Cardinals vs Rockies Prediction Market Odds, September 6, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
Cardinals | — | — | 100%100% | 100% Kalshi |
Rockies | — | — | 0% | — |
| Spread | Total | Moneyline | Best ML | |
|---|---|---|---|---|
St. Louis Cardinals | — | — | 100%100% | 100% Kalshi |
Colorado Rockies | — | — | 0% | — |
St. Louis and Colorado split the first two games at Coors Field, and the rubber match is priced as a modest road favorite. As of the morning of September 6, 2026, the Cardinals sit at 56c on both Kalshi and Polymarket and the Rockies at 45c on both books, a rare case of the two exchanges agreeing to the cent on every leg of the moneyline. Kyle Leahy (10-4, 3.13 ERA) starts for St. Louis (71-72) against Tanner Gordon (1-4, 5.18 ERA) for Colorado (55-87), with first pitch at 3:10 PM ET.
St. Louis and Colorado are tied 1-1 in this Coors Field series after a 7-6 Cardinals win on Friday and a 10-7 Rockies win on Saturday, so this is the rubber game. Kyle Leahy takes the ball for St. Louis at 10-4 with a 3.13 ERA against Tanner Gordon, who is 1-4 with a 5.18 ERA. First pitch is 3:10 PM ET (1:10 PM MT) on Sunday, September 6, 2026, a time confirmed by both the Kalshi event ticker and the ESPN scoreboard. The Cardinals are 71-72 overall and 37-34 on the road, which is their better half; the Rockies are 55-87 and 30-40 at home.
Cardinals vs Rockies Market Context
The board is unusually tidy. As of the morning of September 6, 2026, St. Louis prices at 56c on Kalshi and 56c on Polymarket, and Colorado at 45c on both, so the cross-platform spread on this moneyline is zero. The two sides sum to 101c, which is about as tight a two-sided book as a low-volume regular season game produces. There is no value gap to trade between the exchanges here; the disagreement, such as it is, sits on the alt market rather than the winner.
That alt market is the first inning run contract, which asks whether either team scores in the top or bottom of the first. It prices at 56c on Kalshi and 54c on Polymarket for a 55c average, the only 2c cross-platform gap on the board. At a park where the Rockies have played to a 30-40 home record while giving up runs in bunches, a first inning run priced near a coin flip is the one line on this page that carries a real read rather than a consensus.
Movement has been quiet. Across the snapshots captured between midnight and 5:45 AM ET on September 6, the Cardinals leg traded in a one cent band between 55c and 56c and the Rockies leg between 45c and 46c, with no directional drift in either direction. That is the full extent of the captured window on this board, so it says nothing about where the line opened days ago, only that overnight trade did nothing to it. Lifetime volume across both platforms is roughly $37, which makes this a thin book: the price is informative because it matches the independent reads, not because size is defending it.
Those independent reads line up closely. The Cardinals are a -135 road favorite at DraftKings against +112 on Colorado, which strips down to roughly 55% for St. Louis once the vig is removed, and the ESPN matchup predictor puts St. Louis at 58.1%. The prediction market's 56c sits between the two. A trader who wants a differentiated view on this game has to build it off the pitching or the park, not off a mispriced board.
Leahy vs Gordon: The Cardinals vs Rockies Pitching Matchup
Leahy is the reason St. Louis is favored on the road in Denver. A 3.13 ERA with a 10-4 record is the best starter either side has run out in this series, and the Cardinals have needed it, having gone 71-72 while their playoff market sank to 7c on Kalshi. Gordon, at 1-4 with a 5.18 ERA, is the softer half of the matchup, and a 5.18 ERA earned partly at altitude still prices as a run-scoring environment for a Cardinals lineup that put 13 runs on the board as recently as September 2.
The lineups are thinner than the records suggest on both sides. St. Louis is without Masyn Winn, JJ Wetherholt and Everson Pereira, all on the 10-day injured list, which pushes more of the offense onto Jordan Walker (.286, 28 home runs) and Alec Burleson (102 RBIs). Colorado is missing Kris Bryant on the 60-day list and Kyle Freeland on the 15-day list, leaving Hunter Goodman (36 home runs, 76 RBIs) as the bat that decides whether the Rockies chase Leahy early. Goodman is the single player most likely to move this price in game, because a Coors Field lead built on one swing changes a 56c line faster than anything on the pitching side.
The run environment is the other half of the read. DraftKings has this at a total of 11 runs with the run line at St. Louis -1.5 (+110), numbers that only exist in Denver. The prediction market board does not carry a spread or total for this game, so the moneyline and the first inning contract are the two tradeable expressions of that view here. A total of 11 alongside a 55c first inning run price is a coherent pair: the books expect scoring, and they expect some of it early.
When the Cardinals vs Rockies Market Resolves
The moneyline resolves to the team that wins the game outright at Coors Field on September 6, 2026, with first pitch scheduled for 3:10 PM ET. Extra innings count, and the winning contract pays $1 per share while the losing side settles at zero. Kalshi and Polymarket both settle off the official final score, typically within minutes to a few hours of the last out. The first inning run contract settles on whether either team scores in the first inning, resolved as soon as the second inning begins.
Key Cardinals vs Rockies Catalysts
Starting pitching gap: Kyle Leahy (10-4, 3.13 ERA) against Tanner Gordon (1-4, 5.18 ERA) is the widest edge on the card and the reason a 71-72 team is favored on the road.
Hunter Goodman at the plate: Colorado's leader with 36 home runs and 76 RBIs is the fastest path from 45c to a live Rockies price.
Coors Field scoring: a DraftKings total of 11 runs and a 55c first inning run market both point at an early scoring environment, which cuts against holding a small lead.
Series stakes: the set is tied 1-1 and St. Louis leads the season series 3-2, so the winner takes both the series and the head to head.
Injury load: Masyn Winn and JJ Wetherholt are out for St. Louis, and Kris Bryant and Kyle Freeland are out for Colorado, thinning both benches for a getaway day game.
Book agreement: Kalshi and Polymarket both post 56c on St. Louis, so the books have no disagreement on the winner, only on the first inning contract.
Related Cardinals vs Rockies Markets
The season-long context for this game trades on two boards: Cardinals 2026 playoff odds, which sits at 7c on roughly $135K of volume, and Rockies 2026 playoff odds at 1c. The division picture behind both is on the 2026 NL Central market. For the previous game of this series, see the September 5 Cardinals at Rockies board, and for the full schedule of live boards on each club, use the St. Louis Cardinals hub and the Colorado Rockies hub. Every game on the slate is indexed at the MLB league page.
Resolution Criteria
Resolves to the team that wins the game between the St. Louis Cardinals and the Colorado Rockies at Coors Field on September 6, 2026, scheduled for 3:10 PM ET. The winning team's contract pays $1 per share and the losing team's contract resolves to zero. Extra innings are included, and the official final score published by Major League Baseball is the source of truth on both Kalshi and Polymarket. The separate first inning run contract on the same board resolves YES if either team scores in the first inning and NO otherwise. If the game is suspended or postponed, each platform applies its own rule: a game completed on a later date generally settles on the final result, while a game that is not completed voids and refunds.
Key Factors
- Kyle Leahy (10-4, 3.13 ERA) starting for St. Louis against Tanner Gordon (1-4, 5.18 ERA) for Colorado
- Hunter Goodman (36 HR, 76 RBI) is the Colorado bat most likely to move a 45c price
- Coors Field run environment against a DraftKings total of 11 runs and a 55c first inning run market
- Series tied 1-1 after a 7-6 St. Louis win and a 10-7 Colorado win, with St. Louis up 3-2 in the season series
- Masyn Winn and JJ Wetherholt out for St. Louis, Kris Bryant and Kyle Freeland out for Colorado
- Kalshi and Polymarket both at 56c on St. Louis, leaving the only 2c cross-platform difference on the first inning contract
What are the current Cardinals vs Rockies odds?
As of the morning of September 6, 2026, the St. Louis Cardinals price at 56c on both Kalshi and Polymarket and the Colorado Rockies at 45c on both books. The live board above carries the current prices, which move up to first pitch at 3:10 PM ET.
Where can I trade the Cardinals vs Rockies market?
The game trades on Kalshi under the ticker KXMLBGAME-26SEP061510STLCOL and on Polymarket in its MLB event market for September 6, 2026. Both books carry the moneyline, and the board also lists a first inning run contract.
Who is favored in Cardinals vs Rockies on September 6?
St. Louis is favored at 56c, an implied probability of about 56%. That is close to the no vig read of roughly 55% from the DraftKings line of Cardinals -135 and slightly under ESPN's matchup predictor, which gives St. Louis 58.1%.
When does the Cardinals vs Rockies market resolve?
It resolves after the final out at Coors Field on September 6, 2026, with first pitch at 3:10 PM ET. The winning team's contract pays $1 per share, extra innings included, and both platforms settle off the official Major League Baseball final score.
What should I watch before Cardinals vs Rockies resolves?
Watch the first inning run contract, which is the only leg where the books disagree at 56c on Kalshi and 54c on Polymarket, and watch whether Tanner Gordon (5.18 ERA) survives the third. Hunter Goodman's 36 home runs are the fastest route to a live Colorado price.