Russia Duma Election 2026: September 18–20 Voting
The official voting dates, a timestamped snapshot of Polymarket's three State Duma boards, the settlement rules that separate them, and the research checkpoints before Russia's parliamentary election.
Published August 21, 2026 · Election: September 18–20, 2026 · Next planned refresh: ~September 10, 2026
The answer first
Russia's parliamentary election is scheduled for September 18–20, 2026, with the main voting day on September 20 fixed by the presidential decree signed on June 16, 2026. All 450 seats in the State Duma are at stake, with 226 needed for a majority. Polymarket already runs three large boards on this election — a seats-gained board with about $21.34 million in cumulative volume, a winner board with about $3.25 million, and a second-place board with about $348,800. At the August 21 snapshot United Russia traded near 98.6¢ in the winner board but only 70.5¢ in the seats-gained board. The result is unknown. This page records the dates, the snapshot, and the contract rules — it does not turn one quote into an election forecast.
Official Russia 2026 election timeline
United Russia won 324 of 450 seats with 49.82% of the vote, keeping its constitutional majority. More than four parties crossed the proportional threshold for the first time since 2003, with New People entering the Duma. Non-systemic opposition figures described the 2021 results as falsified and unfair.
Alexei Navalny, the leader of the non-systemic opposition, died in prison. Since the 2022 invasion of Ukraine, opposition politicians have faced imprisonment, foreign-agent designations, or exile — context that shapes how markets price a managed electoral field.
President Vladimir Putin signed a decree scheduling the election for September 20, 2026, fixing the legal anchor for the three-day voting window.
Russia's Central Election Commission published the calendar of election-preparation events. Interfax reporting cited a CEC budget of about 27.4 billion rubles, of which more than 23.3 billion rubles is directed to the parliamentary election.
Verified the official dates and the three exact Polymarket events, and recorded the timestamped market snapshot below. Party labels, prices, and statuses are documented as of about 14:00–14:05 UTC.
A planned re-check of the boards, labels, and any CEC calendar changes roughly a week before voting opens, so pre-vote visitors see current data rather than August state.
Voting is scheduled across September 18–20, 2026, with the main voting day on September 20 under the June decree. The reviewed Polymarket events carry an API end time of September 20.
The boards resolve on a consensus of credible reporting, with an official-source fallback. If results are not known definitively by September 30, 2027, 11:59 PM ET, each reviewed market resolves to "Other."
August 21 market snapshot: three boards, three questions
At about 14:00–14:05 UTC on August 21, 2026, all three exact Gamma events were active and not closed. Combined they carried about $24.9 million cumulative volume, roughly $414,000 of 24-hour volume, and about $4.35 million in liquidity — the seats-gained board alone showed $380,832 of 24-hour trading.
Seats-gained board — $21.34M
"Which party will gain most seats in Russian Parliamentary Election?" (event id 149589): about $21,336,444 cumulative volume, $380,832 in 24 hours, $2,415,007 liquidity at the snapshot.
Winner board — $3.25M
"Russia Parliamentary Election Winner" (event id 149565): about $3,254,833 cumulative volume, $13,616 in 24 hours, $1,122,300 liquidity at the snapshot.
Second-place board — $348.8K
"Russia Parliamentary Election: 2nd Place" (event id 403883): about $348,801 cumulative volume, $19,572 in 24 hours, $817,575 liquidity at the snapshot.
Seats-gained board — displayed YES prices
| Party contract | YES price | Contract volume |
|---|---|---|
| United Russia (ER) | 70.5¢ | $7,590,314 |
| New People (NL) | 21.85¢ | $2,234,140 |
| LDPR | 5.5¢ | $3,292,948 |
| Communist Party (KPRF) | 1.15¢ | $1,398,969 |
| A Just Russia – For Truth (SRZP) | 0.25¢ | $1,634,329 |
| Rodina | 0.2¢ | $2,560,210 |
| Yabloko | 0.15¢ | $1,349,472 |
| Civic Platform (GP) | 0.05¢ | $1,276,063 |
Winner and second-place boards — displayed YES prices
| Party contract | Winner board | 2nd-place board |
|---|---|---|
| United Russia (ER) | 98.6¢ | 0.45¢ |
| Communist Party (KPRF) | 0.4¢ | 85.5¢ |
| LDPR | 0.35¢ | 8.75¢ |
| New People (NL) | 0.35¢ | 6.55¢ |
| Yabloko | 0.55¢ | 0.25¢ |
What the three boards actually measure
The interesting part of this event family is that the boards ask three different questions about one election, and their prices legitimately disagree:
1. Winner: most seats won
Resolves to the party that wins the greatest number of the 450 seats. United Russia entered the campaign holding 310 outgoing seats after its 324-seat, 49.82% result in 2021, and traded at 98.6¢ here at the snapshot.
2. Seats gained: most seats added
Resolves to the party that gains the greatest number of seats "compared to before the election" — a different measurement when the ruling party already holds a supermajority. United Russia traded at only 70.5¢ here, with New People — which won 13 seats in 2021 and holds 15 outgoing — at 21.85¢.
3. Second place: the real contest
Resolves to the party finishing second after a defined ranking (seats, then valid votes, then alphabetical abbreviation). KPRF, which holds 56 outgoing seats, traded at 85.5¢, ahead of LDPR (8.75¢) and New People (6.55¢).
A 98.6¢ price in one board and a 70.5¢ price for the same party in another is not a contradiction or an arbitrage gift: the contracts settle on different measurements. Comparing boards without reading their rules is the most common analytical error on multi-board election events. The political prediction markets guide covers this class of mistakes in depth; the election betting odds primer shows how to convert prices into implied probabilities with the same caution.
Resolution rules that matter
1. Consensus, then official fallback
All three boards resolve on "a consensus of credible reporting." If reporting is ambiguous, resolution falls back solely to official Russian government sources such as the Central Election Commission — the body organizing the vote.
2. The Other deadline
If results are not known definitively by September 30, 2027, 11:59 PM ET, each reviewed market resolves to "Other" — a 12-plus-month settlement tail that long-dated position sizing should respect.
3. Tie-breaks are mechanical
Seat ties break first by total valid votes received, then by alphabetical order of the listed party abbreviation. The second-place board applies the same ranking to decide who occupies second position.
4. Coalition accounting
If a listed party contests as part of a joint coalition, its contract represents the whole coalition's seats. If two listed parties merge into one coalition, the contract of the one that won more seats last election represents it.
5. Seats, not vote share
Every reviewed board is decided "solely on the number of seats" won or gained in the State Duma. A party's national vote percentage never directly settles any of these contracts.
6. Save the current wording
Labels, placeholder contracts, and rule text can change before September. A careful research record stores the exact question, description, status, link, and timestamp — not only a screenshot of one price.
Context that shapes the boards
The election takes place in a constrained political environment, and the boards price that. United Russia is the ruling party led by former president Dmitry Medvedev; the systemic opposition parties in the Duma are the CPRF (Zyuganov), LDPR (Slutsky), A Just Russia (Mironov), and New People (Nechayev). The non-systemic opposition is largely imprisoned, designated as foreign agents, or in exile after Navalny's death in custody in February 2024 and the post-2022 wave of repression. Wikipedia's summary of the 2021 election — which independent observers described as neither free nor fair — is the neutral starting point for why market prices assign the ruling party such high winner-board odds. A high price documents what traders expect given the known field and rules; it is not an endorsement of the process or a guarantee of the outcome.
Why demand should rise before September 20
This page was published 28 days before the voting window opens, early enough for search engines to index current dates and data before the demand wave. Search interest for a country's parliamentary election reliably builds in the final three weeks: date checks first, then board prices, then results queries in the days after voting.
Date-first wave
"When is the Russian election 2026" resolves to September 18–20 — a fixed, decree-anchored answer this page states in the title, intro, and timeline.
Pre-vote pricing wave
As nomination and campaign events land in early September, attention shifts from dates to the boards. The September 10 refresh replaces August state with current prices and labels.
Results wave
After September 20, queries turn to outcomes and settlement. The planned post-election record documents how each board actually resolved.
Research workflow for the Russia boards
Start from the official calendar
Verify dates against the presidential decree and CEC calendar reporting (June 16–17, 2026). Do not infer the schedule from a market's API end time or a social post.
Separate the three questions
Write down which board you are reading — winner, seats gained, or second place — before comparing any two prices. Cross-board comparisons without rule checks produce false edges.
Measure, don't skim
Use the prediction-market odds guide to record spread and depth rather than treating the last trade as an exact probability.
Compare fixed calendars
The U.S. midterm hub (November 3), the Brazil election guide (October 4 first round), and this page cover different electoral systems, dates, and contract families — a price on one never mechanically determines another.
Investigate sharp moves
The biggest-movers watchlist can flag a Duma contract for review. It cannot establish whether a move reflects information, thin liquidity, or a single large order.
Keep claims bounded
The prediction-market accuracy guide explains why a quoted probability is evidence to assess, not certainty. No board is guaranteed to settle as today's price implies.
Frequently asked questions
When is the Russian parliamentary election in 2026?
Voting is scheduled for September 18–20, 2026, with the main voting day on September 20 fixed by the presidential decree signed on June 16, 2026. Russia's Central Election Commission published its election-preparation calendar on June 17, 2026.
What is being elected in Russia in September 2026?
All 450 seats in the State Duma of the 9th convocation, the lower house of Russia's Federal Assembly; 226 seats are needed for a majority. United Russia entered the election with 310 of the outgoing seats after winning 324 seats and 49.82% of the vote in 2021.
Are there active Polymarket markets on the Russian Duma election?
Yes. At the August 21, 2026 snapshot, three Gamma events were active and not closed: the most-seats-gained board (about $21.34 million cumulative volume), the winner board (about $3.25 million), and the second-place board (about $348,800) — roughly $24.9 million combined, with about $4.35 million combined liquidity.
Who does Polymarket favor in the 2026 Russian election?
At the August 21, 2026 snapshot, United Russia traded near 98.6 cents in the winner board but only 70.5 cents in the most-seats-gained board, where New People traded at 21.85 cents. In the second-place board the Communist Party (KPRF) traded at 85.5 cents. These are timestamped market-implied prices, not forecasts or guarantees.
Why do United Russia's prices differ between the two Polymarket boards?
The boards ask different questions. The winner board resolves to the party that wins the greatest number of seats. The most-seats-gained board resolves to the party that gains the greatest number of seats compared to before the election, a different measurement when the ruling party already holds 310 seats.
How do the Russian election markets resolve if results are unknown or disputed?
All three reviewed boards resolve on a consensus of credible reporting, falling back to official Russian government sources such as the Central Election Commission if reporting is ambiguous. If results are not known definitively by September 30, 2027, 11:59 PM ET, each market resolves to Other. Seat ties break first by valid votes, then by alphabetical party abbreviation.
When will this Russia Duma election 2026 guide be refreshed?
A pre-vote review is planned for about September 10, 2026, roughly a week before voting opens, with a post-election settlement record afterward. The page is also updated earlier if the official calendar changes, a market closes or its rules change, party labels change, or prices reprice materially.
Sources and methodology
- Wikipedia: 2026 Russian legislative election — voting dates September 18–20, 2026; June 16, 2026 presidential decree; June 17, 2026 CEC calendar; 450 seats and 226-majority threshold; 2021 results (United Russia 324 seats, 49.82%); outgoing seat distribution; party leaders; CEC budget per Interfax; political-context background. Checked August 21, 2026.
- Polymarket Gamma: most-seats-gained event (id 149589) — active/open status, per-contract YES prices and volumes, event totals, and full resolution wording including the September 30, 2027 Other deadline and tie-breaks. Snapshot about 14:00 UTC, August 21, 2026.
- Polymarket Gamma: winner event (id 149565) — status, prices, volumes, and resolution wording including the coalition-accounting note. Same snapshot window.
- Polymarket Gamma: second-place event (id 403883) — status, prices, volumes, and the ranking-based resolution definition. Same snapshot window.
- Public Polymarket event pages — live market surfaces for current order books and contract text. Prices reproduced above only as a timestamped snapshot with staleness caveats.
The August 21, 2026 publication review covered the complete blog index, all article HTML files, all 21 existing event hubs, the 132-URL sitemap, proactive state (no due refreshes today), current-day publisher output, and the latest local GSC snapshot. No existing page targets Russian-election intent, so a new canonical URL was created for this event; the U.S. midterms, Brazil, and political-markets guide pages link here editorially. The page is educational and does not claim any election outcome, trading result, or return.