The fire broke out Friday outside the northeastern municipality of La Bisbal d'Emporda, near a picturesque coastline usually full of holidaymakers this time of year.
It has reduced around 2,200 hectares (8.5 square miles) of forest to ash, the regional fire service said in a statement. But they have controlled more than two thirds of the blaze.
Hundreds of firefighters worked through the night and "have stabilised around 70 percent of the right flank of the fire".
"Now the objective is to consolidate before the winds change, which is forecast for midday," it added.
No injuries have been reported.
Catalonia regional emergency services said around 150 people had been evacuated, including about 70 children, from a holiday camp.
Spain is on the front line of climate change, which scientists say increases the intensity, frequency and duration of the extreme heat that fuels wildfires.
Deadly wildfires devoured almost 400,000 hectares of land last year, the highest figure recorded for the country by the European Forest Fire Information System.
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