Witney's Somerfield supermarket relaunches on May 7, after a £1.4m investment.
The High Street store is also creating 17 new jobs.
The refurbishments include redecoration, extra lighting, more express tills and a larger selection of frozen and chilled products.
The investment follows speculation, based on a consultants' retail report commissioned by West Oxfordshire District Council, that the store could close if a superstore were to be built in Witney town centre.
The improvements are part of a £75m programme by Somerfield, which has 590 stores.
The cutting of the ribbon to relaunch the Witney shop will be carried out by the Little Oak pre-school, which received a £1,000 donation from the company.
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