Interstate 25

Fact Box

Interstate 25
File:Interstate 25 map.png
Length-1,063 miles
South end- Las Cruces, NM
North end- Buffalo, WY
States Served- NM, CO, WY
Interstate 25 (I-25) is a major Interstate Highway in the western United States. It is primarily a north–south highway. I-25 stretches from Interstate 10 at Las Cruces, New Mexico (approximately 25 miles (40 km) north ofEl Paso, Texas), to Interstate 90 in Buffalo, Wyoming (approximately 60 miles (97 km) south of theMontana/Wyoming border).

Interstate 25 is the main north–south expressway through WyomingColorado, and New Mexico. From north to south, it passes through or near Casper, WyomingCheyenne, WyomingFort Collins, ColoradoDenver, Colorado; Colorado Springs, ColoradoPueblo, ColoradoRaton, New MexicoLas Vegas, New MexicoSanta Fe, New MexicoAlbuquerque, New MexicoSocorro, New MexicoTruth or Consequences, New Mexico andLas Cruces, New Mexico. The I-25 corridor is mainly rural, especially in Wyoming, excluding the Albuquerque, Pueblo, Colorado Springs, and the Denver areas. The part of I-25 in Colorado passes just east of the Front Range of the Rocky Mountains. That stretch was recently involved in a large-scale renovation named the T-REX (TRansportation EXpansion) in Denver, and the COSMIX (Colorado Springs Metropolitan Interstate Expansion). These projects and others in New Mexico were necessary because these stretches of I-25 were inadequately designed and constructed originally (the pavement was deteriorating rapidly), and also because urban areas like Denver, Colorado Springs, and Albuquerque had tripled and quadrupled in population muchearlier than anyone had anticipated back in the 1950s and 1960s. Major highway work for the T-REX project ended on August 22, 2006. The COSMIX project was completed in December 2007. Several other smaller improvement projects for I-25 are still ongoing within Colorado and New Mexico.


Major intersections

New Mexico

  • I‑10 / US 85 / US 180 in Las Cruces; they travel concurrently until they split in Fountain, Colorado.
  • US 70 in Las Cruces
  • US 380 near San Antonio, NM
  • US 60 in Socorro; they travel concurrently until they split in Bernardo.
  • I‑40 in Albuquerque
  • US 550 / NM 165 in Bernalillo
  • US 84 / US 285 near Santa Fe; US 285 travels concurrently with I-25 until they split in Eldorado at Santa Fe; US 84 travels concurrently with I-25 until they split in Romeroville.
  • US 64 near Raton; they travel concurrently until they split in Raton.
  • US 64 / US 87 in Raton


  • US 160 in Trinidad; they travel concurrently until they split in Walsenburg.
  • US 50 in Pueblo; they travel concurrently for approximately 1.5 miles (2.4 km).
  • US 24 in Colorado Springs; they travel concurrently for approximately 2 miles (3.2 km).
  • US 85 in Colorado Springs; they travel concurrently until they split in Castle Rock.
  • SH 470 / E-470 in Lone Tree
  • I‑225 in Denver
  • US 285 / SH 30 in Denver
  • US 85 in Denver
  • US 6 in Denver
  • I‑70 Bus. / US 40 / US 287 in Denver
  • I‑70 / US 6 / US 85 in Denver
  • I‑76 near North Washington
  • I‑270 / US 36 at Welby
  • E-470/Northwest Parkway in BroomfieldThornton
  • US 34 in Loveland


  • I-80 near Cheyenne
  • I-80 Bus. / US 30 in Cheyenne
  • I-25 Bus. / US 85 / US 87 Bus. in Cheyenne; US 85 travels concurrent with I-25 until they split in Ranchettes.
  • US 26 near Wheatland; they travel concurrently until they split near Glenrock.
  • US 18 / US 20 in Orin; US 20 travels concurrently with I-25 until they split near Glenrock.
  • I-25 Bus. / US 20 Bus. / US 26 Bus. / US 87 Bus. / US 20 / US 26 in Casper; US 20/US 26 travel concurrent with I-25 until they split inHartrandt.
  • I-90 Bus. / US 16 in Buffalo
  • I-90 / US 87 near Buffalo

Auxiliary routes

  • Business routes of Interstate 25
  • Interstate 225