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Season guide

Chicago Fire: Season 4

23 episodes Premiered Oct 13, 2015 Updated Oct 2, 2026

Chicago Fire Season 4 continues the overarching saga across 23 episodes, offering an edge-of-your-seat view into the lives of everyday heroes committed to one of America's noblest professions. The series follows the lives of firefighters, rescue workers, and paramedics at Chicago Firehouse 51, showcasing professionals who save lives through their work. Executive produced by Emmy Award winner Dick Wolf and written by

Previously on Chicago Fire

Season 4 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ The series centers on the lives of firefighters, rescue workers, and paramedics at Chicago Firehouse 51.
  • ⚡ The professional personnel are dedicated to saving human lives through their work.
  • ⚡ The overarching narrative is executive produced by Dick Wolf.
  • ⚡ The writing team includes Michael Brandt and Derek Haas.
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Season overview

Chicago Fire Season 4 continues the overarching saga across 23 episodes, offering an edge-of-your-seat view into the lives of everyday heroes committed to one of America's noblest professions. The series follows the lives of firefighters, rescue workers, and paramedics at Chicago Firehouse 51, showcasing professionals who save lives through their work. Executive produced by Emmy Award winner Dick Wolf and written by Michael Brandt and Derek Haas, the season maintains the focus on the dedication and challenges faced by the personnel of the Chicago fire department.

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Season 4 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 4 Progress Shield

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Binge Efficiency Engine

Season 4: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

13%
87%
Mytharc (3): Crucial lore & season climaxes
Core (20): Character development & subplots
Side Quest (0): Standalone / filler
S4·E1 Mytharc

Let It Burn

Oct 13, 2015 · 43 min

Casey is placed in a dangerous situation while working undercover to bring down a trafficking ring being run out of Nesbitt's club. The squad's high turnover rate results in an unw

S4·E2 Core

A Taste of Panama City

Oct 20, 2015 · 43 min

Boden's job is on the line pending an internal investigation. Severide adjusts to Patterson, his new commanding officer. Dawson shakes things up at the work. Casey searches for imp

S4·E3 Core

I Walk Away

Oct 27, 2015 · 43 min

Evidence that seems to exonerate Boden may not be enough. Brett and Chili find themselves in a precarious situation. The team responds to a stuck elevator in a hotel. Jimmy Borrell

S4·E4 Core

Your Day Is Coming

Nov 3, 2015 · 43 min

The squad members come together to support one of their own. Herrmann tries to figure out how to reopen Molly's after it gets shut down. Severide digs deep into the arson investiga

S4·E5 Core

Regarding This Wedding

Nov 10, 2015 · 42 min

Boden offers to host a wedding at the firehouse after a fire destroys the original location, but it doesn't sit well with Chief Riddle, who also butts heads with Dawson over her ab

S4·E6 Core

2112

Nov 17, 2015 · 42 min

Boden's new neighbor asks him for a favor that could have serious repercussions. Severide is upset when he's treated like a candidate by Patterson. Cruz is visited by a gangbanger

S4·E7 Core

Sharp Elbows

Nov 24, 2015 · 43 min

Boden suspects his neighbor is setting him up; Severide, who's still on probation, receives a surprise visit from his father and also learns something about Patterson that could be

S4·E8 Core

When Tortoises Fly

Dec 1, 2015 · 41 min

Boden believes Maddox is behind Serena's accusations. Severide reaches out to Jamie, who's Maddox's lawyer, in an attempt to help. Patterson questions whether Boden can remain chie

S4·E9 Core

Short and Fat

Dec 8, 2015 · 42 min

Patterson fills in for Boden, who's trying to clear his name. Severide learns where Serena may be hiding. Herrmann and Otis give Freddie a job that keeps him close by. Jimmy and Ch

S4·E10 Core

The Beating Heart (I)

Jan 5, 2016 · 42 min

Herrmann fights for his life after being stabbed; Cruz hits the streets to find Freddie. Mouch proposes to Trudy. The crossover continues on Chicago Med S01E05 Malignant (II) and

S4·E11 Core

The Path of Destruction

Jan 19, 2016 · 43 min

A tornado threatens Chicago. Chili makes a major mistake, which causes Brett to report her to Boden. Otis asks Dawson to help him solve his women troubles. Severide assists a Depar

S4·E12 Core

Not Everyone Makes It

Jan 26, 2016 · 43 min

Freddie's father begs Herrmann to forgive his son's assault. Casey discovers that a makeshift shelter housing people displaced by the tornado may close. Casey attends a fund-raiser

S4·E13 Core

The Sky Is Falling

Feb 2, 2016 · 43 min

The team responds to a mass shooting; Casey investigates the missing money from the fund-raiser. Jimmy agrees to represent the firehouse in a boxing match against the Chicago PD's

S4·E14 Core

All Hard Parts

Feb 9, 2016 · 42 min

Severide confronts Chili about her erratic behavior. Members of the firehouse rally around Casey, who they think would make a great candidate for alderman. Jimmy squares off agains

S4·E15 Core

Bad for the Soul

Feb 16, 2016 · 43 min

The team responds to a suspicious call from a neighboring firehouse; and welcomes a new firefighter, though her addition has repercussions. Casey moves forward in his run for alder

S4·E16 Core

Two Ts

Feb 23, 2016 · 41 min

Casey reconsiders his run for alderman after he's targeted by a propaganda campaign. The squad responds when a man is trapped inside of a burning car. Trudy's nerdy brother plans M

S4·E17 Core

What Happened to Courtney

Mar 29, 2016 · 42 min

Severide and Cruz find a child's remains inside a chimney while investigating a possible carbon monoxide leak inside a home. In other events, Casey braces for the worst in his run

S4·E18 Core

On the Warpath

Apr 5, 2016 · 42 min

Sylvie witnesses a murder and is threatened by the shooter not to go to the police. Firehouse 51 jumps into action when a fire breaks out at a restaurant and traps several people i

S4·E19 Core

I Will Be Walking

Apr 19, 2016 · 43 min

Casey steps up to help a teenager being bullied by a gang; Severide bonds with a detective’s son after her life is threatened; and Kidd and Herrmann go head-to-head in a test of ba

S4·E20 Core

The Last One for Mom

Apr 26, 2016 · 43 min

Firehouse 51 unites to help a young boy in tragic circumstances. A high-powered political consultant helps Casey navigate a potential scandal. Cruz makes a mistake that nearly cost

S4·E21 Core

Kind of a Crazy Idea

May 3, 2016 · 42 min

Dawson saves a young boy from an apartment fire. Kidd's idea for Molly's doesn't go as hoped. Severide hits a wall while advocating for new fire masks. Cruz and Brett utilize a sec

S4·E22 Mytharc

Where the Collapse Started

May 10, 2016 · 41 min

The team responds to a building collapse that's trapped more than a dozen people. Dawson's quest to foster Louie is aided by a familiar face. Otis, who's on medical leave, meets hi

S4·E23 Mytharc

Superhero

May 17, 2016 · 43 min

Boden and Jimmy are at odds. Kidd deals with her unstable ex. Dawson continues her quest to foster Louie. Casey's new political consultant urges him to think big. The team responds

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