NewThe Ultimate Universe 1: Beginnings

Prequels:

Ultimate Iron Man, vol.1

Reprints Ultimate Iron Man #1-5 (March 2005 – February 2006).
Later stories in the Ultimate Universe have cast doubt on the canonicity of this mini-series, and it may be out of continuity.

Ultimate Iron Man, vol.2

Reprints Ultimate Iron Man II #1-5 (December 2007 – July 2008).
Later stories in the Ultimate Universe have cast doubt on the canonicity of this mini-series, and it may be out of continuity.

Ultimate Daredevil & Elektra

Reprints Ultimate Daredevil and Elektra #1-4 (October 2002 – February 2003).

Ultimate Elektra: Devil’s Due

Reprints Ultimate Elektra #1-5 (August 2004 – December 2004).

The Beginning:

Ultimate Spider-Man, vol.1: Power and Responsibility

Reprints Ultimate Spider-Man #1-7 (October 2000 – May 2001).

Ultimate Spider-Man, vol.2: Learning Curve

Reprints Ultimate Spider-Man #8-13 (June 2001 – November 2001).

Ultimate X-Men, vol.1: The Tomorrow People

Reprints Ultimate X-Men #1-6 (February 2001 – July 2001).

Ultimate Spider-Man, vol.3: Double Trouble

Reprints Ultimate Spider-Man #14-21 (December 2001 – June 2002).

Ultimate Spider-Man, vol.4: Legacy

Reprints Ultimate Spider-Man #22-27 (July 2002 – November 2002).

Ultimate Marvel Team-up

Reprints Ultimate Marvel Team Up #1-15 (May 2001 – July 2002) & Ultimate Spider-Man Super Special #1 (July 2002).
Ultimate Marvel Team Up is difficult to place – it must occur before The Ultimates 1 for events in the Hulk story, but the same story must occur after USM 4. Compounding this, the Wolverine story appears to occur before UXM 1. However, it can be placed here without doing too much violence to that story. In addition, the appearances of the Fantastic Four in this volume are not considered canonical.

Ultimate X-Men, vol.2: Return to Weapon X

Reprints Ultimate X-Men #7-12 (August 2001 – January 2002).
The appearance of Sabertooth here implies a placement after that of UTU1; also this story occurs prior to the formation of the Ultimates.

Ultimate X-Men, vol.3: World Tour

Reprints Ultimate X-Men #13-20 (February 2002 – August 2002).

The Ultimates, vol.1: Super-Human

Reprints The Ultimates #1-6 (March 2002 – August 2002).

Ultimate Comics Thor

Reprints Ultimate Comics Thor #1-4 (October 2010 – February 2011).
This volume is primarily prequel, but carries right up to the first volume of Ultimates, hence its placement here.

Ultimate Adventures: One Tin Soldier

Reprints Ultimate Adventures #1-6 (November 2002 – September 2003).
Takes place during and after Ultimates.

Ultimate Spider-Man, vol.5: Public Scrutiny

Reprints Ultimate Spider-Man #28-32 (December 2002 – February 2003).
Must occur after Ultimates for the appearance of the Wasp.

Ultimate X-Men, vol.4: Hellfire & Brimstone

Reprints Ultimate X-Men #21-25 (September 2002 – January 2003).

The Ultimates, vol.2: Homeland Security

Reprints The Ultimates #7-13 (September 2002 – April 2004).

The Ultimates: Against All Enemies

Original prose novel by Alex Irvine.

Ultimate Spider-Man, vol.6: Venom

Reprints Ultimate Spider-Man #33-39 (February 2003 – June 2003).

The Ultimates: Tomorrow Men

Original prose novel by Michael Jan Friedman.

Ultimate X-Men, vol.5: Ultimate War

Reprints Ultimate War #1-4 (February 2003 – April 2003).
Must occur after the end of Ultimates 2.

Ultimate X-Men, vol.6: Return of The King

Reprints Ultimate X-Men #26-33 (February 2003 – July 2003).

Ultimate Spider-Man, vol.7: Irresponsible

Reprints Ultimate Spider-Man #40-45 (July 2003 – November 2003).

Ultimate X-Men, vol.7: Blockbuster

Reprints Ultimate X-Men #34-39 (August 2003 – November 2003).

Ultimate Spider-Man, vol.8: Cats & Kings

Reprints Ultimate Spider-Man #47-53 (December 2003 – April 2004).

Ultimate X-Men, vol.8: New Mutants

Reprints Ultimate X-Men #40-45 (February 2004 – July 2004).

Ultimate Spider-Man, vol.9: Ultimate Six

Reprints Ultimate Spider-Man #46 (November 2003) and Ultimate Six #1-7 (November 2003 – June 2004).

Ultimate Galactus, vol.1: Nightmare

Reprints Ultimate Nightmare #1-5 (October 2004 — February 2005).

Ultimate Fantastic Four, vol.1: The Fantastic

Reprints Ultimate Fantastic Four #1-6 (February 2004 – July 2004).

Ultimate Spider-Man, vol.10: Hollywood

Reprints Ultimate Spider-Man #54-59 (May 2004 – July 2004).

Ultimate X-Men, vol.9: The Tempest

Reprints Ultimate X-Men #46-49 (July 2004 – September 2004).

Ultimate Fantastic Four, vol.2: Doom

Reprints Ultimate Fantastic Four #7-12 (August 2004 – December 2004).

Ultimate Spider-Man, vol.11: Carnage

Reprints Ultimate Spider-Man #60-65 (August 2004 – November 2004).

Ultimate X-Men, vol.10: Cry Wolf

Reprints Ultimate X-Men #50-53 (October 2004 – January 2005).

Ultimate Fantastic Four, vol.3: N-Zone

Reprints Ultimate Fantastic Four #13-18 (January 2005 – June 2005).

Ultimate Spider-Man, vol.12: Superstars

Reprints Ultimate Spider-Man #66-71 (December 2004 – March 2005).

Ultimate X-Men, vol.11: The Most Dangerous Game

Reprints Ultimate X-Men #54-57 (February 2005 – May 2005).

Ultimate Galactus, vol.2: Secret

Reprints Ultimate Secret #1-5 (May 2005 — December 2005).

Ultimate Spider-Man, vol.13: Hobgoblin

Reprints Ultimate Spider-Man #72-78 (April 2005 – July 2005).

Ultimate X-Men, vol.12: Hard Lessons

Reprints Ultimate X-Men #58-60 (June 2005 – August 2005) & Ultimate X-Men Annual #1 (2005).

Ultimate Fantastic Four, vol.4: Inhuman

Reprints Ultimate Fantastic Four #19-20 (July 2005 – August 2005) & Ultimate Fantastic Four Annual #1 (2005).

Ultimate Annuals, vol.1

Reprints Ultimates Annual #1 (2005); Ultimate Fantastic Four Annual #1 (2005); Ultimate X-Men Annual #1 (2005); & Ultimate Spider-Man Annual #1 (2005).
All but the Ultimates story are also reprinted in volumes of their respective series.

Ultimate Spider-Man, vol.14: Warriors

Reprints Ultimate Spider-Man #79-85 (August 2005 – January 2006).

Ultimate Fantastic Four, vol.5: Crossover

Reprints Ultimate Fantastic Four #21-26 (September 2005 – February 2006).
This story crosses into the Zombieverse.

Ultimate X4

Reprints Ultimate X4 #1-2 (December 2005 – January 2006).

Ultimate Spider-Man, vol.15: Silver Sable

Reprints Ultimate Spider-Man #86-90 (January 2006 – April 2006) and Ultimate Spider-Man Annual #1 (2005).

Ultimate Galactus, vol.3: Extinction

Reprints Ultimate Extinction #1-5 (March 2006 — July 2006).

Ultimate Vision

Reprints Ultimate Vision #0-5 (January 2007 – January 2008).
Contains two stories, one occurring before Ultimate Galactus 3, one after, but is best read here.