In short: next mayor markets are long-dated bets on two stages, candidate selection and the vote itself. In London and New York City, the winner is often decided as much by who gets on the ballot as by the campaign. A good strategy prices both stages.
Know the calendar and the system
| City | Next scheduled election | Voting system |
|---|---|---|
| London | May 2028 | First past the post (since 2024) |
| New York City | November 2029 | Ranked-choice primaries, then a general election |
The Greater London Authority runs the London mayoralty; the NYC Board of Elections runs New York's contests. Check both for official dates.
Stage 1: Price the selection
Years out, the real question is who the parties will pick. Ask:
- Will the incumbent run again, or is the seat open?
- How do parties choose candidates, and who controls that process?
- Are there high-profile figures likely to enter late?
A candidate at 0.10 to be mayor might really be a 25% chance to be selected times a 40% chance to win if selected.
Stage 2: Price the vote
Once candidates are set, the voting system matters:
- First past the post (London): a candidate can win with a plurality, so vote splitting among rivals is key.
- Ranked-choice primaries (NYC): second and third preferences can overturn a first-round lead, so early polls can mislead. Our article on Polymarket political markets shows how NYC markets reacted during the last race.
Strategy: patience over prediction
- Avoid locking up capital too early. Long-dated markets can tie up money for years with little movement.
- Look for overreactions to single polls or viral moments; see contrarian trading.
- Use polling averages, not single polls; our guide to polls vs prediction markets explains why.
- Size small with a clear bankroll plan.
Availability
The UK is listed as restricted for Polymarket on our country pages, and US access goes through Polymarket US in supported states. Check the rules where you live and only risk money you can afford to lose.
Next step
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