Continuing 'northbound' at Santa Fe, I-25 heads southeast for approximately traveling through the Santa Fe National Forest and crossing Glorieta Pass (). It turns north again at Blanchard toward Las Vegas. The highway maintains a north and northeast orientation as it leaves New Mexico traversing Raton Pass () and enters Colorado. The speed limit through Raton Pass is . From Santa Fe to Raton Pass I-25 approximates part of the route of the Santa Fe Trail. I-25 is long in New Mexico.