said: "We take any concerns in relation to health and safety very seriously.
"Following the precautionary evacuation at Balmuildy Primary School earlier today, investigations are continuing and the decision has been taken to keep the school closed tomorrow (Friday 21 February) for these to be concluded.
"The school community has been advised and a further update will be provided over the weekend."
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