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2026 Idaho Senate Race odds

Polymarket traders make Jim Risch (R) the favorite for “Idaho Senate Election Winner” at 97% (+0.4 pts in the last 24 hours), ahead of Todd Achilles (I) at 3%.

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Prices refresh every few minutes. Probabilities are not predictions or advice, and you can lose what you trade.

Probability over the last 30 days

The top 3 outcomes right now.

Oct 2Nov 1
Jim Risch (R)Todd Achilles (I)Democrat

All 3 outcomes and their odds

Probability is the share price. Decimal odds show what $1 returns if that outcome wins, before fees. American odds show the same price as a moneyline: +150 pays $150 on a $100 stake, −200 needs $200 to win $100.

Odds as of

Where this market stands

“Idaho Senate Election Winner” is a Polymarket event with 3 open outcomes. Jim Risch (R) leads at 97%, ahead of Todd Achilles (I) at 3%. Jim Risch (R) is up 0.4 points over the last 24 hours and up 1.1 points over the past week. Traders have put $478K through the event so far, including $7,071 in the last 24 hours, and it is scheduled to end on November 4, 2026.

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How this market resolves

This market will resolve according to the winner of the 2026 midterm Idaho U.S. Senate election, inclusive of any run-offs.

A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.

Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.

The candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of the party.

The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.

Rules are written by Polymarket and shown as published. WhaleSays does not settle markets.

Common questions

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Who is the favorite in Idaho Senate Election Winner?
Jim Risch (R) is the favorite at 97%, followed by Todd Achilles (I) at 3% and Democrat at <0.1%. Prices are the market's implied probabilities and update as traders buy and sell.
Will the Republicans win the Idaho Senate race in 2026?
Polymarket traders give Jim Risch (R) a 97% chance, which is decimal odds of 1.04 (American −2841): $1 staked on Jim Risch (R) returns about $1.04 if it resolves Yes, before fees. In the last 24 hours the price moved up 0.4 points.

Related odds

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