low season

US /ˈloʊ ˌsiː.zən/
UK /ˈloʊ ˌsiː.zən/
"low season" picture
1.

the time of year when a particular tourist destination or activity is least popular and prices are lowest

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Traveling during the low season can save you a lot of money on flights and accommodation.
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The hotel offers special discounts during the low season.
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high seasonpeak season
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seasonseasonalseasonedseasoninglowpeak seasondry season