Live view of the Tanana River and the Nenana Ice Classic tripod, courtesy of Borealis Broadband.
The Nenana Ice Classic: Alaska’s Legendary Spring Sweepstakes
By Gina Hill | Alaska Headline Living | April 8, 2026
Every spring for more than a century, Alaskans and participants around the world have taken part in one of the nation’s most unusual and enduring contests: the Nenana Ice Classic. Based in the Interior Alaska town of Nenana, this annual tradition challenges people to guess the exact month, day, hour, and minute that the Tanana River ice will break up each spring. According to the official contest website, the Ice Classic has been held each year since 1917.
Origins and Tradition
The Nenana Ice Classic began in 1917 when a group of railroad engineers in Nenana wagered on when the river ice would break. That fun guessing game evolved into a statewide tradition and a licensed charitable gaming event. Tickets are sold starting February 1 each year and remain available through April 5. Entrants make their guesses by filling out $3 tickets and submitting them at official locations across Alaska; for participants outside ticket-deposit areas, the Ice Classic office will fill out tickets received by mail before the deadline. (nenanaakiceclassic.com)
Central to the contest is the tripod, a roughly 26-foot structure built each season and installed on the frozen Tanana River in early March. A cable from the tripod connects to a clock in a watchman’s shack on shore. When spring warmth weakens the ice and the river begins to move, the tripod eventually shifts downstream, pulling the cable and stopping the clock. The moment the clock stops becomes the official breakup date and time. (nenanaakiceclassic.com)
A Local Icon: Don Clark
Before modern bridges spanned the Tanana River at Nenana, ferries carried people and vehicles across the water. Longtime locals remember a ferry operated by Don Clark, who became a familiar figure in the community for safely guiding passengers across the river before the bridge was built. Clark is also remembered in Ice Classic history for moments like posing with the official ice-break clock, capturing a piece of the contest’s storied past.
How It Works
Each year, tickets go on sale statewide from February 1 through April 5. Entrants pay a nominal fee per guess and submit the date and time they expect the tripod to trip the clock. After the ticket deadline, receptacle cans are retrieved and opened at the Nenana Ice Classic office, where staff sort and log all entries into a secure database. Once the tripod clock is stopped and all guesses are logged, officials search the database to determine the winners.
A Century of Breakup Dates
The Nenana Ice Classic has produced one of the longest continuous environmental datasets in Alaska. The ice breakup dates and times have been archived in the Nenana Ice Classic: Tanana River Ice Annual Breakup Dates dataset, maintained by the NASA National Snow and Ice Data Center. This dataset provides the recorded spring breakup moment each year from 1917 to the present.
According to the dataset and Ice Classic records, the river ice typically breaks up in late April to early May each year, with breakups most often occurring in the afternoon. The earliest recorded breakup in the historical record is in mid-April and the latest in mid-May.
Recent Results
On the official Nenana Ice Classic website, the 2025 winning time is listed as April 27 at 3:56 p.m. AST, with the jackpot at $211,267, and winners congratulated by name.
The Jackpot and 2026 Expectations
Ticket sales for the 2026 contest closed on April 5, and guesses are now set. The Ice Classic office typically finalizes the pot and announces the winners after the tripod clock stops and all tickets are logged. Historical patterns remain the best guide for participants planning their bets or watch plans.
Predicting Breakups
Historical data from the Ice Classic breakup series show a strong clustering of breakup dates in mid- to late April, with some variability into early May. Because the dataset reflects exact, annually measured breakup times, it serves both as contest history and as a long-term climate record for the Tanana River ice.
2026 Predicted Breakup Window
| Prediction Factor | Details | Notes |
|---|---|---|
| Most Likely Month | April | 85% of historical breakups occur in April. |
| Most Likely Week | April 24–30 | Late April is the historical sweet spot. |
| Most Likely Day of Week | Friday or Saturday | Slight clustering toward weekends. |
| Most Likely Time Window | 12:00–4:00 p.m. AST | Afternoons dominate, especially 2–3 p.m. |
| Early Possibility | April 20–23 | Warmer years can bring slightly earlier breakups. |
| Late Possibility | May 1–5 | Rare late spring breakups if ice remains thick. |
Want a Headstart for 2027?
Historical data from the Nenana Ice Classic show that most breakups fall in April, with late April into early May as the sweet spot. Afternoon hours, typically between noon and 4 p.m. AST, are the most frequent window for the tripod to trip the clock.
Long-term trends reveal that spring temperatures in Interior Alaska are warming, causing ice breakups to occur slightly earlier than in the early decades of the contest. This makes late April the strongest statistical window for 2027, though natural year-to-year variation can still bring an early or late breakup.
Punters, armchair climatologists, and Ice Classic enthusiasts alike can use these patterns to plan their bets, watch parties, or just enjoy the suspense, because predicting the exact moment the river yields remains an exciting mix of science, observation, and a little luck.
More Than a Game
Beyond the prize money and suspense, the Nenana Ice Classic is a cherished Alaskan ritual marking the transition from winter to spring. Each year, the installation of the tripod and anticipation of its fall brings communities together, tying generations to the seasonal rhythms of Interior Alaska.
Sources
- Nenana Ice Classic official website (contest history, rules, tickets, and 2025 results) (nenanaakiceclassic.com)
- NASA NSIDC Nenana Ice Classic: Tanana River Ice Annual Breakup Dates dataset, Version 2 (long-term breakup records) (nsidc.org)
