Market icon
Elections·Derivatives

Republican 2026 Senate odds hit___ by March 31?

Market icon
Elections·Derivatives

Republican 2026 Senate odds hit___ by March 31?

Ended: Mar 31

Ended: Mar 31

$527,830 Vol.

Mar 31, 2026
Polymarket

$527,830 Vol.

Polymarket

↑ 90%

$9,068 Vol.

No

↑ 80%

$73,574 Vol.

No

↑ 75%

$115,051 Vol.

No

↑ 70%

$25,751 Vol.

No

↓ 60%

$22,735 Vol.

Yes

↓ 55%

$0 Vol.

Yes

↓ 50%

$0 Vol.

Yes

↓ 40%

$281,650 Vol.

No

This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-90-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-80-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-75-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-70-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced under the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-under-60-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced under the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-under-55-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced under the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-under-50-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced under the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-under-40-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.Republican trader consensus for 2026 Senate control has shifted sharply in recent weeks, with Democrats now implied at 52% probability to flip the chamber on Polymarket after hovering near 50-50 through late March. This reflects escalating U.S.-Iran tensions following airstrikes, viewed as a growing liability for President Trump's administration amid the historical midterm curse where the president's party loses Senate seats in 18 of 20 cycles since 1946. Republicans defend 20 seats—including battlegrounds in Maine, North Carolina, and Texas—versus Democrats' 13, amplifying vulnerability. GOP Senate blockage of the Save America Act despite public support has eroded confidence. Primaries begin summer 2026, with general elections November 3; the March 31 deadline for this derivative market has passed without Republican odds hitting 70%+ or 40% thresholds.

This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”.

A tie in the number of minutes will not suffice.

The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-90-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data.

Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.
Volume
$527,830
End Date
Mar 31, 2026
Market Opened
Dec 5, 2025, 4:00 PM ET

Resolver

0x65070BE91...
This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-90-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.

Outcome proposed: No

No dispute

Final outcome: No

This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-90-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-80-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-75-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-70-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced under the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-under-60-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced under the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-under-55-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced under the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-under-50-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced under the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-under-40-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.Republican trader consensus for 2026 Senate control has shifted sharply in recent weeks, with Democrats now implied at 52% probability to flip the chamber on Polymarket after hovering near 50-50 through late March. This reflects escalating U.S.-Iran tensions following airstrikes, viewed as a growing liability for President Trump's administration amid the historical midterm curse where the president's party loses Senate seats in 18 of 20 cycles since 1946. Republicans defend 20 seats—including battlegrounds in Maine, North Carolina, and Texas—versus Democrats' 13, amplifying vulnerability. GOP Senate blockage of the Save America Act despite public support has eroded confidence. Primaries begin summer 2026, with general elections November 3; the March 31 deadline for this derivative market has passed without Republican odds hitting 70%+ or 40% thresholds.

This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”.

A tie in the number of minutes will not suffice.

The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-90-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data.

Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.
Volume
$527,830
End Date
Mar 31, 2026
Market Opened
Dec 5, 2025, 4:00 PM ET

Resolver

0x65070BE91...
This market will resolve to “Yes” if the “Yes” option for 'Republican Party' in the "Which party will win the Senate in 2026?" market (https://polymarket.com/event/which-party-will-win-the-senate-in-2026?) is priced over the listed value for any four-hour period ending by March 31, 2026, 11:59 PM ET or earlier. Otherwise, this market will resolve to “No”. A tie in the number of minutes will not suffice. The resolution source will be the underlying minute-level price data for 'Republican Party' in the "Which party will win the Senate in 2026?" market, which can be viewed using the bar chart on https://derivative.polymarket.com/index/2026-us-senate-election-republican-odds-over-90-by-march-31 or through the “Resolution” tab with the time set to show the four-hour window. Both interfaces display the same underlying data. Note: This market will resolve according to the price scoring methodology of derivative.polymarket.com.

Outcome proposed: No

No dispute

Final outcome: No

Related

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Will the Republican Party hold 47 or fewer Senate seats after the 2026 midterm elections?

27%
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Will Chuck Schumer be the next Senate Majority Leader?

34%
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2026 Balance of Power: D Senate, D House

51%

Beware of external links.

Frequently Asked Questions

"Republican 2026 Senate odds hit___ by March 31?" is a prediction market on Polymarket with 8 possible outcomes where traders buy and sell shares based on what they believe will happen. The current leading outcome is "↓ 60%" at 100%, followed by "↓ 55%" at 100%. Prices reflect real-time crowd-sourced probabilities. For example, a share priced at 100¢ implies that the market collectively assigns a 100% chance to that outcome. These odds shift continuously as traders react to new developments and information. Shares in the correct outcome are redeemable for $1 each upon market resolution.

As of today, "Republican 2026 Senate odds hit___ by March 31?" has generated $527.8K in total trading volume since the market launched on Dec 5, 2025. This level of trading activity reflects strong engagement from the Polymarket community and helps ensure that the current odds are informed by a deep pool of market participants. You can track live price movements and trade on any outcome directly on this page.

To trade on "Republican 2026 Senate odds hit___ by March 31?," browse the 8 available outcomes listed on this page. Each outcome displays a current price representing the market's implied probability. To take a position, select the outcome you believe is most likely, choose "Yes" to trade in favor of it or "No" to trade against it, enter your amount, and click "Trade." If your chosen outcome is correct when the market resolves, your "Yes" shares pay out $1 each. If it's incorrect, they pay out $0. You can also sell your shares at any time before resolution if you want to lock in a profit or cut a loss.

The current frontrunner for "Republican 2026 Senate odds hit___ by March 31?" is "↓ 60%" at 100%, meaning the market assigns a 100% chance to that outcome. The next closest outcome is "↓ 55%" at 100%. These odds update in real-time as traders buy and sell shares, so they reflect the latest collective view of what's most likely to happen. Check back frequently or bookmark this page to follow how the odds shift as new information emerges.

The resolution rules for "Republican 2026 Senate odds hit___ by March 31?" define exactly what needs to happen for each outcome to be declared a winner — including the official data sources used to determine the result. You can review the complete resolution criteria in the "Rules" section on this page above the comments. We recommend reading the rules carefully before trading, as they specify the precise conditions, edge cases, and sources that govern how this market is settled.