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Many factors influence the river ice breakup, such as air temperature, ice thickness, snow cover, wind, water temperature, and depth of water below the ice. Generally, the Tanana river ice breaks up in late April or early May (historically, April 20 to May 20).

What is the Nenana Ice Classic? The Ice Classic is Alaska's greatest guessing game! In Nenana during1917 a group of engineers surveying for the Alaska Railroad bet $800 putting in their guesses when the river would break up.

Mar 28, 2023 · In Nenana, the Nenana Ice Classic organization measures the ice with greater frequency as spring arrives in the north. The guessing game, which has prizes, is to wager when ice will flow out and tip the tripod set up on ice at the Tanana River at Nenana. Last year’s tripod tipped over on May 2.

2024 Ice Measurements: January 29 - 37.5 Inches. February 17 - 42 Inches. February 24 - 44 inches. March 3 - 49 Inches. March 10 - 50 Inches. March 17 - 48 Inches. March 23 - 50 Inches. March 31 - 44 Inches. April 4 - 50.5 inches. April 8 - 50 inches. April 12 - 43 Inches

Apr 12, 2024 · Prior to 2024′s iteration of Alaska’s annual guessing game, thickness hadn’t hit 50 inches since 2013, according to Nenana Ice Classic data. That year, the tripod traveled its fabled 100 feet to trip the clock on May 20 at 2:41 p.m.

The Tanana River at Nenana usually freezes between October and November, reaching an average peak thickness of 41 inches (104 cm) on April 1. The ice then melts on top due to weather and bottom due to water movement.

The Tanana river in the Interior of Alaska usually freezes over during October and November. The ice continues to grow throughout the winter accumulating an average maximum thickness of about 110 cm, depending upon winter weather conditions.

May 9, 2023 · The Nenana Ice Classic is organized by residents of Nenana, who install the tripod and clock system every year. The plot below shows the day of break up for each year of the time series (1917-2023). Data is plotted as decimal days of year to avoid a shift in leap years.

As of April 1, 2021, there were 45.3 inches of ice on the Tanana River, according to the Nenana Ice Classic webpage. That’s almost four feet of ice, but it’s nowhere near the highest amount since 1989.