College football prediction markets generated approximately $790 million in notional trading volume during the first four days of the 2026 NCAA season, highlighting the growing role of event contracts in sports-related trading.
Data compiled by Aldrin Research showed activity from Thursday through Sunday reached the figure across prediction market platforms. Sports and combination contracts accounted for about 80% of total prediction market volume during the period.
Kalshi recorded the largest share of the activity. Its overall trading volume reached $7.3 billion during the four-day period, giving the platform 86.6% of prediction market trading. College football accounted for approximately $582.1 million of that amount.
The platform also set a new single-day record on Saturday, September 5, when total trading reached $2.29 billion. Sports and combination markets represented $2.02 billion. College football contributed nearly $250 million, or about 11% of Kalshi’s activity for the day.
The Saturday figure represented an increase of almost 300% compared with college football trading on the corresponding Saturday during Week 1 of 2025. Prediction market offerings and their reach were more limited at that time.
Georgia Tech-Colorado Sets the Week 1 Pace
Saturday produced the largest single-day college football volume of the opening weekend. According to Covers, NCAA football contracts generated $318.6 million, which was 95% higher than the $164 million attributed to Friday’s MLB slate.
The Thursday night meeting between Georgia Tech and Colorado produced the highest individual game volume during Week 1, excluding the Monday night Florida State-SMU game. The matchup generated $53.7 million.
That figure was substantially above the largest college football market from Week 1 of 2025. Notre Dame-Miami generated approximately $20 million last year.
Seven games during the 2026 opening week exceeded the $20 million level. Boise State-Oregon reached $37.1 million, with Kalshi accounting for 88% of its volume. Clemson-LSU followed with $35.9 million.
Baylor-Auburn and Western Michigan-Michigan also surpassed $20 million. Friday’s San Jose State-EMU and Thursday’s UMass-Rutgers games reached the same threshold.
Western Michigan-Michigan also produced an unusual settlement issue. Kalshi paid Western Michigan winners before officials had formally settled the market. Referees subsequently added one second to the clock, allowing Michigan to score on a Hail Mary and win 13-12. Kalshi then reimbursed Michigan traders.
Kalshi Leads as Polymarket Faces Disruption
Kalshi held a substantial lead across the four-day period, while Polymarket recorded $58.7 million in college football volume.
Polymarket experienced an unexpected platform shutdown during much of Saturday’s college football schedule. Deposit and trading functions remained unavailable for several hours, affecting its share of activity.
The platform represented 16.8% of Thursday’s college football trading and 19.1% on Friday. Its share dropped to 4.6% on Saturday and then to 2.1% on Sunday, despite the service returning before Sunday’s smaller schedule of games.
The disruption allowed DraftKings Predictions to move into second place for Saturday’s college football trading. It generated $21.1 million, representing 6.6% of the day’s volume. Novig followed with 6.3%, while Crypto.com accounted for 2.2%.
Sunday’s college football markets produced only $8.2 million. Novig captured 75% of that volume, while Kalshi held 19.7%.
DraftKings also ranked third on Thursday, when college football generated $135 million. Its $7.7 million represented 5.7% of the day’s total. Novig recorded 3.5%, placing fourth.
Friday’s college football volume reached $111 million. Kalshi held 69.9%, while Novig recorded 4.3%, behind Polymarket and ahead of DraftKings Predictions at 3.5%.
Underdog represented about 1% of total prediction market volume across the four-day period after shutting down its fantasy contests in seven games during the week.
Prediction Markets Draw Wider Scrutiny
The surge in college football trading comes as prediction markets face increased attention over their role in sports.
Traditional gaming interests have raised concerns about sports event contracts competing with regulated sportsbooks. The American Gaming Association has estimated that Americans will legally wager $29.5 billion on the 2026 NFL season through regulated commercial sportsbooks, compared with $29.4 billion in 2025.
The AGA has attributed part of the slowdown in sportsbook growth to the expansion of prediction markets. Other analysis has also pointed to strong expected growth in NFL-related trading during the 2026 season.
The college football figures demonstrate the scale already being reached during a major sporting weekend. Kalshi alone recorded $582.1 million in college football trading across the four-day period, while Polymarket added $58.7 million.
MLB and tennis, including the ongoing US Open, ranked above college football at points during the opening weekend. Neither sport approached the volume generated by Saturday’s NCAA schedule.
The Week 1 college football schedule concludes with Florida State against SMU on Monday night, leaving the final opening-week total dependent on that market’s activity.