The Iron Spring Trail is located is southeast Montana, in Custer Gallatin National Forest. This place is extremely remote and doesn’t get much credit for its dozens of miles of trail. The hills in this part of the state are just high enough to receive more rain than the surrounding grasslands, and as a result have some beautiful pine forests.

The easiest of the three Tararua S-K routes starts at Putara Road end goes via Roaring Stag Hut - Raumahunga River - Cow Saddle - Mitre Flats Hut - Atiwhakatu Hut -up the River Ridge - Totara Flats Hut - Cone Saddle - Cone Hut - Smiths Creek - Puffer Track and finishes at Kaitoke (Kiwi Ranch Road).

This is the northernmost section of the Appalachian trail in Pennsylvania, with termini at two of the most popular trailheads in the state due to their proximity to mail drops and resupply areas: the southern terminus is the Port Clinton trailhead parking lot and the northern terminus is the gate to the Mt. Minsi trailhead parking lot (located at the Delaware Water Gap).