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High season is generally Dec. 15th to April 15th with April 16 - Dec. 14th being low season. Some hotels may start the high season a week later and/or end it a week later.
There is a second "high" season in Hawaii when school's out from mid-June to Labor Day. My favorite times to travel to Hawaii are during the low seasons - mid-April to mid-June and mid-September to mid-December.
Mary, If you are talking about price the there is one high season - Dec. 15 - Apr. 14th and one low season - Apr. 15 - Dec. 14th. It is definitely more crowded in Hawaii during summer but the prices do not change from the low season prices.