Market icon
Elections·Derivatives

Republican 2026 Senate odds hit___ by March 31?

Market icon
Elections·Derivatives

Republican 2026 Senate odds hit___ by March 31?

Mar 31

Nov 3

Mar 31

Nov 3

$166,732 Vol.

Mar 31, 2026
Polymarket

$166,732 Vol.

Polymarket

↑ 90%

$0 Vol.

1%

↑ 80%

$0 Vol.

1%

↑ 75%

$91,240 Vol.

1%

↑ 70%

$0 Vol.

2%

↓ 40%

$52,756 Vol.

8%

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-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.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-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.
Volume
$166,732
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 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.

Outcome proposed: Yes

No dispute

Final outcome: Yes

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-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.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.

Trader consensus prices Republican control of the U.S. Senate after 2026 elections at around 68%, driven by a map where the GOP defends 22 seats versus Democrats' 11, many in Trump-won states. Recent catalysts include robust Republican gains in 2024 House races signaling momentum, early polls favoring incumbents like Susan Collins in Maine and Thom Tillis in North Carolina, and limited Democratic recruitment amid vulnerabilities in Ohio and Michigan. Midterm dynamics historically challenge the president's party, tempering optimism. Traders eye March announcements on retirements and 2025 special elections as potential movers before the deadline.

Experimental AI-generated summary referencing Polymarket data · Updated

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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 $166.7K 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.