2151 (Columbia)

2151

• April 16: The Enterprise NX-01 begins its historic mission of exploration. ("Broken Bow" ENT 01-02)
• Season One of Enterprise (2151-2152)
  • April 16: "Broken Bow" (ENT 01-02)
  • May 6: "Fight or Flight" (ENT 03)
  • Unknown: "Strange New World" (ENT 04)
  • Unknown: "Unexpected" (ENT 05)
  • Unknown: "Terra Nova" (ENT 06)
  • June 16: "The Andorian Incident" (ENT 07)
  • Unknown: "Breaking the Ice" (ENT 08)
  • July 31: "Civilization" (ENT 09)
  • Unknown: "Fortunate Son" (ENT 10)
  • September 1: "Silent Enemy" (ENT 12)
  • September 9: "Cold Front" (ENT 11)
  • Unknown: "Dear Doctor" (ENT 13)
  • Unknown: "Shadows of P'Jem" (ENT 14)
  • Unknown: "Sleeping Dogs" (ENT 15)
  • November 9: "Shuttlepod One" (ENT 16)
  • Unknown: "Fusion" (ENT 17)
  • Unknown: "Rogue Planet" (ENT 18)
  • Unknown: "Acquisition" (ENT 19)
  • Unknown: "Oasis" (ENT 20)

2152

• Season One of Enterprise (2151-2152)
  • Unknown: "Detained" (ENT 21)
  • Unknown: "Vox Sola" (ENT 22)
  • February 9: "Fallen Hero" (ENT 23)
  • February 12: "Desert Crossing" (ENT 24)
  • February 18: "Two Days and Two Nights" (ENT 25)
  • Unknown: "Shockwave" (ENT 26)

• Season Two of Enterprise (2152-2153)
  • Unknown: "Shockwave, Part II" (ENT 27)
  • April 15: "Carbon Creek" (ENT 28)
  • Unknown: "Minefield" (ENT 29)
  • Unknown: "Dead Stop" (ENT 31)
  • Unknown: "A Night in Sickbay" (ENT 30)
  • Unknown: "Marauders" (ENT 32)
  • Unknown: "The Seventh" (ENT 33)
  • Unknown: "The Communicator" (ENT 34)
  • August 14: "Singularity" (ENT 35)
  • Unknown: "Vanishing Point" (ENT 36)
  • September 12: "Precious Cargo" (ENT 37)
  • September 18: "The Catwalk" (ENT 38)
  • Unknown: "Dawn" (ENT 39)
  • Unknown: "Stigma" (ENT 40)
  • Unknown: "Cease Fire" (ENT 41)
  • Unknown: "Future Tense" (ENT 42)
  • Unknown: "Canamar" (ENT 43)
  • Unknown: "The Crossing" (ENT 44)

2153

• The Xindi attack Earth. ("The Expanse" ENT 52)

• Season Two of Enterprise (2152-2153)
  • Unknown: "Judgment" (ENT 45)
  • Unknown: "Horizon" (ENT 46)
  • Unknown: "The Breach" (ENT 47)
  • Unknown: "Cogenitor" (ENT 48)
  • March 1: "Regeneration" (ENT 49)
  • Unknown: "First Flight" (ENT 50)
  • March 21: "Bounty" (ENT 51)
  • April 24: "The Expanse" (ENT 52)

• Season Three of Star Trek: Enterprise (2153-2154)
  • Unknown: "The Xindi" (ENT 53)
  • Unknown: "Anomaly" (ENT 54)
  • Unknown: "Extinction" (ENT 55)
  • Unknown: "Rajiin" (ENT 56)
  • Unknown: "Impulse" (ENT 57)
  • Unknown: "Exile" (ENT 58)
  • Unknown: "The Shipment" (ENT 59)
  • Unknown: "Twilight" (ENT 60)
  • Unknown: "North Star" (ENT 61)
  • Unknown: "Similitude" (ENT 62)
  • Unknown: "Carpenter Street" (ENT 63)
  • Unknown: "Chosen Realm" (ENT 64)
  • December 6: "Proving Ground" (ENT 65)
  • December 12: "Stratagem" (ENT 66)
  • December 27: "Harbinger" (ENT 67)

2154

• Season Three of Star Trek: Enterprise (2153-2154)
  • Unknown: "Doctor's Orders" (ENT 68)
  • January 8: "Hatchery" (ENT 69)
  • Unknown: "Azati Prime" (ENT 70)
  • Unknown: "Damage" (ENT 71)
  • Unknown: "The Forgotten" (ENT 72)
  • Unknown: "E²" (ENT 73)
  • Unknown: "The Council" (ENT 74)
  • February 13: "Countdown" (ENT 75)
  • February 14: "Zero Hour" (ENT 76)

• Season Four of Star Trek: Enterprise (2154-2155)
  • Unknown: "Storm Front, Part I" (ENT 77)
  • Unknown: "Storm Front, Part II" (ENT 78)
  • Unknown: "Home" (ENT 79)
  • May 17: "Borderland" (ENT 80)
  • Unknown: "Cold Station 12" (ENT 81)
  • May 27: "The Augments" (ENT 82)
  • Unknown: "The Forge" (ENT 83)
  • Unknown: "Awakening" (ENT 84)
  • Unknown: "Kir'Shara" (ENT 85)
  • Unknown: "Daedalus" (ENT 86)
  • Unknown: "Observer Effect" (ENT 87)
  • November 12: "Babel One" (ENT 88)
  • Unknown: "United" (ENT 89)
  • Unknown: "The Aenar" (ENT 90)
  • November 27: "Affliction" (ENT 91)
  • Unknown: "Divergence" (ENT 92)
  • December 27: "Bound" (ENT 93)

2155

• Season Four of Star Trek: Enterprise (2154-2155)
  • January 13: "In a Mirror, Darkly, Part I" (ENT 94)
  • Unknown: "In a Mirror, Darkly, Part II" (ENT 95)
  • January 19: "Demons" (ENT 96)
  • January 20: "Terra Prime" (ENT 97)

2161

• The Romulan War ends. ("Balance of Terror" TOS 08)

• The United Federation of Planets is formed. (Star Trek: Generations, "These Are the Voyages..." ENT 98)

• The Enterprise NX-01 is retired. "These Are the Voyages..." ENT 98)

• Season Four of Star Trek: Enterprise (2154-2155)
  • Unknown: "These Are the Voyages..." (ENT 98)