South Dakota trails · Snow-2K
Snow-2K
A 16.7-mile out-and-back in South Dakota, with 678 ft of climbing. Reaches Irey Spring. Managed by the U.S. Forest Service.
Elevation profile
Most of the climbing sits in the final third — 57% of the ascent, between mile 11.1 and mile 16.7. It gives back about 812 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Reaches
- Irey Spring (spring)
Getting there
SNOW-2K access. About 1 h 30 min drive (53 mi, 6 of them unpaved) from Rapid City. 44.11018, -103.89407 · directions
Daylight at the trailhead
On October 14, 2026 — the day this page was generated — first light reaches this trailhead at 6:39 a.m., the sun rises at 7:08 a.m. and sets at 6:13 p.m., and the last usable light fades about 6:42 p.m. (MDT) — 11 h 05 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 33.4-mile round trip works out to roughly 13 h 04 min of walking — more than a single day of daylight here, so plan it as an overnight or hike it in sections.
Nearby trails
- Snow-5 — 5.6 mi
- Snow-2 — 7.3 mi
- Deerfield Lake Loop — 7.3 mi
- Eagle Cliff Bratwurst — 8.7 mi