From Longman Dictionary of Contemporary Englishlow seasonˈlow ˌseason noun [uncountable] British English DLTBthe time of year when fewer people are on holiday and there is less business for hotels etc, and prices are usually lower than normal SYN off-season OPP high season
Examples from the Corpus
low season• Lots of different sports are available, although some sports may be limited during low season and are subject to weather conditions.• A week's accommodation costs between £15 in low season and £48 a person.• The lowest fare is £309 midweek, low season.• The lowest through fare from London straight to Redding is £385 midweek, low season.• Many hotels offer discounts for stays of 3 nights or more, especially in the low season.From Longman Business Dictionarylow seasonˌlow ˈseason [singular]COMMERCETRAVEL the time of year when there is the least business for hotels, shops etcSYNOFF-SEASONSome of the resort’s facilities will be limited during low season.Many hotels offer discounts, especially in the low season. → season 