Wiktionary
n. In the tourist industry, the period of highest demand.
WordNet
n. the season when travel is most active and rates are highest; "they traveled to Europe in high season" [syn: high season] [ant: off-season]
Wikipedia
Peak Season is an MTV Canada reality TV show set in Whistler, British Columbia. The premier was on October 19, 2009, and delivered the highest ratings for a series on MTV Canada. The show follows the lives of several young adult characters in the reality television style. The show concluded its first season December 14, 2009, aired on MTV Canada on Monday nights at 10 p.m. EST, and was followed by The After Show.
Usage examples of "peak season".
People have to make reservations months in advance to get space on a commercial river raft during peak season.
Even the winters weren't too bad, for those tolerant of heavy snowfall, and Hemlockians resigned themselves to a partial dependence on tourists in search of peak season vacations.