Election Day: An hour-by-hour viewer’s guide

For a solid hour on Tuesday, all eyes will be trained on Lexington, Ky., and its suburbs, where Rep. Andy BarrAndy Hale BarrFarm manager doubts story horse bit Pence: report McConnell accepts Democratic rep's challenge to 5 debates McConnell campaign criticized for tombstone with challenger's name MORE (R) is running for reelection against retired Marine Lt. Col. Amy McGrath (D).

That’s because Kentucky closes its polling places at 6 p.m. local time — and Barr’s 6th District is the only competitive race based entirely within the Eastern time zone.

Here’s an hour-by-hour look at how Election Day will unfold, and what to watch as the polls close.

6 p.m. Eastern — The Canary in Coal Country

Barr represents a district that voted for President TrumpDonald John TrumpJulián Castro: It's time for House Democrats to 'do something' about Trump Warren: Congress is 'complicit' with Trump 'by failing to act' Sanders to join teachers, auto workers striking in Midwest MORE by a 15-point margin in 2016 — but it’s a seat with Democratic roots, one long held by former Rep. Ben Chandler (D). If McGrath pulls off an early upset, Republicans are likely going to have a very bad night. But if Barr hangs on, as polling indicates, the GOP’s House majority is still in play.

7 p.m. — The First Hints

Six states close their polling places at 7 p.m., from liberal Vermont to conservative South Carolina, and the rest of Kentucky.

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Vote-counting will begin in two of the hottest races in the country: Georgia’s gubernatorial race, a fierce battle between Secretary of State Brian Kemp (R) and state House Minority Leader Stacey Abrams (D), and Indiana’s Senate race, where Sen. Joe DonnellyJoseph (Joe) Simon DonnellyLobbying world Trump nominees meet fiercest opposition from Warren, Sanders, Gillibrand GOP frets over nightmare scenario for Senate primaries MORE (D) faces former state Rep. Mike Braun (R).

If Donnelly loses quickly, it would augur poorly for other red-state Democratic senators. But if he prevails, Sens. Claire McCaskillClaire Conner McCaskillEx-CIA chief worries campaigns falling short on cybersecurity Ocasio-Cortez blasts NYT editor for suggesting Tlaib, Omar aren't representative of Midwest Trump nominees meet fiercest opposition from Warren, Sanders, Gillibrand MORE (D-Mo.) and Heidi HeitkampMary (Heidi) Kathryn HeitkampThe Hill's Morning Report — Biden steadies in third debate as top tier remains the same Trump wins 60 percent approval in rural areas of key states Pence to push new NAFTA deal in visit to Iowa MORE (D-N.D.) may find reason for optimism.

In Virginia, voters in the Richmond suburbs and Norfolk will reveal some of the first hints of the size of the Democratic advantage in the House. GOP Reps. Scott TaylorScott William TaylorFormer GOP rep launches Senate campaign in Virginia Virginia special prosecutor indicts former GOP campaign staffer The 31 Trump districts that will determine the next House majority MORE and Dave Brat have tough fights on their hands, and a Democrat is even making a run at outgoing Rep. Tom GarrettThomas (Tom) Alexander GarrettFemale Dems see double standard in Klobuchar accusations Ethics investigation finds outgoing House Republican made staff unload groceries, dog-sit Trump signs bill naming post office after soldier whose parents he attacked MORE’s (R) seat. If Democrats take two of those, the Republican majority is probably gone.

7:30 p.m. — A Blue Moon and a Blue Dog

Polls close in North Carolina, Ohio and West Virginia at this time. Two red-state Senate Democrats will see their fates decided: Sen. Sherrod BrownSherrod Campbell BrownBipartisan housing finance reform on the road less taken Hillicon Valley: Google to promote original reporting | Senators demand answers from Amazon on worker treatment | Lawmakers weigh response to ransomware attacks Senate Democrats want answers on 'dangerous' Amazon delivery system MORE (Ohio) is likely to cruise to reelection, and Sen. Joe ManchinJoseph (Joe) ManchinClarence Thomas, Joe Manchin, Rudy Giuliani among guests at second state visit under Trump Schumer: I don't know any 'Democrat who agrees' with O'Rourke on gun seizures O'Rourke: Many Democrats 'complicit' in gun problem MORE (W.Va.) is favored to win, but in a much tighter race.

Democrats will get the first signs of their ability to flip Republican-held governorships across the Midwest when Ohio begins counting its ballots. Former state Attorney General Richard CordrayRichard Adams CordrayTrump administration asks Supreme Court to take up challenge to consumer bureau Watchdog agency must pick a side: Consumers or scammers Kraninger's CFPB gives consumers the tools to help themselves MORE (D), who was later head of the Consumer Financial Protection Bureau in Washington, is fighting his successor, Mike DeWine (R), for the right to succeed term-limited Gov. John Kasich (R).

North Carolina experiences what they call a "blue moon" election, a rare year in which neither the governor nor a senator is on the ballot. That probably means lower turnout, but Democrats are running surprisingly strong races against Reps. George HoldingGeorge Edward Bell HoldingTrump administration says joint UNC, Duke program portrays Islam too positively Delay of new trade deal harms America's digital advantage Republicans troll Democrats with proposals to rename upcoming health care bill MORE (R) and Ted BuddTheodore (Ted) Paul BuddGirls Little League softball champions get invitation to White House House conservatives call for ethics probe into Joaquin Castro tweet Conservatives call on Pelosi to cancel August recess MORE (R), and for a seat held by Rep. Robert PittengerRobert Miller PittengerBottom Line North Carolina reporter says there could be 'new crop' of GOP candidates in 9th Congressional District race North Carolina board calls for new election in contested House race MORE (R), who lost his primary.

8 p.m. — The Big Enchilada

Sixteen states and the District of Columbia are done voting by 8 p.m. Eastern, including a handful of states that will give a fuller picture of the electorate’s mood.

Governor’s races will be decided in Alabama, Connecticut, Florida, Illinois, Maine, Maryland, Massachusetts, New Hampshire, Oklahoma, Pennsylvania, Rhode Island and Tennessee.

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The biggest prize for Democrats would be in Florida, scene of a nasty battle between Tallahassee Mayor Andrew Gillum (D) and former Rep. Ron DeSantisRonald Dion DeSantisClarence Thomas, Joe Manchin, Rudy Giuliani among guests at second state visit under Trump Trump parts ways with key Florida adviser: report Death and destruction: A timeline of Hurricane Dorian MORE (R). In Connecticut, businessman Bob Stefanowski (R) is running a particularly tough race against progressive hero Ned Lamont (D). Expect Govs. Charlie Baker (R) of Massachusetts and Larry Hogan (R) of Maryland to win reelection easily, thanks to ticket-splitters who will also reelect Sens. Elizabeth WarrenElizabeth Ann WarrenWarren: Congress is 'complicit' with Trump 'by failing to act' Sanders to join teachers, auto workers striking in Midwest Pelosi wants to change law to allow a sitting president to be indicted MORE (D-Mass.) and Ben CardinBenjamin (Ben) Louis CardinSenate confirms two Treasury nominees over Democratic objections Congress passes bill to begin scenic byways renaissance GOP lawmaker: 'Dangerous' abuse of Interpol by Russia, China, Venezuela MORE (D-Md.).

Vote-counting also begins in key Senate races in Florida, Missouri, New Jersey, Pennsylvania and Tennessee. In Mississippi, expect Sen. Cindy Hyde-Smith (R) and former Agriculture Secretary Mike Espy (D) to head to a late November runoff.

The House battleground expands to Democratic targets in Florida, Illinois, Maine, New Hampshire, New Jersey, Oklahoma — where a PAC linked to former New York City Mayor Michael Bloomberg is making a late play against Rep. Steve RussellSteven (Steve) Dane RussellThe 31 Trump districts that will determine the next House majority 5 themes to watch for in 2020 fight for House Oklahoma New Members 2019 MORE (R) — and Pennsylvania. Democrats are going to pick up a handful of seats in Pennsylvania, where the state Supreme Court ordered district maps redrawn earlier this year.

Voters in the District of Columbia are likely to reelect Mayor Muriel Bowser (D).

Delaware and Rhode Island start their vote counts at 8 p.m., too.

8:30 p.m. — The (French) Hill to Die On

Arkansas voters are likely to reelect Gov. Asa Hutchinson (R). The only truly competitive race here is in the state’s 2nd District, where Rep. French HillJames (French) French HillA true believer in diversity, inclusion Restore Pell Grant eligibility to people in prison Here are the lawmakers who will forfeit their salaries during the shutdown MORE (R) faces a tough challenge from state Rep. Clarke Tucker (D). Hill is likely to win reelection, but the district has Democratic roots: Hill’s predecessor took over for Rep. Vic Snyder, a Democrat who held the Little Rock-based seat for 14 years.

9 p.m. — Go West, Young Man

The first Mountain West states start to close at this time, along with most of the Midwest.

Voters in Arizona, Michigan, Minnesota, North Dakota, Texas and Wisconsin are electing senators. Democrats are hopeful that Rep. Kyrsten Sinema (D) can defeat a charging Rep. Martha McSallyMartha Elizabeth McSallyArizona Democrats push Sinema censure vote off until January Pence taps former DHS spokeswoman as his new press secretary Arizona Democratic Party will hold vote to censure Sinema MORE (R) in Arizona, while Republicans believe Rep. Kevin CramerKevin John CramerPrimary challenges show potential cracks in Trump's GOP Castro, Steyer join pledge opposing the Keystone XL pipeline EPA proposes rolling back states' authority over pipeline projects MORE (R) will oust Heitkamp in North Dakota. And Sen. Ted CruzRafael (Ted) Edward CruzState Department's top arms control official leaving Sanders NASA plan is definitely Earth first Trump judicial picks face rare GOP opposition MORE (R) has a leg up on Rep. Beto O’Rourke (D), despite the Democrat’s absolutely mammoth fundraising performance.

New governors will be elected in Colorado, Kansas, Michigan, Minnesota, New Mexico, South Dakota and Wyoming, all states where the incumbents are termed out. Wisconsin Gov. Scott Walker (R) is in the fight of his life, while Govs. Andrew Cuomo (D) of New York, Doug Ducey (R) of Arizona and Greg Abbott (R) of Texas are skating toward another term.

Democrats and Republicans are battling over House districts in Arizona, Kansas, Michigan, Minnesota, Nebraska, New Mexico, New York, Texas and Wisconsin.

Voters in Louisiana don’t have many competitive races to decide, but they shouldn’t feel left out: The race for governor in 2019 kicks off just as soon as the polls close on Tuesday.

10 p.m. — Defining the Wave

If a Democratic blue wave is forming, we’ll get a sense of how high it is when polls close in Iowa, Montana, Nevada and Utah.

Reps. Rod Blum (R) and David YoungDavid Edmund YoungFormer 'Apprentice' contestant ranks Trump next to Mother Teresa on women's issues Churches are arming and training congregants in response to mass shootings: report Assault weapons ban picks up steam in Congress MORE (R) face stiff challenges in Iowa, and both could lose without a tremendous wave breaking. But what about GOP Rep. Steve KingSteven (Steve) Arnold KingIowa Steak Fry to draw record crowds for Democrats Ocasio-Cortez rips Steve King after he shares video drinking from toilet-fountain hybrid at border Steve King says he drank from toilet at detention center MORE? While his district is much more conservative, King has become a lightning rod for associating himself with white supremacists across the country and around the world.

If Democrats are having a rough night in Senate races, this is the hour that will demonstrate just how bad it’s going: Their top target is Sen. Dean HellerDean Arthur HellerThis week: Barr back in hot seat over Mueller report Trump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Trump picks ex-oil lobbyist David Bernhardt for Interior secretary MORE (R-Nev.), who’s running even with Rep. Jacky RosenJacklyn (Jacky) Sheryl RosenHillicon Valley: Trump seeks review of Pentagon cloud-computing contract | FTC weighs updating kids' internet privacy rules | Schumer calls for FaceApp probe | Report says states need more money to secure elections Senators introduce legislation to boost cyber defense training in high school Key endorsements: A who's who in early states MORE (D) in most polls. Democrats are defending Sen. Jon TesterJonathan (Jon) TesterDemocratic senators quietly hope Biden wins over rivals GOP Sen. Johnny Isakson to resign at end of year Native American advocates question 2020 Democrats' commitment MORE (Mont.), who is in a surprisingly close and late-breaking race against state Auditor Matt Rosendale (R).

In Utah, Rep. Mia LoveLudmya (Mia) LoveFormer GOP lawmaker: Trump's tweets have to stop Congressional Women's Softball team releases roster The 31 Trump districts that will determine the next House majority MORE (R) finds herself in an unexpectedly tough battle; one poll shows her losing to Salt Lake County Mayor Ben McAdams (D).

11 p.m. — The Best Coast

Polls close in four of the five states that touch the Pacific Ocean, along with Idaho.

Voters in California and Idaho are electing new governors. California voters, especially those in the Central Valley and Orange County, will decide the fates of a handful of endangered House Republicans.

In Washington, voters will decide a hard-fought contest for a congressional seat being vacated by Rep. Dave ReichertDavid (Dave) George ReichertLymphedema Treatment Act would provide a commonsense solution to a fixable problem Yoder, Messer land on K Street Ex-GOP lawmaker from Washington joins lobbying firm MORE (R). If voters are really in the mood for change, Reps. Cathy McMorris RodgersCathy McMorris RodgersSocial determinants of health — health care isn't just bugs and bacteria Lawmakers deride FTC settlement as weak on Facebook Overnight Energy: Fight over fuel standards intensifies | Democrats grill Trump officials over rule rollback | California official blasts EPA chief over broken talks | Former EPA official says Wheeler lied to Congress MORE (R) and Jaime Herrera BeutlerJaime Lynn Herrera BeutlerDems push to revive Congress' tech office Bill allowing Congress to hire Dreamers advances House fails to override Trump veto on border wall MORE (R) could also have uncomfortable nights — remember, no state kicked out more Democratic incumbents in the 1994 GOP wave than Washington.

Republicans have one more shot for an upset, this time in Oregon, where Gov. Kate Brown (D) is in a more difficult than expected battle for reelection.

Hawaii voters are likely to reelect Gov. David Ige (D) and send former Rep. Ed Case (D) back to Congress.

1 a.m. — The Aleutian Solution

The vast majority of polling places in Alaska close at midnight Eastern time, but seven hours after the first polls close in Kentucky, voters in parts of the Aleutian Islands will cast the final ballots of the 2018 general election.

Alaska voters will elect a new governor, after Gov. Bill Walker (I) dropped his reelection bid late last month. And one recent poll showed the dean of the House, Rep. Don YoungDonald (Don) Edwin YoungHundreds turn out for London's first transgender equality march The Hill's Morning Report — The wall problem confronting Dems and the latest on Dorian House passes bill requiring CBP to enact safety, hygiene standards MORE (R), in trouble against education activist Alyse Galvin (D).