When does Avengers: Doomsday come out?

Avengers: Doomsday is scheduled to release in US theaters on Friday, December 18, 2026. Marvel Studios and Disney are co-distributing. The Russo brothers (Anthony and Joe Russo) directed; the cast includes Robert Downey Jr. as Doctor Doom plus an Avengers ensemble.

What's the prediction market saying about the opening weekend?

As of April 2026, Kalshi's 'biggest opening weekend of 2026' market priced Avengers: Doomsday at roughly 79-80% YES, with $1.4M in volume and deep liquidity on the contract resolving December 31, 2026. Polymarket has the same market priced at lower probability because Spider-Man: Brand New Day pulls competing volume on the annual gross.

Can Californians legally trade movie box-office contracts?

Yes. Kalshi's box-office event contracts are CFTC-regulated and legal in all 50 states, including California. Polymarket relaunched US access in 2025 and is rolling out coverage. Both are accessible to California residents under federal commodities law, just like sports and political markets.

How does Doomsday compare to past Avengers openings?

Avengers: Endgame opened to $357M domestic in April 2019 — the all-time MCU record. Avengers: Infinity War opened to $258M. Long-range tracking from BoxOfficePro and similar outlets projects Doomsday to land between Infinity War and Endgame, with $250-300M as the consensus range. A blowout above $300M would set up a new MCU peak.

What's the biggest risk to the trade?

Three things: weak reviews from early screenings (the Russo brothers have a mixed post-Endgame track record); a worse-than-expected Thanksgiving box office that signals theatrical weakness; or a competing tentpole over-performing in the same window. December 25 brings Avatar 4, but the gap between the films should let both perform.

Where can I trade this from California?

Kalshi has the deepest opening-weekend and annual-gross markets. Polymarket has the same contracts with US users now back online. Both are CFTC-regulated event-contract platforms legal for California residents.

When will markets be most liquid?

Three windows: the first official trailer drop (typically 6-8 weeks before release), the Thursday-night previews on December 17, and the resolution weekend itself. Volume on Lines.com-tracked Kalshi markets has stayed deep through April with $1.4M lifetime; expect 5-10x that by release.

How do I read the price?

A Kalshi contract trading at 79¢ means the market thinks there's a 79% chance Doomsday has the biggest opening weekend of any 2026 film. If that resolves YES, each contract pays $1. If NO, it pays $0. Your max loss is the price you paid.

Entertainment·8 min read

Avengers: Doomsday Opening Weekend: How to Trade the Biggest Movie of December 2026

By Catie Di StefanoPublished April 20, 2026Updated July 16, 2026

Avengers: Doomsday opens December 18, 2026. Kalshi and Polymarket are already pricing the opening weekend, the annual gross, and whether the Russo brothers can deliver Marvel's biggest debut since Endgame. Here's how to take a real position from California.

FeaturedKalshi Polymarket

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Avengers: Doomsday Opening Weekend: How to Trade the Biggest Movie of December 2026

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Frequently asked questions

When does Avengers: Doomsday come out?: Avengers: Doomsday is scheduled to release in US theaters on Friday, December 18, 2026. Marvel Studios and Disney are co-distributing. The Russo brothers (Anthony and Joe Russo) directed; the cast includes Robert Downey Jr. as Doctor Doom plus an Avengers ensemble.
What's the prediction market saying about the opening weekend?: As of April 2026, Kalshi's 'biggest opening weekend of 2026' market priced Avengers: Doomsday at roughly 79-80% YES, with $1.4M in volume and deep liquidity on the contract resolving December 31, 2026. Polymarket has the same market priced at lower probability because Spider-Man: Brand New Day pulls competing volume on the annual gross.
Can Californians legally trade movie box-office contracts?: Yes. Kalshi's box-office event contracts are CFTC-regulated and legal in all 50 states, including California. Polymarket relaunched US access in 2025 and is rolling out coverage. Both are accessible to California residents under federal commodities law, just like sports and political markets.
How does Doomsday compare to past Avengers openings?: Avengers: Endgame opened to $357M domestic in April 2019 — the all-time MCU record. Avengers: Infinity War opened to $258M. Long-range tracking from BoxOfficePro and similar outlets projects Doomsday to land between Infinity War and Endgame, with $250-300M as the consensus range. A blowout above $300M would set up a new MCU peak.
What's the biggest risk to the trade?: Three things: weak reviews from early screenings (the Russo brothers have a mixed post-Endgame track record); a worse-than-expected Thanksgiving box office that signals theatrical weakness; or a competing tentpole over-performing in the same window. December 25 brings Avatar 4, but the gap between the films should let both perform.
Where can I trade this from California?: Kalshi has the deepest opening-weekend and annual-gross markets. Polymarket has the same contracts with US users now back online. Both are CFTC-regulated event-contract platforms legal for California residents.
When will markets be most liquid?: Three windows: the first official trailer drop (typically 6-8 weeks before release), the Thursday-night previews on December 17, and the resolution weekend itself. Volume on Lines.com-tracked Kalshi markets has stayed deep through April with $1.4M lifetime; expect 5-10x that by release.
How do I read the price?: A Kalshi contract trading at 79¢ means the market thinks there's a 79% chance Doomsday has the biggest opening weekend of any 2026 film. If that resolves YES, each contract pays $1. If NO, it pays $0. Your max loss is the price you paid.