By James Kratch | NJ Advance Media for NJ.com

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John Munson | NJ Advance Media for NJ.com

The Big Ten will have one new head coach for the 2018 season.

But how many coaching changes will happen between this coming fall and the start of the 2019 season?

There could be none ... or there may be several. It all depends on how things play out this year. While coaches like Urban Meyer are going nowhere, days might be numbered for, say, Lovie Smith. Or Jim Harbaugh? We shall see.

Here's a coach-by-coach job security for the entire Big Ten (coaches are listed in school alphabetical order):

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Michael Hickey | Getty Images

LOVIE SMITH, ILLINOIS

Tenure at Illinois: Third season.

Record at Illinois: 5-19.

Career coaching record: 94-106 (NFL included).

Seat temperature: Very hot.

The skinny: If you can find a sports book willing to take a futures bet on Bret Bielema being the Illinois coach in 2019, jump at the opportunity. The Illini look like the Big Ten's worst team again this fall and Smith hasn't had much success in recruiting so far. This seems like a marriage that isn't going anywhere, but it might last a little bit longer because Smith still has years and millions left on his deal. Still, Illinois would be smart to eat the buyout if 2018 is another dud of a season.

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Marc Lebryk | USA TODAY Sports

TOM ALLEN, INDIANA

Tenure at Indiana: Second season.

Record at Indiana: 5-8.

Career coaching record: 5-8.

Seat temperature: Thermostat in hand.

The skinny: Allen had a solid first season at Indiana, going 5-7. If the Hoosiers can get back to a bowl game and/or play respectable defense, there's a good chance Allen gets a third year. But he's the lowest-paid coach in the conference and it wouldn't be hard to cut ties if Indiana finishes under .500 again. It depends on what IU feels at the end of the season.

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Seth Wenig | AP Photo

KIRK FERENTZ, IOWA

Tenure at Iowa: 20th season.

Record at Iowa: 143-97.

Career coaching record: 155-118.

Seat temperature: Room temperature.

The skinny: Ferentz is under contract through 2026. He's never going to get fired by the Hawkeyes, but he could work himself into a spot where he's politely ushered aside at some point. Don't count on it though. Iowa's returning talent and favorable schedule should have it competing for a Big Ten West title in 2018.

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Jesse Johnson | USA TODAY Sports

D.J. DURKIN, MARYLAND

Tenure at Maryland: Third season.

Record at Maryland: 10-15.

Career coaching record: 11-15.

Seat temperature: Medical ice pack.

The skinny: Durkin made a bowl game in his first year. He took a step back to 4-8 last fall when he lost all his quarterbacks to injury. Year 3 will be an interesting fork-in-the-road.

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Kim Klement | USA TODAY Sports

JIM HARBAUGH, MICHIGAN

Tenure at Michigan: Fourth season.

Record at Michigan: 28-11.

Career coaching record: 135-60-1 (NFL included).

Seat temperature: Lukewarm, but getting itchy.

The skinny: This is a critical year for Harbaugh. He can run his mouth and pull zany stunts all he wants, but the bottom line is he hasn't won a big game since the 2012 NFC Championship Game. With a loaded defense and Shea Patterson at quarterback, Harbaugh will be expected to contend for the Big Ten East crown, which means beating Michigan State, Ohio State and Penn State. It's unlikely Harbaugh would be in danger of getting fired if the Wolverines have another lackluster season, but the odds he'll run back to the NFL will certainly increase.

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I guess you can always point out that Jim Harbaugh is a combined 3-9 in Ohio State-Michigan + Michigan-Michigan State games, BCS/CFP bowls, NFC title games and Super Bowls. — James Kratch (@JamesKratch) January 29, 2018

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Jake Roth | USA TODAY Sports

MARK DANTONIO, MICHIGAN STATE

Tenure at Michigan State: 12th season.

Record at Michigan State: 100-45.

Career coaching record: 118-62.

Seat temperature: Cool, but it could heat up fast.

The skinny: Dantonio appears to have weathered this spring's firestorm caused by sexual assault allegations against Michigan State football players and criticism of the way Dantonio handled the matters. The Spartans are coming off a bounce-back season and should contend for a Big Ten title this fall. But if the ugly headlines pop back up, his tenure will again be threatened.

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Jesse Johnson | USA TODAY Sports

P.J. FLECK, MINNESOTA

Tenure at Minnesota: Second season.

Record at Minnesota: 5-7.

Career coaching record: 35-29.

Seat temperature: An enthusiastic, epic cool.

The skinny: If the exuberant Fleck can lift the Golden Gophers to a Big Ten West title or a major bowl game, he will likely be able to bolt for a bigger job. But a sparkling new facility could be a sign he can build something long-term at Minnesota.

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Patrick Gorski | USA TODAY Sports

PAT FITZGERALD, NORTHWESTERN

Tenure at Northwestern: 13th season.

Record at Northwestern: 87-65.

Career coaching record: 87-65.

Seat temperature: Lake-effect snow.

The skinny: Fitzgerald is a legend at his alma mater, the Wildcats have won 10 games twice in the last three seasons, they just opened their gorgeous practice facility on the banks of Lake Michigan and the Chicago Bears – the only other job most think Fitzgerald would ever consider – just hired a new coach in January. Fitz isn't going anywhere.

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Streeter Lecka | Getty Images

SCOTT FROST, NEBRASKA

Tenure at Nebraska: First season.

Record at Nebraska: 0-0.

Career coaching record: 19-7.

Seat temperature: A refreshing breeze on your honeymoon.

The skinny: Frostmania is running wild in Nebraska, which was to be expected with the former Cornhusker great coming home. Frost has united Big Red Nation and has drawn rave reviews as he seeks to restore Nebraska to its past culture and glory. But once the nostalgia rush subsides, can Frost (or anyone) build a national championship-caliber program in Lincoln? Or are those days over? It feels like we're about to get a final ruling on whether Nebraska is a faded superpower, or a dormant giant about to be awoken.

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Michael Conroy | AP Photo

URBAN MEYER, OHIO STATE

Tenure at Ohio State: Seventh season.

Record at Ohio State: 73-8.

Career coaching record: 177-31.

Seat temperature: Cryotherapy chamber cold.

The skinny: This one really doesn't need much explanation.

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Joe Hermitt | jhermitt@pennlive.com

JAMES FRANKLIN, PENN STATE

Tenure at Penn State: Fifth season.

Record at Penn State: 36-17.

Career coaching record: 60-32.

Seat temperature: Iced over like a Georgia State kicker.

The skinny: Franklin is in a weird spot. It would be very hard for him to get a better college job than the one he currently has – maybe USC? – and the view here is he is not a good enough Xs-and-Os guy to make the jump to the NFL. So he's probably going to be in State College for the foreseeable future.

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Dennis Schneidler | USA TODAY Sports

JEFF BROHM, PURDUE

Tenure at Purdue: Second season.

Record at Purdue: 7-6.

Career coaching record: 37-16.

Seat temperature: Cold, but how long will he stay seated?

The skinny: If Brohm has another strong season at Purdue, look for him to land a bigger job in 2019 or 2020. He might have his eyes on his alma mater, Louisville.

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John Munson | NJ Advance Media for NJ.com

CHRIS ASH, RUTGERS

Tenure at Rutgers: Third season.

Record at Rutgers: 6-18.

Career coaching record: 6-18.

Seat temperature: Much, much colder than some fans act.

The skinny: One of the things that has surprised me since I hopped on the Rutgers beat: The corners of the fan base who act like Ash's seat should be hot. He just won three Big Ten games last year with a team that wasn't expected to win any, and he's cleaned up what was a dumpster fire of a program. Now he's heading into Year No. 3 with a recent extension, a potentially game-changing recruit (quarterback Artur Sitkowski) and a chance to get to a bowl game.

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Mike Ehrmann | Getty Images

PAUL CHRYST, WISCONSIN

Tenure at Wisconsin: Fourth season.

Record at Wisconsin: 33-8.

Career coaching record: 52-27.

Seat temperature: Frozen tundra.

The skinny: Chryst has built on what Barry Alvarez and Bielema started and has kept the Badgers among the Big Ten elite. Now the big question: Can he turn the program into a regular CFP contender? The non-conference schedule has to get better, and it is with a stadium series with Notre Dame on the horizon.

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John Munson | NJ Advance Media for NJ.com

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James Kratch may be reached at jkratch@njadvancemedia.com. Follow him on Twitter @JamesKratch. Find NJ.com Rutgers Football on Facebook.