The 2026 MLB postseason opens in the first week of October, with the World Series running late October into early November. Both the Astros and Rangers have live championship contracts on Kalshi and Polymarket, and the sharpest pricing window is the last two weeks of September, when seeding resolves.
The two Texas clubs
The deepest Texas baseball market by volume. Division-winner and World Series contracts both list; the division market is usually the more efficient fill.
Thinner book, wider spread. Worth watching around the trade deadline, when a buyer's move can reprice the contract several cents in a day.
Price bands are historical context, not a live quote — check the exchange before trading.
How MLB contracts settle
A World Series contract resolves at $1.00 for the winning club and $0.00 for everyone else, settled within 24–72 hours of the final out on the official MLB result. Because you can sell before settlement, a team that rallies into October can be exited at a profit without ever winning the title — the main structural advantage over a sportsbook futures ticket. Fee mechanics: Kalshi fees explained.
October dates to trade around
- Late September — seeding and tiebreakers; largest single liquidity spike of the season.
- Wild Card round, early October — three-game series, highest variance, fastest repricing.
- Division Series & LCS, mid-October — contract prices converge toward the four survivors.
- World Series, late October — two teams left; per-game markets carry the most volume.
Trading baseball legally from Texas
Texas does not license sportsbooks, so DraftKings and FanDuel are out. Kalshi's sports event contracts are CFTC-regulated federal derivatives, which is a different legal category and available statewide to adults 21+. Background: are prediction markets legal in Texas? and how to use Kalshi from Texas.