The firm, which operates the Blacks and Millets chains, said like-for-like sales during its key camping season of July and August were so far 6.1 per cent ahead of last year.
With holidaymakers gearing up for the school holidays and music fans heading to festivals, the two months account for a fifth of annual sales.
Chief executive Neil Gillis said camp sites were reporting bookings up 10 per cent up this year as high fuel prices put holidaymakers off heading abroad.
He said: "Our sales rise has almost entirely been driven by camping. What we are seeing now is a lot more people taking holidays in the UK."
Despite the recent boost, Blacks' overall sales were down 5.4 per cent during the 19 weeks to July 12.
Sales for its outdoor arm dipped 2.2 per cent, while overall performance was dragged down by its surf wear arm Freespirit and O'Neill which reported a 15.5 per cent decrease.
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