State Education Minister N. Samsudheen announced the extension after a meeting in Delhi.
The programme is funded by the central government and implemented by Kerala's Civil Supplies Corporation.
Approximately 905 metric tonnes of rice will be distributed to schools.
Onam kits are provided to help families celebrate the festival without extra cost.
The government also plans measures to control rising food prices in the market.
The scheme, which currently provides free mid‑day meals to children in classes one to eight, will now serve about 2.35 million older pupils.
Each beneficiary will receive four kilograms of rice and an Onam celebration kit containing items such as ghee, cashew nuts, and a range of spices.
The expansion aims to support families during the Onam festival and to keep food prices stable.
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